/*
 * Copyright 2012-15 Advanced Micro Devices, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Authors: AMD
 *
 */

#include <linux/slab.h>

#include "dm_services.h"
#include "atomfirmware.h"
#include "dm_helpers.h"
#include "dc.h"
#include "grph_object_id.h"
#include "gpio_service_interface.h"
#include "core_status.h"
#include "dc_link_dp.h"
#include "dc_link_dpia.h"
#include "dc_link_ddc.h"
#include "link_hwss.h"
#include "opp.h"

#include "link_encoder.h"
#include "hw_sequencer.h"
#include "resource.h"
#include "abm.h"
#include "fixed31_32.h"
#include "dpcd_defs.h"
#include "dmcu.h"
#include "hw/clk_mgr.h"
#include "dce/dmub_psr.h"
#include "dmub/dmub_srv.h"
#include "inc/hw/panel_cntl.h"
#include "inc/link_enc_cfg.h"
#include "inc/link_dpcd.h"
#include "link/link_dp_trace.h"

#include "dc/dcn30/dcn30_vpg.h"

#define DC_LOGGER_INIT(logger)

#define LINK_INFO(...) \
	DC_LOG_HW_HOTPLUG(  \
		__VA_ARGS__)

#define RETIMER_REDRIVER_INFO(...) \
	DC_LOG_RETIMER_REDRIVER(  \
		__VA_ARGS__)

/*******************************************************************************
 * Private functions
 ******************************************************************************/
static void dc_link_destruct(struct dc_link *link)
{
	int i;

	if (link->hpd_gpio) {
		dal_gpio_destroy_irq(&link->hpd_gpio);
		link->hpd_gpio = NULL;
	}

	if (link->ddc)
		dal_ddc_service_destroy(&link->ddc);

	if (link->panel_cntl)
		link->panel_cntl->funcs->destroy(&link->panel_cntl);

	if (link->link_enc) {
		/* Update link encoder resource tracking variables. These are used for
		 * the dynamic assignment of link encoders to streams. Virtual links
		 * are not assigned encoder resources on creation.
		 */
		if (link->link_id.id != CONNECTOR_ID_VIRTUAL) {
			link->dc->res_pool->link_encoders[link->eng_id - ENGINE_ID_DIGA] = NULL;
			link->dc->res_pool->dig_link_enc_count--;
		}
		link->link_enc->funcs->destroy(&link->link_enc);
	}

	if (link->local_sink)
		dc_sink_release(link->local_sink);

	for (i = 0; i < link->sink_count; ++i)
		dc_sink_release(link->remote_sinks[i]);
}

struct gpio *get_hpd_gpio(struct dc_bios *dcb,
			  struct graphics_object_id link_id,
			  struct gpio_service *gpio_service)
{
	enum bp_result bp_result;
	struct graphics_object_hpd_info hpd_info;
	struct gpio_pin_info pin_info;

	if (dcb->funcs->get_hpd_info(dcb, link_id, &hpd_info) != BP_RESULT_OK)
		return NULL;

	bp_result = dcb->funcs->get_gpio_pin_info(dcb,
		hpd_info.hpd_int_gpio_uid, &pin_info);

	if (bp_result != BP_RESULT_OK) {
		ASSERT(bp_result == BP_RESULT_NORECORD);
		return NULL;
	}

	return dal_gpio_service_create_irq(gpio_service,
					   pin_info.offset,
					   pin_info.mask);
}

/*
 *  Function: program_hpd_filter
 *
 *  @brief
 *     Programs HPD filter on associated HPD line
 *
 *  @param [in] delay_on_connect_in_ms: Connect filter timeout
 *  @param [in] delay_on_disconnect_in_ms: Disconnect filter timeout
 *
 *  @return
 *     true on success, false otherwise
 */
static bool program_hpd_filter(const struct dc_link *link)
{
	bool result = false;
	struct gpio *hpd;
	int delay_on_connect_in_ms = 0;
	int delay_on_disconnect_in_ms = 0;

	if (link->is_hpd_filter_disabled)
		return false;
	/* Verify feature is supported */
	switch (link->connector_signal) {
	case SIGNAL_TYPE_DVI_SINGLE_LINK:
	case SIGNAL_TYPE_DVI_DUAL_LINK:
	case SIGNAL_TYPE_HDMI_TYPE_A:
		/* Program hpd filter */
		delay_on_connect_in_ms = 500;
		delay_on_disconnect_in_ms = 100;
		break;
	case SIGNAL_TYPE_DISPLAY_PORT:
	case SIGNAL_TYPE_DISPLAY_PORT_MST:
		/* Program hpd filter to allow DP signal to settle */
		/* 500:	not able to detect MST <-> SST switch as HPD is low for
		 * only 100ms on DELL U2413
		 * 0: some passive dongle still show aux mode instead of i2c
		 * 20-50: not enough to hide bouncing HPD with passive dongle.
		 * also see intermittent i2c read issues.
		 */
		delay_on_connect_in_ms = 80;
		delay_on_disconnect_in_ms = 0;
		break;
	case SIGNAL_TYPE_LVDS:
	case SIGNAL_TYPE_EDP:
	default:
		/* Don't program hpd filter */
		return false;
	}

	/* Obtain HPD handle */
	hpd = get_hpd_gpio(link->ctx->dc_bios, link->link_id,
			   link->ctx->gpio_service);

	if (!hpd)
		return result;

	/* Setup HPD filtering */
	if (dal_gpio_open(hpd, GPIO_MODE_INTERRUPT) == GPIO_RESULT_OK) {
		struct gpio_hpd_config config;

		config.delay_on_connect = delay_on_connect_in_ms;
		config.delay_on_disconnect = delay_on_disconnect_in_ms;

		dal_irq_setup_hpd_filter(hpd, &config);

		dal_gpio_close(hpd);

		result = true;
	} else {
		ASSERT_CRITICAL(false);
	}

	/* Release HPD handle */
	dal_gpio_destroy_irq(&hpd);

	return result;
}

bool dc_link_wait_for_t12(struct dc_link *link)
{
	if (link->connector_signal == SIGNAL_TYPE_EDP && link->dc->hwss.edp_wait_for_T12) {
		link->dc->hwss.edp_wait_for_T12(link);

		return true;
	}

	return false;
}

/**
 * dc_link_detect_sink() - Determine if there is a sink connected
 *
 * @link: pointer to the dc link
 * @type: Returned connection type
 * Does not detect downstream devices, such as MST sinks
 * or display connected through active dongles
 */
bool dc_link_detect_sink(struct dc_link *link, enum dc_connection_type *type)
{
	uint32_t is_hpd_high = 0;
	struct gpio *hpd_pin;

	if (link->connector_signal == SIGNAL_TYPE_LVDS) {
		*type = dc_connection_single;
		return true;
	}

	if (link->connector_signal == SIGNAL_TYPE_EDP) {
		/*in case it is not on*/
		if (!link->dc->config.edp_no_power_sequencing)
			link->dc->hwss.edp_power_control(link, true);
		link->dc->hwss.edp_wait_for_hpd_ready(link, true);
	}

	/* Link may not have physical HPD pin. */
	if (link->ep_type != DISPLAY_ENDPOINT_PHY) {
		if (link->is_hpd_pending || !dc_link_dpia_query_hpd_status(link))
			*type = dc_connection_none;
		else
			*type = dc_connection_single;

		return true;
	}

	/* todo: may need to lock gpio access */
	hpd_pin = get_hpd_gpio(link->ctx->dc_bios, link->link_id,
			       link->ctx->gpio_service);
	if (!hpd_pin)
		goto hpd_gpio_failure;

	dal_gpio_open(hpd_pin, GPIO_MODE_INTERRUPT);
	dal_gpio_get_value(hpd_pin, &is_hpd_high);
	dal_gpio_close(hpd_pin);
	dal_gpio_destroy_irq(&hpd_pin);

	if (is_hpd_high) {
		*type = dc_connection_single;
		/* TODO: need to do the actual detection */
	} else {
		*type = dc_connection_none;
	}

	return true;

hpd_gpio_failure:
	return false;
}

static enum ddc_transaction_type get_ddc_transaction_type(enum signal_type sink_signal)
{
	enum ddc_transaction_type transaction_type = DDC_TRANSACTION_TYPE_NONE;

	switch (sink_signal) {
	case SIGNAL_TYPE_DVI_SINGLE_LINK:
	case SIGNAL_TYPE_DVI_DUAL_LINK:
	case SIGNAL_TYPE_HDMI_TYPE_A:
	case SIGNAL_TYPE_LVDS:
	case SIGNAL_TYPE_RGB:
		transaction_type = DDC_TRANSACTION_TYPE_I2C;
		break;

	case SIGNAL_TYPE_DISPLAY_PORT:
	case SIGNAL_TYPE_EDP:
		transaction_type = DDC_TRANSACTION_TYPE_I2C_OVER_AUX;
		break;

	case SIGNAL_TYPE_DISPLAY_PORT_MST:
		/* MST does not use I2COverAux, but there is the
		 * SPECIAL use case for "immediate dwnstrm device
		 * access" (EPR#370830).
		 */
		transaction_type = DDC_TRANSACTION_TYPE_I2C_OVER_AUX;
		break;

	default:
		break;
	}

	return transaction_type;
}

static enum signal_type get_basic_signal_type(struct graphics_object_id encoder,
					      struct graphics_object_id downstream)
{
	if (downstream.type == OBJECT_TYPE_CONNECTOR) {
		switch (downstream.id) {
		case CONNECTOR_ID_SINGLE_LINK_DVII:
			switch (encoder.id) {
			case ENCODER_ID_INTERNAL_DAC1:
			case ENCODER_ID_INTERNAL_KLDSCP_DAC1:
			case ENCODER_ID_INTERNAL_DAC2:
			case ENCODER_ID_INTERNAL_KLDSCP_DAC2:
				return SIGNAL_TYPE_RGB;
			default:
				return SIGNAL_TYPE_DVI_SINGLE_LINK;
			}
		break;
		case CONNECTOR_ID_DUAL_LINK_DVII:
		{
			switch (encoder.id) {
			case ENCODER_ID_INTERNAL_DAC1:
			case ENCODER_ID_INTERNAL_KLDSCP_DAC1:
			case ENCODER_ID_INTERNAL_DAC2:
			case ENCODER_ID_INTERNAL_KLDSCP_DAC2:
				return SIGNAL_TYPE_RGB;
			default:
				return SIGNAL_TYPE_DVI_DUAL_LINK;
			}
		}
		break;
		case CONNECTOR_ID_SINGLE_LINK_DVID:
			return SIGNAL_TYPE_DVI_SINGLE_LINK;
		case CONNECTOR_ID_DUAL_LINK_DVID:
			return SIGNAL_TYPE_DVI_DUAL_LINK;
		case CONNECTOR_ID_VGA:
			return SIGNAL_TYPE_RGB;
		case CONNECTOR_ID_HDMI_TYPE_A:
			return SIGNAL_TYPE_HDMI_TYPE_A;
		case CONNECTOR_ID_LVDS:
			return SIGNAL_TYPE_LVDS;
		case CONNECTOR_ID_DISPLAY_PORT:
		case CONNECTOR_ID_USBC:
			return SIGNAL_TYPE_DISPLAY_PORT;
		case CONNECTOR_ID_EDP:
			return SIGNAL_TYPE_EDP;
		default:
			return SIGNAL_TYPE_NONE;
		}
	} else if (downstream.type == OBJECT_TYPE_ENCODER) {
		switch (downstream.id) {
		case ENCODER_ID_EXTERNAL_NUTMEG:
		case ENCODER_ID_EXTERNAL_TRAVIS:
			return SIGNAL_TYPE_DISPLAY_PORT;
		default:
			return SIGNAL_TYPE_NONE;
		}
	}

	return SIGNAL_TYPE_NONE;
}

/*
 * dc_link_is_dp_sink_present() - Check if there is a native DP
 * or passive DP-HDMI dongle connected
 */
bool dc_link_is_dp_sink_present(struct dc_link *link)
{
	enum gpio_result gpio_result;
	uint32_t clock_pin = 0;
	uint8_t retry = 0;
	struct ddc *ddc;

	enum connector_id connector_id =
		dal_graphics_object_id_get_connector_id(link->link_id);

	bool present =
		((connector_id == CONNECTOR_ID_DISPLAY_PORT) ||
		(connector_id == CONNECTOR_ID_EDP) ||
		(connector_id == CONNECTOR_ID_USBC));

	ddc = dal_ddc_service_get_ddc_pin(link->ddc);

	if (!ddc) {
		BREAK_TO_DEBUGGER();
		return present;
	}

	/* Open GPIO and set it to I2C mode */
	/* Note: this GpioMode_Input will be converted
	 * to GpioConfigType_I2cAuxDualMode in GPIO component,
	 * which indicates we need additional delay
	 */

	if (dal_ddc_open(ddc, GPIO_MODE_INPUT,
			 GPIO_DDC_CONFIG_TYPE_MODE_I2C) != GPIO_RESULT_OK) {
		dal_ddc_close(ddc);

		return present;
	}

	/*
	 * Read GPIO: DP sink is present if both clock and data pins are zero
	 *
	 * [W/A] plug-unplug DP cable, sometimes customer board has
	 * one short pulse on clk_pin(1V, < 1ms). DP will be config to HDMI/DVI
	 * then monitor can't br light up. Add retry 3 times
	 * But in real passive dongle, it need additional 3ms to detect
	 */
	do {
		gpio_result = dal_gpio_get_value(ddc->pin_clock, &clock_pin);
		ASSERT(gpio_result == GPIO_RESULT_OK);
		if (clock_pin)
			udelay(1000);
		else
			break;
	} while (retry++ < 3);

	present = (gpio_result == GPIO_RESULT_OK) && !clock_pin;

	dal_ddc_close(ddc);

	return present;
}

/*
 * @brief
 * Detect output sink type
 */
static enum signal_type link_detect_sink(struct dc_link *link,
					 enum dc_detect_reason reason)
{
	enum signal_type result;
	struct graphics_object_id enc_id;

	if (link->is_dig_mapping_flexible)
		enc_id = (struct graphics_object_id){.id = ENCODER_ID_UNKNOWN};
	else
		enc_id = link->link_enc->id;
	result = get_basic_signal_type(enc_id, link->link_id);

	/* Use basic signal type for link without physical connector. */
	if (link->ep_type != DISPLAY_ENDPOINT_PHY)
		return result;

	/* Internal digital encoder will detect only dongles
	 * that require digital signal
	 */

	/* Detection mechanism is different
	 * for different native connectors.
	 * LVDS connector supports only LVDS signal;
	 * PCIE is a bus slot, the actual connector needs to be detected first;
	 * eDP connector supports only eDP signal;
	 * HDMI should check straps for audio
	 */

	/* PCIE detects the actual connector on add-on board */
	if (link->link_id.id == CONNECTOR_ID_PCIE) {
		/* ZAZTODO implement PCIE add-on card detection */
	}

	switch (link->link_id.id) {
	case CONNECTOR_ID_HDMI_TYPE_A: {
		/* check audio support:
		 * if native HDMI is not supported, switch to DVI
		 */
		struct audio_support *aud_support =
					&link->dc->res_pool->audio_support;

		if (!aud_support->hdmi_audio_native)
			if (link->link_id.id == CONNECTOR_ID_HDMI_TYPE_A)
				result = SIGNAL_TYPE_DVI_SINGLE_LINK;
	}
	break;
	case CONNECTOR_ID_DISPLAY_PORT:
	case CONNECTOR_ID_USBC: {
		/* DP HPD short pulse. Passive DP dongle will not
		 * have short pulse
		 */
		if (reason != DETECT_REASON_HPDRX) {
			/* Check whether DP signal detected: if not -
			 * we assume signal is DVI; it could be corrected
			 * to HDMI after dongle detection
			 */
			if (!dm_helpers_is_dp_sink_present(link))
				result = SIGNAL_TYPE_DVI_SINGLE_LINK;
		}
	}
	break;
	default:
	break;
	}

	return result;
}

static enum signal_type decide_signal_from_strap_and_dongle_type(enum display_dongle_type dongle_type,
								 struct audio_support *audio_support)
{
	enum signal_type signal = SIGNAL_TYPE_NONE;

	switch (dongle_type) {
	case DISPLAY_DONGLE_DP_HDMI_DONGLE:
		if (audio_support->hdmi_audio_on_dongle)
			signal = SIGNAL_TYPE_HDMI_TYPE_A;
		else
			signal = SIGNAL_TYPE_DVI_SINGLE_LINK;
		break;
	case DISPLAY_DONGLE_DP_DVI_DONGLE:
		signal = SIGNAL_TYPE_DVI_SINGLE_LINK;
		break;
	case DISPLAY_DONGLE_DP_HDMI_MISMATCHED_DONGLE:
		if (audio_support->hdmi_audio_native)
			signal =  SIGNAL_TYPE_HDMI_TYPE_A;
		else
			signal = SIGNAL_TYPE_DVI_SINGLE_LINK;
		break;
	default:
		signal = SIGNAL_TYPE_NONE;
		break;
	}

	return signal;
}

static enum signal_type dp_passive_dongle_detection(struct ddc_service *ddc,
						    struct display_sink_capability *sink_cap,
						    struct audio_support *audio_support)
{
	dal_ddc_service_i2c_query_dp_dual_mode_adaptor(ddc, sink_cap);

	return decide_signal_from_strap_and_dongle_type(sink_cap->dongle_type,
							audio_support);
}

static void link_disconnect_sink(struct dc_link *link)
{
	if (link->local_sink) {
		dc_sink_release(link->local_sink);
		link->local_sink = NULL;
	}

	link->dpcd_sink_count = 0;
	//link->dpcd_caps.dpcd_rev.raw = 0;
}

static void link_disconnect_remap(struct dc_sink *prev_sink, struct dc_link *link)
{
	dc_sink_release(link->local_sink);
	link->local_sink = prev_sink;
}

#if defined(CONFIG_DRM_AMD_DC_HDCP)
bool dc_link_is_hdcp14(struct dc_link *link, enum signal_type signal)
{
	bool ret = false;

	switch (signal)	{
	case SIGNAL_TYPE_DISPLAY_PORT:
	case SIGNAL_TYPE_DISPLAY_PORT_MST:
		ret = link->hdcp_caps.bcaps.bits.HDCP_CAPABLE;
		break;
	case SIGNAL_TYPE_DVI_SINGLE_LINK:
	case SIGNAL_TYPE_DVI_DUAL_LINK:
	case SIGNAL_TYPE_HDMI_TYPE_A:
	/* HDMI doesn't tell us its HDCP(1.4) capability, so assume to always be capable,
	 * we can poll for bksv but some displays have an issue with this. Since its so rare
	 * for a display to not be 1.4 capable, this assumtion is ok
	 */
		ret = true;
		break;
	default:
		break;
	}
	return ret;
}

bool dc_link_is_hdcp22(struct dc_link *link, enum signal_type signal)
{
	bool ret = false;

	switch (signal)	{
	case SIGNAL_TYPE_DISPLAY_PORT:
	case SIGNAL_TYPE_DISPLAY_PORT_MST:
		ret = (link->hdcp_caps.bcaps.bits.HDCP_CAPABLE &&
				link->hdcp_caps.rx_caps.fields.byte0.hdcp_capable &&
				(link->hdcp_caps.rx_caps.fields.version == 0x2)) ? 1 : 0;
		break;
	case SIGNAL_TYPE_DVI_SINGLE_LINK:
	case SIGNAL_TYPE_DVI_DUAL_LINK:
	case SIGNAL_TYPE_HDMI_TYPE_A:
		ret = (link->hdcp_caps.rx_caps.fields.version == 0x4) ? 1:0;
		break;
	default:
		break;
	}

	return ret;
}

static void query_hdcp_capability(enum signal_type signal, struct dc_link *link)
{
	struct hdcp_protection_message msg22;
	struct hdcp_protection_message msg14;

	memset(&msg22, 0, sizeof(struct hdcp_protection_message));
	memset(&msg14, 0, sizeof(struct hdcp_protection_message));
	memset(link->hdcp_caps.rx_caps.raw, 0,
		sizeof(link->hdcp_caps.rx_caps.raw));

	if ((link->connector_signal == SIGNAL_TYPE_DISPLAY_PORT &&
			link->ddc->transaction_type ==
			DDC_TRANSACTION_TYPE_I2C_OVER_AUX) ||
			link->connector_signal == SIGNAL_TYPE_EDP) {
		msg22.data = link->hdcp_caps.rx_caps.raw;
		msg22.length = sizeof(link->hdcp_caps.rx_caps.raw);
		msg22.msg_id = HDCP_MESSAGE_ID_RX_CAPS;
	} else {
		msg22.data = &link->hdcp_caps.rx_caps.fields.version;
		msg22.length = sizeof(link->hdcp_caps.rx_caps.fields.version);
		msg22.msg_id = HDCP_MESSAGE_ID_HDCP2VERSION;
	}
	msg22.version = HDCP_VERSION_22;
	msg22.link = HDCP_LINK_PRIMARY;
	msg22.max_retries = 5;
	dc_process_hdcp_msg(signal, link, &msg22);

	if (signal == SIGNAL_TYPE_DISPLAY_PORT || signal == SIGNAL_TYPE_DISPLAY_PORT_MST) {
		msg14.data = &link->hdcp_caps.bcaps.raw;
		msg14.length = sizeof(link->hdcp_caps.bcaps.raw);
		msg14.msg_id = HDCP_MESSAGE_ID_READ_BCAPS;
		msg14.version = HDCP_VERSION_14;
		msg14.link = HDCP_LINK_PRIMARY;
		msg14.max_retries = 5;

		dc_process_hdcp_msg(signal, link, &msg14);
	}

}
#endif

static void read_current_link_settings_on_detect(struct dc_link *link)
{
	union lane_count_set lane_count_set = {0};
	uint8_t link_bw_set;
	uint8_t link_rate_set;
	uint32_t read_dpcd_retry_cnt = 10;
	enum dc_status status = DC_ERROR_UNEXPECTED;
	int i;
	union max_down_spread max_down_spread = {0};

	// Read DPCD 00101h to find out the number of lanes currently set
	for (i = 0; i < read_dpcd_retry_cnt; i++) {
		status = core_link_read_dpcd(link,
					     DP_LANE_COUNT_SET,
					     &lane_count_set.raw,
					     sizeof(lane_count_set));
		/* First DPCD read after VDD ON can fail if the particular board
		 * does not have HPD pin wired correctly. So if DPCD read fails,
		 * which it should never happen, retry a few times. Target worst
		 * case scenario of 80 ms.
		 */
		if (status == DC_OK) {
			link->cur_link_settings.lane_count =
					lane_count_set.bits.LANE_COUNT_SET;
			break;
		}

		msleep(8);
	}

	// Read DPCD 00100h to find if standard link rates are set
	core_link_read_dpcd(link, DP_LINK_BW_SET,
			    &link_bw_set, sizeof(link_bw_set));

	if (link_bw_set == 0) {
		if (link->connector_signal == SIGNAL_TYPE_EDP) {
			/* If standard link rates are not being used,
			 * Read DPCD 00115h to find the edp link rate set used
			 */
			core_link_read_dpcd(link, DP_LINK_RATE_SET,
					    &link_rate_set, sizeof(link_rate_set));

			// edp_supported_link_rates_count = 0 for DP
			if (link_rate_set < link->dpcd_caps.edp_supported_link_rates_count) {
				link->cur_link_settings.link_rate =
					link->dpcd_caps.edp_supported_link_rates[link_rate_set];
				link->cur_link_settings.link_rate_set = link_rate_set;
				link->cur_link_settings.use_link_rate_set = true;
			}
		} else {
			// Link Rate not found. Seamless boot may not work.
			ASSERT(false);
		}
	} else {
		link->cur_link_settings.link_rate = link_bw_set;
		link->cur_link_settings.use_link_rate_set = false;
	}
	// Read DPCD 00003h to find the max down spread.
	core_link_read_dpcd(link, DP_MAX_DOWNSPREAD,
			    &max_down_spread.raw, sizeof(max_down_spread));
	link->cur_link_settings.link_spread =
		max_down_spread.bits.MAX_DOWN_SPREAD ?
		LINK_SPREAD_05_DOWNSPREAD_30KHZ : LINK_SPREAD_DISABLED;
}

static bool detect_dp(struct dc_link *link,
		      struct display_sink_capability *sink_caps,
		      enum dc_detect_reason reason)
{
	struct audio_support *audio_support = &link->dc->res_pool->audio_support;

	sink_caps->signal = link_detect_sink(link, reason);
	sink_caps->transaction_type =
		get_ddc_transaction_type(sink_caps->signal);

	if (sink_caps->transaction_type == DDC_TRANSACTION_TYPE_I2C_OVER_AUX) {
		sink_caps->signal = SIGNAL_TYPE_DISPLAY_PORT;
		if (!detect_dp_sink_caps(link))
			return false;

		if (is_dp_branch_device(link))
			/* DP SST branch */
			link->type = dc_connection_sst_branch;
	} else {
		/* DP passive dongles */
		sink_caps->signal = dp_passive_dongle_detection(link->ddc,
								sink_caps,
								audio_support);
		link->dpcd_caps.dongle_type = sink_caps->dongle_type;
		link->dpcd_caps.is_dongle_type_one = sink_caps->is_dongle_type_one;
		link->dpcd_caps.dpcd_rev.raw = 0;
	}

	return true;
}

static bool is_same_edid(struct dc_edid *old_edid, struct dc_edid *new_edid)
{
	if (old_edid->length != new_edid->length)
		return false;

	if (new_edid->length == 0)
		return false;

	return (memcmp(old_edid->raw_edid,
		       new_edid->raw_edid, new_edid->length) == 0);
}

static bool wait_for_entering_dp_alt_mode(struct dc_link *link)
{
	/**
	 * something is terribly wrong if time out is > 200ms. (5Hz)
	 * 500 microseconds * 400 tries us 200 ms
	 **/
	unsigned int sleep_time_in_microseconds = 500;
	unsigned int tries_allowed = 400;
	bool is_in_alt_mode;
	unsigned long long enter_timestamp;
	unsigned long long finish_timestamp;
	unsigned long long time_taken_in_ns;
	int tries_taken;

	DC_LOGGER_INIT(link->ctx->logger);

	if (!link->link_enc->funcs->is_in_alt_mode)
		return true;

	is_in_alt_mode = link->link_enc->funcs->is_in_alt_mode(link->link_enc);
	DC_LOG_WARNING("DP Alt mode state on HPD: %d\n", is_in_alt_mode);

	if (is_in_alt_mode)
		return true;

	enter_timestamp = dm_get_timestamp(link->ctx);

	for (tries_taken = 0; tries_taken < tries_allowed; tries_taken++) {
		udelay(sleep_time_in_microseconds);
		/* ask the link if alt mode is enabled, if so return ok */
		if (link->link_enc->funcs->is_in_alt_mode(link->link_enc)) {
			finish_timestamp = dm_get_timestamp(link->ctx);
			time_taken_in_ns =
				dm_get_elapse_time_in_ns(link->ctx,
							 finish_timestamp,
							 enter_timestamp);
			DC_LOG_WARNING("Alt mode entered finished after %llu ms\n",
				       div_u64(time_taken_in_ns, 1000000));
			return true;
		}
	}
	finish_timestamp = dm_get_timestamp(link->ctx);
	time_taken_in_ns = dm_get_elapse_time_in_ns(link->ctx, finish_timestamp,
						    enter_timestamp);
	DC_LOG_WARNING("Alt mode has timed out after %llu ms\n",
		       div_u64(time_taken_in_ns, 1000000));
	return false;
}

static void apply_dpia_mst_dsc_always_on_wa(struct dc_link *link)
{
	/* Apply work around for tunneled MST on certain USB4 docks. Always use DSC if dock
	 * reports DSC support.
	 */
	if (link->ep_type == DISPLAY_ENDPOINT_USB4_DPIA &&
			link->type == dc_connection_mst_branch &&
			link->dpcd_caps.branch_dev_id == DP_BRANCH_DEVICE_ID_90CC24 &&
			link->dpcd_caps.branch_hw_revision == DP_BRANCH_HW_REV_20 &&
			link->dpcd_caps.dsc_caps.dsc_basic_caps.fields.dsc_support.DSC_SUPPORT &&
			!link->dc->debug.dpia_debug.bits.disable_mst_dsc_work_around)
		link->wa_flags.dpia_mst_dsc_always_on = true;
}

static void revert_dpia_mst_dsc_always_on_wa(struct dc_link *link)
{
	/* Disable work around which keeps DSC on for tunneled MST on certain USB4 docks. */
	if (link->ep_type == DISPLAY_ENDPOINT_USB4_DPIA)
		link->wa_flags.dpia_mst_dsc_always_on = false;
}

static bool discover_dp_mst_topology(struct dc_link *link, enum dc_detect_reason reason)
{
	DC_LOGGER_INIT(link->ctx->logger);

	LINK_INFO("link=%d, mst branch is now Connected\n",
		  link->link_index);

	link->type = dc_connection_mst_branch;
	apply_dpia_mst_dsc_always_on_wa(link);

	dm_helpers_dp_update_branch_info(link->ctx, link);
	if (dm_helpers_dp_mst_start_top_mgr(link->ctx,
			link, (reason == DETECT_REASON_BOOT || reason == DETECT_REASON_RESUMEFROMS3S4))) {
		link_disconnect_sink(link);
	} else {
		link->type = dc_connection_sst_branch;
	}

	return link->type == dc_connection_mst_branch;
}

bool reset_cur_dp_mst_topology(struct dc_link *link)
{
	DC_LOGGER_INIT(link->ctx->logger);

	LINK_INFO("link=%d, mst branch is now Disconnected\n",
		  link->link_index);

	revert_dpia_mst_dsc_always_on_wa(link);
	return dm_helpers_dp_mst_stop_top_mgr(link->ctx, link);
}

static bool should_prepare_phy_clocks_for_link_verification(const struct dc *dc,
		enum dc_detect_reason reason)
{
	int i;
	bool can_apply_seamless_boot = false;

	for (i = 0; i < dc->current_state->stream_count; i++) {
		if (dc->current_state->streams[i]->apply_seamless_boot_optimization) {
			can_apply_seamless_boot = true;
			break;
		}
	}

	return !can_apply_seamless_boot && reason != DETECT_REASON_BOOT;
}

static void prepare_phy_clocks_for_destructive_link_verification(const struct dc *dc)
{
	dc_z10_restore(dc);
	clk_mgr_exit_optimized_pwr_state(dc, dc->clk_mgr);
}

static void restore_phy_clocks_for_destructive_link_verification(const struct dc *dc)
{
	clk_mgr_optimize_pwr_state(dc, dc->clk_mgr);
}

static void set_all_streams_dpms_off_for_link(struct dc_link *link)
{
	int i;
	struct pipe_ctx *pipe_ctx;
	struct dc_stream_update stream_update;
	bool dpms_off = true;
	struct link_resource link_res = {0};

	memset(&stream_update, 0, sizeof(stream_update));
	stream_update.dpms_off = &dpms_off;

	for (i = 0; i < MAX_PIPES; i++) {
		pipe_ctx = &link->dc->current_state->res_ctx.pipe_ctx[i];
		if (pipe_ctx && pipe_ctx->stream && !pipe_ctx->stream->dpms_off &&
				pipe_ctx->stream->link == link && !pipe_ctx->prev_odm_pipe) {
			stream_update.stream = pipe_ctx->stream;
			dc_commit_updates_for_stream(link->ctx->dc, NULL, 0,
					pipe_ctx->stream, &stream_update,
					link->ctx->dc->current_state);
		}
	}

	/* link can be also enabled by vbios. In this case it is not recorded
	 * in pipe_ctx. Disable link phy here to make sure it is completely off
	 */
	dp_disable_link_phy(link, &link_res, link->connector_signal);
}

static void verify_link_capability_destructive(struct dc_link *link,
		struct dc_sink *sink,
		enum dc_detect_reason reason)
{
	bool should_prepare_phy_clocks =
			should_prepare_phy_clocks_for_link_verification(link->dc, reason);

	if (should_prepare_phy_clocks)
		prepare_phy_clocks_for_destructive_link_verification(link->dc);

	if (dc_is_dp_signal(link->local_sink->sink_signal)) {
		struct dc_link_settings known_limit_link_setting =
				dp_get_max_link_cap(link);
		set_all_streams_dpms_off_for_link(link);
		dp_verify_link_cap_with_retries(
				link, &known_limit_link_setting,
				LINK_TRAINING_MAX_VERIFY_RETRY);
	} else {
		ASSERT(0);
	}

	if (should_prepare_phy_clocks)
		restore_phy_clocks_for_destructive_link_verification(link->dc);
}

static void verify_link_capability_non_destructive(struct dc_link *link)
{
	if (dc_is_dp_signal(link->local_sink->sink_signal)) {
		if (dc_is_embedded_signal(link->local_sink->sink_signal) ||
				link->ep_type == DISPLAY_ENDPOINT_USB4_DPIA)
			/* TODO - should we check link encoder's max link caps here?
			 * How do we know which link encoder to check from?
			 */
			link->verified_link_cap = link->reported_link_cap;
		else
			link->verified_link_cap = dp_get_max_link_cap(link);
	}
}

static bool should_verify_link_capability_destructively(struct dc_link *link,
		enum dc_detect_reason reason)
{
	bool destrictive = false;
	struct dc_link_settings max_link_cap;
	bool is_link_enc_unavailable = link->link_enc &&
			link->dc->res_pool->funcs->link_encs_assign &&
			!link_enc_cfg_is_link_enc_avail(
					link->ctx->dc,
					link->link_enc->preferred_engine,
					link);

	if (dc_is_dp_signal(link->local_sink->sink_signal)) {
		max_link_cap = dp_get_max_link_cap(link);
		destrictive = true;

		if (link->dc->debug.skip_detection_link_training ||
				dc_is_embedded_signal(link->local_sink->sink_signal) ||
				link->ep_type == DISPLAY_ENDPOINT_USB4_DPIA) {
			destrictive = false;
		} else if (dp_get_link_encoding_format(&max_link_cap) ==
				DP_8b_10b_ENCODING) {
			if (link->dpcd_caps.is_mst_capable ||
					is_link_enc_unavailable) {
				destrictive = false;
			}
		}
	}

	return destrictive;
}

static void verify_link_capability(struct dc_link *link, struct dc_sink *sink,
		enum dc_detect_reason reason)
{
	if (should_verify_link_capability_destructively(link, reason))
		verify_link_capability_destructive(link, sink, reason);
	else
		verify_link_capability_non_destructive(link);
}


/**
 * detect_link_and_local_sink() - Detect if a sink is attached to a given link
 *
 * link->local_sink is created or destroyed as needed.
 *
 * This does not create remote sinks.
 */
static bool detect_link_and_local_sink(struct dc_link *link,
				  enum dc_detect_reason reason)
{
	struct dc_sink_init_data sink_init_data = { 0 };
	struct display_sink_capability sink_caps = { 0 };
	uint32_t i;
	bool converter_disable_audio = false;
	struct audio_support *aud_support = &link->dc->res_pool->audio_support;
	bool same_edid = false;
	enum dc_edid_status edid_status;
	struct dc_context *dc_ctx = link->ctx;
	struct dc *dc = dc_ctx->dc;
	struct dc_sink *sink = NULL;
	struct dc_sink *prev_sink = NULL;
	struct dpcd_caps prev_dpcd_caps;
	enum dc_connection_type new_connection_type = dc_connection_none;
	enum dc_connection_type pre_connection_type = link->type;
	const uint32_t post_oui_delay = 30; // 30ms

	DC_LOGGER_INIT(link->ctx->logger);

	if (dc_is_virtual_signal(link->connector_signal))
		return false;

	if (((link->connector_signal == SIGNAL_TYPE_LVDS ||
		link->connector_signal == SIGNAL_TYPE_EDP) &&
		(!link->dc->config.allow_edp_hotplug_detection)) &&
		link->local_sink) {
		// need to re-write OUI and brightness in resume case
		if (link->connector_signal == SIGNAL_TYPE_EDP &&
			(link->dpcd_sink_ext_caps.bits.oled == 1)) {
			dpcd_set_source_specific_data(link);
			msleep(post_oui_delay);
			dc_link_set_default_brightness_aux(link);
			//TODO: use cached
		}

		return true;
	}

	if (!dc_link_detect_sink(link, &new_connection_type)) {
		BREAK_TO_DEBUGGER();
		return false;
	}

	prev_sink = link->local_sink;
	if (prev_sink) {
		dc_sink_retain(prev_sink);
		memcpy(&prev_dpcd_caps, &link->dpcd_caps, sizeof(struct dpcd_caps));
	}

	link_disconnect_sink(link);
	if (new_connection_type != dc_connection_none) {
		link->type = new_connection_type;
		link->link_state_valid = false;

		/* From Disconnected-to-Connected. */
		switch (link->connector_signal) {
		case SIGNAL_TYPE_HDMI_TYPE_A: {
			sink_caps.transaction_type = DDC_TRANSACTION_TYPE_I2C;
			if (aud_support->hdmi_audio_native)
				sink_caps.signal = SIGNAL_TYPE_HDMI_TYPE_A;
			else
				sink_caps.signal = SIGNAL_TYPE_DVI_SINGLE_LINK;
			break;
		}

		case SIGNAL_TYPE_DVI_SINGLE_LINK: {
			sink_caps.transaction_type = DDC_TRANSACTION_TYPE_I2C;
			sink_caps.signal = SIGNAL_TYPE_DVI_SINGLE_LINK;
			break;
		}

		case SIGNAL_TYPE_DVI_DUAL_LINK: {
			sink_caps.transaction_type = DDC_TRANSACTION_TYPE_I2C;
			sink_caps.signal = SIGNAL_TYPE_DVI_DUAL_LINK;
			break;
		}

		case SIGNAL_TYPE_LVDS: {
			sink_caps.transaction_type = DDC_TRANSACTION_TYPE_I2C;
			sink_caps.signal = SIGNAL_TYPE_LVDS;
			break;
		}

		case SIGNAL_TYPE_EDP: {
			read_current_link_settings_on_detect(link);

			detect_edp_sink_caps(link);
			read_current_link_settings_on_detect(link);

			/* Disable power sequence on MIPI panel + converter
			 */
			if (dc->config.enable_mipi_converter_optimization &&
				dc_ctx->dce_version == DCN_VERSION_3_01 &&
				link->dpcd_caps.sink_dev_id == DP_BRANCH_DEVICE_ID_0022B9 &&
				memcmp(&link->dpcd_caps.branch_dev_name, DP_SINK_BRANCH_DEV_NAME_7580,
					sizeof(link->dpcd_caps.branch_dev_name)) == 0) {
				dc->config.edp_no_power_sequencing = true;

				if (!link->dpcd_caps.set_power_state_capable_edp)
					link->wa_flags.dp_keep_receiver_powered = true;
			}

			sink_caps.transaction_type = DDC_TRANSACTION_TYPE_I2C_OVER_AUX;
			sink_caps.signal = SIGNAL_TYPE_EDP;
			break;
		}

		case SIGNAL_TYPE_DISPLAY_PORT: {
			/* wa HPD high coming too early*/
			if (link->ep_type == DISPLAY_ENDPOINT_PHY &&
			    link->link_enc->features.flags.bits.DP_IS_USB_C == 1) {
				/* if alt mode times out, return false */
				if (!wait_for_entering_dp_alt_mode(link))
					return false;
			}

			if (!detect_dp(link, &sink_caps, reason)) {
				link->type = pre_connection_type;

				if (prev_sink)
					dc_sink_release(prev_sink);
				return false;
			}

			/* Active SST downstream branch device unplug*/
			if (link->type == dc_connection_sst_branch &&
			    link->dpcd_caps.sink_count.bits.SINK_COUNT == 0) {
				if (prev_sink)
					/* Downstream unplug */
					dc_sink_release(prev_sink);
				return true;
			}

			/* disable audio for non DP to HDMI active sst converter */
			if (link->type == dc_connection_sst_branch &&
					is_dp_active_dongle(link) &&
					(link->dpcd_caps.dongle_type !=
							DISPLAY_DONGLE_DP_HDMI_CONVERTER))
				converter_disable_audio = true;

			/* limited link rate to HBR3 for DPIA until we implement USB4 V2 */
			if (link->ep_type == DISPLAY_ENDPOINT_USB4_DPIA &&
					link->reported_link_cap.link_rate > LINK_RATE_HIGH3)
				link->reported_link_cap.link_rate = LINK_RATE_HIGH3;
			break;
		}

		default:
			DC_ERROR("Invalid connector type! signal:%d\n",
				 link->connector_signal);
			if (prev_sink)
				dc_sink_release(prev_sink);
			return false;
		} /* switch() */

		if (link->dpcd_caps.sink_count.bits.SINK_COUNT)
			link->dpcd_sink_count =
				link->dpcd_caps.sink_count.bits.SINK_COUNT;
		else
			link->dpcd_sink_count = 1;

		dal_ddc_service_set_transaction_type(link->ddc,
						     sink_caps.transaction_type);

		link->aux_mode =
			dal_ddc_service_is_in_aux_transaction_mode(link->ddc);

		sink_init_data.link = link;
		sink_init_data.sink_signal = sink_caps.signal;

		sink = dc_sink_create(&sink_init_data);
		if (!sink) {
			DC_ERROR("Failed to create sink!\n");
			if (prev_sink)
				dc_sink_release(prev_sink);
			return false;
		}

		sink->link->dongle_max_pix_clk = sink_caps.max_hdmi_pixel_clock;
		sink->converter_disable_audio = converter_disable_audio;

		/* dc_sink_create returns a new reference */
		link->local_sink = sink;

		edid_status = dm_helpers_read_local_edid(link->ctx,
							 link, sink);

		switch (edid_status) {
		case EDID_BAD_CHECKSUM:
			DC_LOG_ERROR("EDID checksum invalid.\n");
			break;
		case EDID_PARTIAL_VALID:
			DC_LOG_ERROR("Partial EDID valid, abandon invalid blocks.\n");
			break;
		case EDID_NO_RESPONSE:
			DC_LOG_ERROR("No EDID read.\n");
			/*
			 * Abort detection for non-DP connectors if we have
			 * no EDID
			 *
			 * DP needs to report as connected if HDP is high
			 * even if we have no EDID in order to go to
			 * fail-safe mode
			 */
			if (dc_is_hdmi_signal(link->connector_signal) ||
			    dc_is_dvi_signal(link->connector_signal)) {
				if (prev_sink)
					dc_sink_release(prev_sink);

				return false;
			}

			if (link->type == dc_connection_sst_branch &&
					link->dpcd_caps.dongle_type ==
						DISPLAY_DONGLE_DP_VGA_CONVERTER &&
					reason == DETECT_REASON_HPDRX) {
				/* Abort detection for DP-VGA adapters when EDID
				 * can't be read and detection reason is VGA-side
				 * hotplug
				 */
				if (prev_sink)
					dc_sink_release(prev_sink);
				link_disconnect_sink(link);

				return true;
			}

			break;
		default:
			break;
		}

		// Check if edid is the same
		if ((prev_sink) &&
		    (edid_status == EDID_THE_SAME || edid_status == EDID_OK))
			same_edid = is_same_edid(&prev_sink->dc_edid,
						 &sink->dc_edid);

		if (sink->edid_caps.panel_patch.skip_scdc_overwrite)
			link->ctx->dc->debug.hdmi20_disable = true;

		if (link->connector_signal == SIGNAL_TYPE_DISPLAY_PORT &&
		    sink_caps.transaction_type ==
		    DDC_TRANSACTION_TYPE_I2C_OVER_AUX) {
			/*
			 * TODO debug why Dell 2413 doesn't like
			 *  two link trainings
			 */
#if defined(CONFIG_DRM_AMD_DC_HDCP)
			query_hdcp_capability(sink->sink_signal, link);
#endif
		} else {
			// If edid is the same, then discard new sink and revert back to original sink
			if (same_edid) {
				link_disconnect_remap(prev_sink, link);
				sink = prev_sink;
				prev_sink = NULL;
			}
#if defined(CONFIG_DRM_AMD_DC_HDCP)
			query_hdcp_capability(sink->sink_signal, link);
#endif
		}

		/* HDMI-DVI Dongle */
		if (sink->sink_signal == SIGNAL_TYPE_HDMI_TYPE_A &&
		    !sink->edid_caps.edid_hdmi)
			sink->sink_signal = SIGNAL_TYPE_DVI_SINGLE_LINK;

		if (link->local_sink && dc_is_dp_signal(sink_caps.signal))
			dp_trace_init(link);

		/* Connectivity log: detection */
		for (i = 0; i < sink->dc_edid.length / DC_EDID_BLOCK_SIZE; i++) {
			CONN_DATA_DETECT(link,
					 &sink->dc_edid.raw_edid[i * DC_EDID_BLOCK_SIZE],
					 DC_EDID_BLOCK_SIZE,
					 "%s: [Block %d] ", sink->edid_caps.display_name, i);
		}

		DC_LOG_DETECTION_EDID_PARSER("%s: "
			"manufacturer_id = %X, "
			"product_id = %X, "
			"serial_number = %X, "
			"manufacture_week = %d, "
			"manufacture_year = %d, "
			"display_name = %s, "
			"speaker_flag = %d, "
			"audio_mode_count = %d\n",
			__func__,
			sink->edid_caps.manufacturer_id,
			sink->edid_caps.product_id,
			sink->edid_caps.serial_number,
			sink->edid_caps.manufacture_week,
			sink->edid_caps.manufacture_year,
			sink->edid_caps.display_name,
			sink->edid_caps.speaker_flags,
			sink->edid_caps.audio_mode_count);

		for (i = 0; i < sink->edid_caps.audio_mode_count; i++) {
			DC_LOG_DETECTION_EDID_PARSER("%s: mode number = %d, "
				"format_code = %d, "
				"channel_count = %d, "
				"sample_rate = %d, "
				"sample_size = %d\n",
				__func__,
				i,
				sink->edid_caps.audio_modes[i].format_code,
				sink->edid_caps.audio_modes[i].channel_count,
				sink->edid_caps.audio_modes[i].sample_rate,
				sink->edid_caps.audio_modes[i].sample_size);
		}

		if (link->connector_signal == SIGNAL_TYPE_EDP) {
			/* Init dc_panel_config by HW config */
			if (dc_ctx->dc->res_pool->funcs->get_panel_config_defaults)
				dc_ctx->dc->res_pool->funcs->get_panel_config_defaults(&link->panel_config);
			/* Pickup base DM settings */
			dm_helpers_init_panel_settings(dc_ctx, &link->panel_config, sink);
			// Override dc_panel_config if system has specific settings
			dm_helpers_override_panel_settings(dc_ctx, &link->panel_config);
		}

	} else {
		/* From Connected-to-Disconnected. */
		link->type = dc_connection_none;
		sink_caps.signal = SIGNAL_TYPE_NONE;
		/* When we unplug a passive DP-HDMI dongle connection, dongle_max_pix_clk
		 *  is not cleared. If we emulate a DP signal on this connection, it thinks
		 *  the dongle is still there and limits the number of modes we can emulate.
		 *  Clear dongle_max_pix_clk on disconnect to fix this
		 */
		link->dongle_max_pix_clk = 0;

		dc_link_clear_dprx_states(link);
		dp_trace_reset(link);
	}

	LINK_INFO("link=%d, dc_sink_in=%p is now %s prev_sink=%p edid same=%d\n",
		  link->link_index, sink,
		  (sink_caps.signal ==
		   SIGNAL_TYPE_NONE ? "Disconnected" : "Connected"),
		  prev_sink, same_edid);

	if (prev_sink)
		dc_sink_release(prev_sink);

	return true;
}

bool dc_link_detect(struct dc_link *link, enum dc_detect_reason reason)
{
	bool is_local_sink_detect_success;
	bool is_delegated_to_mst_top_mgr = false;
	enum dc_connection_type pre_link_type = link->type;

	DC_LOGGER_INIT(link->ctx->logger);

	is_local_sink_detect_success = detect_link_and_local_sink(link, reason);

	if (is_local_sink_detect_success && link->local_sink)
		verify_link_capability(link, link->local_sink, reason);

	if (is_local_sink_detect_success && link->local_sink &&
			dc_is_dp_signal(link->local_sink->sink_signal) &&
			link->dpcd_caps.is_mst_capable)
		is_delegated_to_mst_top_mgr = discover_dp_mst_topology(link, reason);

	DC_LOG_DC("%s: link_index=%d is_local_sink_detect_success=%d pre_link_type=%d link_type=%d\n", __func__,
		 link->link_index, is_local_sink_detect_success, pre_link_type, link->type);


	if (is_local_sink_detect_success &&
			pre_link_type == dc_connection_mst_branch &&
			link->type != dc_connection_mst_branch)
		is_delegated_to_mst_top_mgr = reset_cur_dp_mst_topology(link);

	return is_local_sink_detect_success && !is_delegated_to_mst_top_mgr;
}

bool dc_link_get_hpd_state(struct dc_link *dc_link)
{
	uint32_t state;

	dal_gpio_lock_pin(dc_link->hpd_gpio);
	dal_gpio_get_value(dc_link->hpd_gpio, &state);
	dal_gpio_unlock_pin(dc_link->hpd_gpio);

	return state;
}

static enum hpd_source_id get_hpd_line(struct dc_link *link)
{
	struct gpio *hpd;
	enum hpd_source_id hpd_id;

	hpd_id = HPD_SOURCEID_UNKNOWN;

	hpd = get_hpd_gpio(link->ctx->dc_bios, link->link_id,
			   link->ctx->gpio_service);

	if (hpd) {
		switch (dal_irq_get_source(hpd)) {
		case DC_IRQ_SOURCE_HPD1:
			hpd_id = HPD_SOURCEID1;
		break;
		case DC_IRQ_SOURCE_HPD2:
			hpd_id = HPD_SOURCEID2;
		break;
		case DC_IRQ_SOURCE_HPD3:
			hpd_id = HPD_SOURCEID3;
		break;
		case DC_IRQ_SOURCE_HPD4:
			hpd_id = HPD_SOURCEID4;
		break;
		case DC_IRQ_SOURCE_HPD5:
			hpd_id = HPD_SOURCEID5;
		break;
		case DC_IRQ_SOURCE_HPD6:
			hpd_id = HPD_SOURCEID6;
		break;
		default:
			BREAK_TO_DEBUGGER();
		break;
		}

		dal_gpio_destroy_irq(&hpd);
	}

	return hpd_id;
}

static enum channel_id get_ddc_line(struct dc_link *link)
{
	struct ddc *ddc;
	enum channel_id channel;

	channel = CHANNEL_ID_UNKNOWN;

	ddc = dal_ddc_service_get_ddc_pin(link->ddc);

	if (ddc) {
		switch (dal_ddc_get_line(ddc)) {
		case GPIO_DDC_LINE_DDC1:
			channel = CHANNEL_ID_DDC1;
			break;
		case GPIO_DDC_LINE_DDC2:
			channel = CHANNEL_ID_DDC2;
			break;
		case GPIO_DDC_LINE_DDC3:
			channel = CHANNEL_ID_DDC3;
			break;
		case GPIO_DDC_LINE_DDC4:
			channel = CHANNEL_ID_DDC4;
			break;
		case GPIO_DDC_LINE_DDC5:
			channel = CHANNEL_ID_DDC5;
			break;
		case GPIO_DDC_LINE_DDC6:
			channel = CHANNEL_ID_DDC6;
			break;
		case GPIO_DDC_LINE_DDC_VGA:
			channel = CHANNEL_ID_DDC_VGA;
			break;
		case GPIO_DDC_LINE_I2C_PAD:
			channel = CHANNEL_ID_I2C_PAD;
			break;
		default:
			BREAK_TO_DEBUGGER();
			break;
		}
	}

	return channel;
}

static enum transmitter translate_encoder_to_transmitter(struct graphics_object_id encoder)
{
	switch (encoder.id) {
	case ENCODER_ID_INTERNAL_UNIPHY:
		switch (encoder.enum_id) {
		case ENUM_ID_1:
			return TRANSMITTER_UNIPHY_A;
		case ENUM_ID_2:
			return TRANSMITTER_UNIPHY_B;
		default:
			return TRANSMITTER_UNKNOWN;
		}
	break;
	case ENCODER_ID_INTERNAL_UNIPHY1:
		switch (encoder.enum_id) {
		case ENUM_ID_1:
			return TRANSMITTER_UNIPHY_C;
		case ENUM_ID_2:
			return TRANSMITTER_UNIPHY_D;
		default:
			return TRANSMITTER_UNKNOWN;
		}
	break;
	case ENCODER_ID_INTERNAL_UNIPHY2:
		switch (encoder.enum_id) {
		case ENUM_ID_1:
			return TRANSMITTER_UNIPHY_E;
		case ENUM_ID_2:
			return TRANSMITTER_UNIPHY_F;
		default:
			return TRANSMITTER_UNKNOWN;
		}
	break;
	case ENCODER_ID_INTERNAL_UNIPHY3:
		switch (encoder.enum_id) {
		case ENUM_ID_1:
			return TRANSMITTER_UNIPHY_G;
		default:
			return TRANSMITTER_UNKNOWN;
		}
	break;
	case ENCODER_ID_EXTERNAL_NUTMEG:
		switch (encoder.enum_id) {
		case ENUM_ID_1:
			return TRANSMITTER_NUTMEG_CRT;
		default:
			return TRANSMITTER_UNKNOWN;
		}
	break;
	case ENCODER_ID_EXTERNAL_TRAVIS:
		switch (encoder.enum_id) {
		case ENUM_ID_1:
			return TRANSMITTER_TRAVIS_CRT;
		case ENUM_ID_2:
			return TRANSMITTER_TRAVIS_LCD;
		default:
			return TRANSMITTER_UNKNOWN;
		}
	break;
	default:
		return TRANSMITTER_UNKNOWN;
	}
}

static bool dc_link_construct_legacy(struct dc_link *link,
				     const struct link_init_data *init_params)
{
	uint8_t i;
	struct ddc_service_init_data ddc_service_init_data = { 0 };
	struct dc_context *dc_ctx = init_params->ctx;
	struct encoder_init_data enc_init_data = { 0 };
	struct panel_cntl_init_data panel_cntl_init_data = { 0 };
	struct integrated_info *info;
	struct dc_bios *bios = init_params->dc->ctx->dc_bios;
	const struct dc_vbios_funcs *bp_funcs = bios->funcs;
	struct bp_disp_connector_caps_info disp_connect_caps_info = { 0 };

	DC_LOGGER_INIT(dc_ctx->logger);

	info = kzalloc(sizeof(*info), GFP_KERNEL);
	if (!info)
		goto create_fail;

	link->irq_source_hpd = DC_IRQ_SOURCE_INVALID;
	link->irq_source_hpd_rx = DC_IRQ_SOURCE_INVALID;

	link->link_status.dpcd_caps = &link->dpcd_caps;

	link->dc = init_params->dc;
	link->ctx = dc_ctx;
	link->link_index = init_params->link_index;

	memset(&link->preferred_training_settings, 0,
	       sizeof(struct dc_link_training_overrides));
	memset(&link->preferred_link_setting, 0,
	       sizeof(struct dc_link_settings));

	link->link_id =
		bios->funcs->get_connector_id(bios, init_params->connector_index);

	link->ep_type = DISPLAY_ENDPOINT_PHY;

	DC_LOG_DC("BIOS object table - link_id: %d", link->link_id.id);

	if (bios->funcs->get_disp_connector_caps_info) {
		bios->funcs->get_disp_connector_caps_info(bios, link->link_id, &disp_connect_caps_info);
		link->is_internal_display = disp_connect_caps_info.INTERNAL_DISPLAY;
		DC_LOG_DC("BIOS object table - is_internal_display: %d", link->is_internal_display);
	}

	if (link->link_id.type != OBJECT_TYPE_CONNECTOR) {
		dm_output_to_console("%s: Invalid Connector ObjectID from Adapter Service for connector index:%d! type %d expected %d\n",
				     __func__, init_params->connector_index,
				     link->link_id.type, OBJECT_TYPE_CONNECTOR);
		goto create_fail;
	}

	if (link->dc->res_pool->funcs->link_init)
		link->dc->res_pool->funcs->link_init(link);

	link->hpd_gpio = get_hpd_gpio(link->ctx->dc_bios, link->link_id,
				      link->ctx->gpio_service);

	if (link->hpd_gpio) {
		dal_gpio_open(link->hpd_gpio, GPIO_MODE_INTERRUPT);
		dal_gpio_unlock_pin(link->hpd_gpio);
		link->irq_source_hpd = dal_irq_get_source(link->hpd_gpio);

		DC_LOG_DC("BIOS object table - hpd_gpio id: %d", link->hpd_gpio->id);
		DC_LOG_DC("BIOS object table - hpd_gpio en: %d", link->hpd_gpio->en);
	}

	switch (link->link_id.id) {
	case CONNECTOR_ID_HDMI_TYPE_A:
		link->connector_signal = SIGNAL_TYPE_HDMI_TYPE_A;

		break;
	case CONNECTOR_ID_SINGLE_LINK_DVID:
	case CONNECTOR_ID_SINGLE_LINK_DVII:
		link->connector_signal = SIGNAL_TYPE_DVI_SINGLE_LINK;
		break;
	case CONNECTOR_ID_DUAL_LINK_DVID:
	case CONNECTOR_ID_DUAL_LINK_DVII:
		link->connector_signal = SIGNAL_TYPE_DVI_DUAL_LINK;
		break;
	case CONNECTOR_ID_DISPLAY_PORT:
	case CONNECTOR_ID_USBC:
		link->connector_signal = SIGNAL_TYPE_DISPLAY_PORT;

		if (link->hpd_gpio)
			link->irq_source_hpd_rx =
					dal_irq_get_rx_source(link->hpd_gpio);

		break;
	case CONNECTOR_ID_EDP:
		link->connector_signal = SIGNAL_TYPE_EDP;

		if (link->hpd_gpio) {
			if (!link->dc->config.allow_edp_hotplug_detection)
				link->irq_source_hpd = DC_IRQ_SOURCE_INVALID;

			switch (link->dc->config.allow_edp_hotplug_detection) {
			case HPD_EN_FOR_ALL_EDP:
				link->irq_source_hpd_rx =
						dal_irq_get_rx_source(link->hpd_gpio);
				break;
			case HPD_EN_FOR_PRIMARY_EDP_ONLY:
				if (link->link_index == 0)
					link->irq_source_hpd_rx =
						dal_irq_get_rx_source(link->hpd_gpio);
				else
					link->irq_source_hpd = DC_IRQ_SOURCE_INVALID;
				break;
			case HPD_EN_FOR_SECONDARY_EDP_ONLY:
				if (link->link_index == 1)
					link->irq_source_hpd_rx =
						dal_irq_get_rx_source(link->hpd_gpio);
				else
					link->irq_source_hpd = DC_IRQ_SOURCE_INVALID;
				break;
			default:
				link->irq_source_hpd = DC_IRQ_SOURCE_INVALID;
				break;
			}
		}

		break;
	case CONNECTOR_ID_LVDS:
		link->connector_signal = SIGNAL_TYPE_LVDS;
		break;
	default:
		DC_LOG_WARNING("Unsupported Connector type:%d!\n",
			       link->link_id.id);
		goto create_fail;
	}

	/* TODO: #DAL3 Implement id to str function.*/
	LINK_INFO("Connector[%d] description:"
		  "signal %d\n",
		  init_params->connector_index,
		  link->connector_signal);

	ddc_service_init_data.ctx = link->ctx;
	ddc_service_init_data.id = link->link_id;
	ddc_service_init_data.link = link;
	link->ddc = dal_ddc_service_create(&ddc_service_init_data);

	if (!link->ddc) {
		DC_ERROR("Failed to create ddc_service!\n");
		goto ddc_create_fail;
	}

	if (!link->ddc->ddc_pin) {
		DC_ERROR("Failed to get I2C info for connector!\n");
		goto ddc_create_fail;
	}

	link->ddc_hw_inst =
		dal_ddc_get_line(dal_ddc_service_get_ddc_pin(link->ddc));


	if (link->dc->res_pool->funcs->panel_cntl_create &&
		(link->link_id.id == CONNECTOR_ID_EDP ||
			link->link_id.id == CONNECTOR_ID_LVDS)) {
		panel_cntl_init_data.ctx = dc_ctx;
		panel_cntl_init_data.inst =
			panel_cntl_init_data.ctx->dc_edp_id_count;
		link->panel_cntl =
			link->dc->res_pool->funcs->panel_cntl_create(
								&panel_cntl_init_data);
		panel_cntl_init_data.ctx->dc_edp_id_count++;

		if (link->panel_cntl == NULL) {
			DC_ERROR("Failed to create link panel_cntl!\n");
			goto panel_cntl_create_fail;
		}
	}

	enc_init_data.ctx = dc_ctx;
	bp_funcs->get_src_obj(dc_ctx->dc_bios, link->link_id, 0,
			      &enc_init_data.encoder);
	enc_init_data.connector = link->link_id;
	enc_init_data.channel = get_ddc_line(link);
	enc_init_data.hpd_source = get_hpd_line(link);

	link->hpd_src = enc_init_data.hpd_source;

	enc_init_data.transmitter =
		translate_encoder_to_transmitter(enc_init_data.encoder);
	link->link_enc =
		link->dc->res_pool->funcs->link_enc_create(dc_ctx, &enc_init_data);

	if (!link->link_enc) {
		DC_ERROR("Failed to create link encoder!\n");
		goto link_enc_create_fail;
	}

	DC_LOG_DC("BIOS object table - DP_IS_USB_C: %d", link->link_enc->features.flags.bits.DP_IS_USB_C);
	DC_LOG_DC("BIOS object table - IS_DP2_CAPABLE: %d", link->link_enc->features.flags.bits.IS_DP2_CAPABLE);

	/* Update link encoder tracking variables. These are used for the dynamic
	 * assignment of link encoders to streams.
	 */
	link->eng_id = link->link_enc->preferred_engine;
	link->dc->res_pool->link_encoders[link->eng_id - ENGINE_ID_DIGA] = link->link_enc;
	link->dc->res_pool->dig_link_enc_count++;

	link->link_enc_hw_inst = link->link_enc->transmitter;

	for (i = 0; i < 4; i++) {
		if (bp_funcs->get_device_tag(dc_ctx->dc_bios,
					     link->link_id, i,
					     &link->device_tag) != BP_RESULT_OK) {
			DC_ERROR("Failed to find device tag!\n");
			goto device_tag_fail;
		}

		/* Look for device tag that matches connector signal,
		 * CRT for rgb, LCD for other supported signal tyes
		 */
		if (!bp_funcs->is_device_id_supported(dc_ctx->dc_bios,
						      link->device_tag.dev_id))
			continue;
		if (link->device_tag.dev_id.device_type == DEVICE_TYPE_CRT &&
		    link->connector_signal != SIGNAL_TYPE_RGB)
			continue;
		if (link->device_tag.dev_id.device_type == DEVICE_TYPE_LCD &&
		    link->connector_signal == SIGNAL_TYPE_RGB)
			continue;

		DC_LOG_DC("BIOS object table - device_tag.acpi_device: %d", link->device_tag.acpi_device);
		DC_LOG_DC("BIOS object table - device_tag.dev_id.device_type: %d", link->device_tag.dev_id.device_type);
		DC_LOG_DC("BIOS object table - device_tag.dev_id.enum_id: %d", link->device_tag.dev_id.enum_id);
		break;
	}

	if (bios->integrated_info)
		memcpy(info, bios->integrated_info, sizeof(*info));

	/* Look for channel mapping corresponding to connector and device tag */
	for (i = 0; i < MAX_NUMBER_OF_EXT_DISPLAY_PATH; i++) {
		struct external_display_path *path =
			&info->ext_disp_conn_info.path[i];

		if (path->device_connector_id.enum_id == link->link_id.enum_id &&
		    path->device_connector_id.id == link->link_id.id &&
		    path->device_connector_id.type == link->link_id.type) {
			if (link->device_tag.acpi_device != 0 &&
			    path->device_acpi_enum == link->device_tag.acpi_device) {
				link->ddi_channel_mapping = path->channel_mapping;
				link->chip_caps = path->caps;
				DC_LOG_DC("BIOS object table - ddi_channel_mapping: 0x%04X", link->ddi_channel_mapping.raw);
				DC_LOG_DC("BIOS object table - chip_caps: %d", link->chip_caps);
			} else if (path->device_tag ==
				   link->device_tag.dev_id.raw_device_tag) {
				link->ddi_channel_mapping = path->channel_mapping;
				link->chip_caps = path->caps;
				DC_LOG_DC("BIOS object table - ddi_channel_mapping: 0x%04X", link->ddi_channel_mapping.raw);
				DC_LOG_DC("BIOS object table - chip_caps: %d", link->chip_caps);
			}

			if (link->chip_caps & EXT_DISPLAY_PATH_CAPS__DP_FIXED_VS_EN) {
				link->bios_forced_drive_settings.VOLTAGE_SWING =
						(info->ext_disp_conn_info.fixdpvoltageswing & 0x3);
				link->bios_forced_drive_settings.PRE_EMPHASIS =
						((info->ext_disp_conn_info.fixdpvoltageswing >> 2) & 0x3);
			}

			break;
		}
	}

	if (bios->funcs->get_atom_dc_golden_table)
		bios->funcs->get_atom_dc_golden_table(bios);

	/*
	 * TODO check if GPIO programmed correctly
	 *
	 * If GPIO isn't programmed correctly HPD might not rise or drain
	 * fast enough, leading to bounces.
	 */
	program_hpd_filter(link);

	link->psr_settings.psr_vtotal_control_support = false;
	link->psr_settings.psr_version = DC_PSR_VERSION_UNSUPPORTED;

	DC_LOG_DC("BIOS object table - %s finished successfully.\n", __func__);
	kfree(info);
	return true;
device_tag_fail:
	link->link_enc->funcs->destroy(&link->link_enc);
link_enc_create_fail:
	if (link->panel_cntl != NULL)
		link->panel_cntl->funcs->destroy(&link->panel_cntl);
panel_cntl_create_fail:
	dal_ddc_service_destroy(&link->ddc);
ddc_create_fail:
create_fail:

	if (link->hpd_gpio) {
		dal_gpio_destroy_irq(&link->hpd_gpio);
		link->hpd_gpio = NULL;
	}

	DC_LOG_DC("BIOS object table - %s failed.\n", __func__);
	kfree(info);

	return false;
}

static bool dc_link_construct_dpia(struct dc_link *link,
				   const struct link_init_data *init_params)
{
	struct ddc_service_init_data ddc_service_init_data = { 0 };
	struct dc_context *dc_ctx = init_params->ctx;

	DC_LOGGER_INIT(dc_ctx->logger);

	/* Initialized irq source for hpd and hpd rx */
	link->irq_source_hpd = DC_IRQ_SOURCE_INVALID;
	link->irq_source_hpd_rx = DC_IRQ_SOURCE_INVALID;
	link->link_status.dpcd_caps = &link->dpcd_caps;

	link->dc = init_params->dc;
	link->ctx = dc_ctx;
	link->link_index = init_params->link_index;

	memset(&link->preferred_training_settings, 0,
	       sizeof(struct dc_link_training_overrides));
	memset(&link->preferred_link_setting, 0,
	       sizeof(struct dc_link_settings));

	/* Dummy Init for linkid */
	link->link_id.type = OBJECT_TYPE_CONNECTOR;
	link->link_id.id = CONNECTOR_ID_DISPLAY_PORT;
	link->link_id.enum_id = ENUM_ID_1 + init_params->connector_index;
	link->is_internal_display = false;
	link->connector_signal = SIGNAL_TYPE_DISPLAY_PORT;
	LINK_INFO("Connector[%d] description:signal %d\n",
		  init_params->connector_index,
		  link->connector_signal);

	link->ep_type = DISPLAY_ENDPOINT_USB4_DPIA;
	link->is_dig_mapping_flexible = true;

	/* TODO: Initialize link : funcs->link_init */

	ddc_service_init_data.ctx = link->ctx;
	ddc_service_init_data.id = link->link_id;
	ddc_service_init_data.link = link;
	/* Set indicator for dpia link so that ddc won't be created */
	ddc_service_init_data.is_dpia_link = true;

	link->ddc = dal_ddc_service_create(&ddc_service_init_data);
	if (!link->ddc) {
		DC_ERROR("Failed to create ddc_service!\n");
		goto ddc_create_fail;
	}

	/* Set dpia port index : 0 to number of dpia ports */
	link->ddc_hw_inst = init_params->connector_index;

	/* TODO: Create link encoder */

	link->psr_settings.psr_version = DC_PSR_VERSION_UNSUPPORTED;

	/* Some docks seem to NAK I2C writes to segment pointer with mot=0. */
	link->wa_flags.dp_mot_reset_segment = true;

	return true;

ddc_create_fail:
	return false;
}

static bool dc_link_construct(struct dc_link *link,
			      const struct link_init_data *init_params)
{
	/* Handle dpia case */
	if (init_params->is_dpia_link)
		return dc_link_construct_dpia(link, init_params);
	else
		return dc_link_construct_legacy(link, init_params);
}
/*******************************************************************************
 * Public functions
 ******************************************************************************/
struct dc_link *link_create(const struct link_init_data *init_params)
{
	struct dc_link *link =
			kzalloc(sizeof(*link), GFP_KERNEL);

	if (NULL == link)
		goto alloc_fail;

	if (false == dc_link_construct(link, init_params))
		goto construct_fail;

	return link;

construct_fail:
	kfree(link);

alloc_fail:
	return NULL;
}

void link_destroy(struct dc_link **link)
{
	dc_link_destruct(*link);
	kfree(*link);
	*link = NULL;
}

static void enable_stream_features(struct pipe_ctx *pipe_ctx)
{
	struct dc_stream_state *stream = pipe_ctx->stream;

	if (pipe_ctx->stream->signal != SIGNAL_TYPE_DISPLAY_PORT_MST) {
		struct dc_link *link = stream->link;
		union down_spread_ctrl old_downspread;
		union down_spread_ctrl new_downspread;

		memset(&old_downspread, 0, sizeof(old_downspread));

		core_link_read_dpcd(link, DP_DOWNSPREAD_CTRL,
				&old_downspread.raw, sizeof(old_downspread));

		new_downspread.raw = old_downspread.raw;

		new_downspread.bits.IGNORE_MSA_TIMING_PARAM =
				(stream->ignore_msa_timing_param) ? 1 : 0;

		if (new_downspread.raw != old_downspread.raw) {
			core_link_write_dpcd(link, DP_DOWNSPREAD_CTRL,
				&new_downspread.raw, sizeof(new_downspread));
		}

	} else {
		dm_helpers_mst_enable_stream_features(stream);
	}
}

static enum dc_status enable_link_dp(struct dc_state *state,
				     struct pipe_ctx *pipe_ctx)
{
	struct dc_stream_state *stream = pipe_ctx->stream;
	enum dc_status status;
	bool skip_video_pattern;
	struct dc_link *link = stream->link;
	const struct dc_link_settings *link_settings =
			&pipe_ctx->link_config.dp_link_settings;
	bool fec_enable;
	int i;
	bool apply_seamless_boot_optimization = false;
	uint32_t bl_oled_enable_delay = 50; // in ms
	uint32_t post_oui_delay = 30; // 30ms
	/* Reduce link bandwidth between failed link training attempts. */
	bool do_fallback = false;

	// check for seamless boot
	for (i = 0; i < state->stream_count; i++) {
		if (state->streams[i]->apply_seamless_boot_optimization) {
			apply_seamless_boot_optimization = true;
			break;
		}
	}

	/* Train with fallback when enabling DPIA link. Conventional links are
	 * trained with fallback during sink detection.
	 */
	if (link->ep_type == DISPLAY_ENDPOINT_USB4_DPIA)
		do_fallback = true;

	/*
	 * Temporary w/a to get DP2.0 link rates to work with SST.
	 * TODO DP2.0 - Workaround: Remove w/a if and when the issue is resolved.
	 */
	if (dp_get_link_encoding_format(link_settings) == DP_128b_132b_ENCODING &&
			pipe_ctx->stream->signal == SIGNAL_TYPE_DISPLAY_PORT &&
			link->dc->debug.set_mst_en_for_sst) {
		dp_enable_mst_on_sink(link, true);
	}

	if (pipe_ctx->stream->signal == SIGNAL_TYPE_EDP) {
		/*in case it is not on*/
		if (!link->dc->config.edp_no_power_sequencing)
			link->dc->hwss.edp_power_control(link, true);
		link->dc->hwss.edp_wait_for_hpd_ready(link, true);
	}

	if (dp_get_link_encoding_format(link_settings) == DP_128b_132b_ENCODING) {
		/* TODO - DP2.0 HW: calculate 32 symbol clock for HPO encoder */
	} else {
		pipe_ctx->stream_res.pix_clk_params.requested_sym_clk =
				link_settings->link_rate * LINK_RATE_REF_FREQ_IN_KHZ;
		if (state->clk_mgr && !apply_seamless_boot_optimization)
			state->clk_mgr->funcs->update_clocks(state->clk_mgr,
					state, false);
	}

	// during mode switch we do DP_SET_POWER off then on, and OUI is lost
	dpcd_set_source_specific_data(link);
	if (link->dpcd_sink_ext_caps.raw != 0) {
		post_oui_delay += link->panel_config.pps.extra_post_OUI_ms;
		msleep(post_oui_delay);
	}

	// similarly, mode switch can cause loss of cable ID
	dpcd_write_cable_id_to_dprx(link);

	skip_video_pattern = true;

	if (link_settings->link_rate == LINK_RATE_LOW)
		skip_video_pattern = false;

	if (perform_link_training_with_retries(link_settings,
					       skip_video_pattern,
					       LINK_TRAINING_ATTEMPTS,
					       pipe_ctx,
					       pipe_ctx->stream->signal,
					       do_fallback)) {
		status = DC_OK;
	} else {
		status = DC_FAIL_DP_LINK_TRAINING;
	}

	if (link->preferred_training_settings.fec_enable)
		fec_enable = *link->preferred_training_settings.fec_enable;
	else
		fec_enable = true;

	if (dp_get_link_encoding_format(link_settings) == DP_8b_10b_ENCODING)
		dp_set_fec_enable(link, fec_enable);

	// during mode set we do DP_SET_POWER off then on, aux writes are lost
	if (link->dpcd_sink_ext_caps.bits.oled == 1 ||
		link->dpcd_sink_ext_caps.bits.sdr_aux_backlight_control == 1 ||
		link->dpcd_sink_ext_caps.bits.hdr_aux_backlight_control == 1) {
		dc_link_set_default_brightness_aux(link); // TODO: use cached if known
		if (link->dpcd_sink_ext_caps.bits.oled == 1)
			msleep(bl_oled_enable_delay);
		dc_link_backlight_enable_aux(link, true);
	}

	return status;
}

static enum dc_status enable_link_edp(
		struct dc_state *state,
		struct pipe_ctx *pipe_ctx)
{
	return enable_link_dp(state, pipe_ctx);
}

static enum dc_status enable_link_dp_mst(
		struct dc_state *state,
		struct pipe_ctx *pipe_ctx)
{
	struct dc_link *link = pipe_ctx->stream->link;
	unsigned char mstm_cntl;

	/* sink signal type after MST branch is MST. Multiple MST sinks
	 * share one link. Link DP PHY is enable or training only once.
	 */
	if (link->link_status.link_active)
		return DC_OK;

	/* clear payload table */
	core_link_read_dpcd(link, DP_MSTM_CTRL, &mstm_cntl, 1);
	if (mstm_cntl & DP_MST_EN)
		dm_helpers_dp_mst_clear_payload_allocation_table(link->ctx, link);

	/* to make sure the pending down rep can be processed
	 * before enabling the link
	 */
	dm_helpers_dp_mst_poll_pending_down_reply(link->ctx, link);

	/* set the sink to MST mode before enabling the link */
	dp_enable_mst_on_sink(link, true);

	return enable_link_dp(state, pipe_ctx);
}

void dc_link_blank_all_dp_displays(struct dc *dc)
{
	unsigned int i;
	uint8_t dpcd_power_state = '\0';
	enum dc_status status = DC_ERROR_UNEXPECTED;

	for (i = 0; i < dc->link_count; i++) {
		if ((dc->links[i]->connector_signal != SIGNAL_TYPE_DISPLAY_PORT) ||
			(dc->links[i]->priv == NULL) || (dc->links[i]->local_sink == NULL))
			continue;

		/* DP 2.0 spec requires that we read LTTPR caps first */
		dp_retrieve_lttpr_cap(dc->links[i]);
		/* if any of the displays are lit up turn them off */
		status = core_link_read_dpcd(dc->links[i], DP_SET_POWER,
							&dpcd_power_state, sizeof(dpcd_power_state));

		if (status == DC_OK && dpcd_power_state == DP_POWER_STATE_D0)
			dc_link_blank_dp_stream(dc->links[i], true);
	}

}

void dc_link_blank_all_edp_displays(struct dc *dc)
{
	unsigned int i;
	uint8_t dpcd_power_state = '\0';
	enum dc_status status = DC_ERROR_UNEXPECTED;

	for (i = 0; i < dc->link_count; i++) {
		if ((dc->links[i]->connector_signal != SIGNAL_TYPE_EDP) ||
			(!dc->links[i]->edp_sink_present))
			continue;

		/* if any of the displays are lit up turn them off */
		status = core_link_read_dpcd(dc->links[i], DP_SET_POWER,
							&dpcd_power_state, sizeof(dpcd_power_state));

		if (status == DC_OK && dpcd_power_state == DP_POWER_STATE_D0)
			dc_link_blank_dp_stream(dc->links[i], true);
	}
}

void dc_link_blank_dp_stream(struct dc_link *link, bool hw_init)
{
	unsigned int j;
	struct dc  *dc = link->ctx->dc;
	enum signal_type signal = link->connector_signal;

	if ((signal == SIGNAL_TYPE_EDP) ||
		(signal == SIGNAL_TYPE_DISPLAY_PORT)) {
		if (link->ep_type == DISPLAY_ENDPOINT_PHY &&
			link->link_enc->funcs->get_dig_frontend &&
			link->link_enc->funcs->is_dig_enabled(link->link_enc)) {
			unsigned int fe = link->link_enc->funcs->get_dig_frontend(link->link_enc);

			if (fe != ENGINE_ID_UNKNOWN)
				for (j = 0; j < dc->res_pool->stream_enc_count; j++) {
					if (fe == dc->res_pool->stream_enc[j]->id) {
						dc->res_pool->stream_enc[j]->funcs->dp_blank(link,
									dc->res_pool->stream_enc[j]);
						break;
					}
				}
		}

		if ((!link->wa_flags.dp_keep_receiver_powered) || hw_init)
			dp_receiver_power_ctrl(link, false);
	}
}

static bool get_ext_hdmi_settings(struct pipe_ctx *pipe_ctx,
		enum engine_id eng_id,
		struct ext_hdmi_settings *settings)
{
	bool result = false;
	int i = 0;
	struct integrated_info *integrated_info =
			pipe_ctx->stream->ctx->dc_bios->integrated_info;

	if (integrated_info == NULL)
		return false;

	/*
	 * Get retimer settings from sbios for passing SI eye test for DCE11
	 * The setting values are varied based on board revision and port id
	 * Therefore the setting values of each ports is passed by sbios.
	 */

	// Check if current bios contains ext Hdmi settings
	if (integrated_info->gpu_cap_info & 0x20) {
		switch (eng_id) {
		case ENGINE_ID_DIGA:
			settings->slv_addr = integrated_info->dp0_ext_hdmi_slv_addr;
			settings->reg_num = integrated_info->dp0_ext_hdmi_6g_reg_num;
			settings->reg_num_6g = integrated_info->dp0_ext_hdmi_6g_reg_num;
			memmove(settings->reg_settings,
					integrated_info->dp0_ext_hdmi_reg_settings,
					sizeof(integrated_info->dp0_ext_hdmi_reg_settings));
			memmove(settings->reg_settings_6g,
					integrated_info->dp0_ext_hdmi_6g_reg_settings,
					sizeof(integrated_info->dp0_ext_hdmi_6g_reg_settings));
			result = true;
			break;
		case ENGINE_ID_DIGB:
			settings->slv_addr = integrated_info->dp1_ext_hdmi_slv_addr;
			settings->reg_num = integrated_info->dp1_ext_hdmi_6g_reg_num;
			settings->reg_num_6g = integrated_info->dp1_ext_hdmi_6g_reg_num;
			memmove(settings->reg_settings,
					integrated_info->dp1_ext_hdmi_reg_settings,
					sizeof(integrated_info->dp1_ext_hdmi_reg_settings));
			memmove(settings->reg_settings_6g,
					integrated_info->dp1_ext_hdmi_6g_reg_settings,
					sizeof(integrated_info->dp1_ext_hdmi_6g_reg_settings));
			result = true;
			break;
		case ENGINE_ID_DIGC:
			settings->slv_addr = integrated_info->dp2_ext_hdmi_slv_addr;
			settings->reg_num = integrated_info->dp2_ext_hdmi_6g_reg_num;
			settings->reg_num_6g = integrated_info->dp2_ext_hdmi_6g_reg_num;
			memmove(settings->reg_settings,
					integrated_info->dp2_ext_hdmi_reg_settings,
					sizeof(integrated_info->dp2_ext_hdmi_reg_settings));
			memmove(settings->reg_settings_6g,
					integrated_info->dp2_ext_hdmi_6g_reg_settings,
					sizeof(integrated_info->dp2_ext_hdmi_6g_reg_settings));
			result = true;
			break;
		case ENGINE_ID_DIGD:
			settings->slv_addr = integrated_info->dp3_ext_hdmi_slv_addr;
			settings->reg_num = integrated_info->dp3_ext_hdmi_6g_reg_num;
			settings->reg_num_6g = integrated_info->dp3_ext_hdmi_6g_reg_num;
			memmove(settings->reg_settings,
					integrated_info->dp3_ext_hdmi_reg_settings,
					sizeof(integrated_info->dp3_ext_hdmi_reg_settings));
			memmove(settings->reg_settings_6g,
					integrated_info->dp3_ext_hdmi_6g_reg_settings,
					sizeof(integrated_info->dp3_ext_hdmi_6g_reg_settings));
			result = true;
			break;
		default:
			break;
		}

		if (result == true) {
			// Validate settings from bios integrated info table
			if (settings->slv_addr == 0)
				return false;
			if (settings->reg_num > 9)
				return false;
			if (settings->reg_num_6g > 3)
				return false;

			for (i = 0; i < settings->reg_num; i++) {
				if (settings->reg_settings[i].i2c_reg_index > 0x20)
					return false;
			}

			for (i = 0; i < settings->reg_num_6g; i++) {
				if (settings->reg_settings_6g[i].i2c_reg_index > 0x20)
					return false;
			}
		}
	}

	return result;
}

static bool i2c_write(struct pipe_ctx *pipe_ctx,
		uint8_t address, uint8_t *buffer, uint32_t length)
{
	struct i2c_command cmd = {0};
	struct i2c_payload payload = {0};

	memset(&payload, 0, sizeof(payload));
	memset(&cmd, 0, sizeof(cmd));

	cmd.number_of_payloads = 1;
	cmd.engine = I2C_COMMAND_ENGINE_DEFAULT;
	cmd.speed = pipe_ctx->stream->ctx->dc->caps.i2c_speed_in_khz;

	payload.address = address;
	payload.data = buffer;
	payload.length = length;
	payload.write = true;
	cmd.payloads = &payload;

	if (dm_helpers_submit_i2c(pipe_ctx->stream->ctx,
			pipe_ctx->stream->link, &cmd))
		return true;

	return false;
}

static void write_i2c_retimer_setting(
		struct pipe_ctx *pipe_ctx,
		bool is_vga_mode,
		bool is_over_340mhz,
		struct ext_hdmi_settings *settings)
{
	uint8_t slave_address = (settings->slv_addr >> 1);
	uint8_t buffer[2];
	const uint8_t apply_rx_tx_change = 0x4;
	uint8_t offset = 0xA;
	uint8_t value = 0;
	int i = 0;
	bool i2c_success = false;
	DC_LOGGER_INIT(pipe_ctx->stream->ctx->logger);

	memset(&buffer, 0, sizeof(buffer));

	/* Start Ext-Hdmi programming*/

	for (i = 0; i < settings->reg_num; i++) {
		/* Apply 3G settings */
		if (settings->reg_settings[i].i2c_reg_index <= 0x20) {

			buffer[0] = settings->reg_settings[i].i2c_reg_index;
			buffer[1] = settings->reg_settings[i].i2c_reg_val;
			i2c_success = i2c_write(pipe_ctx, slave_address,
						buffer, sizeof(buffer));
			RETIMER_REDRIVER_INFO("retimer write to slave_address = 0x%x,\
				offset = 0x%x, reg_val= 0x%x, i2c_success = %d\n",
				slave_address, buffer[0], buffer[1], i2c_success?1:0);

			if (!i2c_success)
				goto i2c_write_fail;

			/* Based on DP159 specs, APPLY_RX_TX_CHANGE bit in 0x0A
			 * needs to be set to 1 on every 0xA-0xC write.
			 */
			if (settings->reg_settings[i].i2c_reg_index == 0xA ||
				settings->reg_settings[i].i2c_reg_index == 0xB ||
				settings->reg_settings[i].i2c_reg_index == 0xC) {

				/* Query current value from offset 0xA */
				if (settings->reg_settings[i].i2c_reg_index == 0xA)
					value = settings->reg_settings[i].i2c_reg_val;
				else {
					i2c_success =
						dal_ddc_service_query_ddc_data(
						pipe_ctx->stream->link->ddc,
						slave_address, &offset, 1, &value, 1);
					if (!i2c_success)
						goto i2c_write_fail;
				}

				buffer[0] = offset;
				/* Set APPLY_RX_TX_CHANGE bit to 1 */
				buffer[1] = value | apply_rx_tx_change;
				i2c_success = i2c_write(pipe_ctx, slave_address,
						buffer, sizeof(buffer));
				RETIMER_REDRIVER_INFO("retimer write to slave_address = 0x%x,\
					offset = 0x%x, reg_val = 0x%x, i2c_success = %d\n",
					slave_address, buffer[0], buffer[1], i2c_success?1:0);
				if (!i2c_success)
					goto i2c_write_fail;
			}
		}
	}

	/* Apply 3G settings */
	if (is_over_340mhz) {
		for (i = 0; i < settings->reg_num_6g; i++) {
			/* Apply 3G settings */
			if (settings->reg_settings[i].i2c_reg_index <= 0x20) {

				buffer[0] = settings->reg_settings_6g[i].i2c_reg_index;
				buffer[1] = settings->reg_settings_6g[i].i2c_reg_val;
				i2c_success = i2c_write(pipe_ctx, slave_address,
							buffer, sizeof(buffer));
				RETIMER_REDRIVER_INFO("above 340Mhz: retimer write to slave_address = 0x%x,\
					offset = 0x%x, reg_val = 0x%x, i2c_success = %d\n",
					slave_address, buffer[0], buffer[1], i2c_success?1:0);

				if (!i2c_success)
					goto i2c_write_fail;

				/* Based on DP159 specs, APPLY_RX_TX_CHANGE bit in 0x0A
				 * needs to be set to 1 on every 0xA-0xC write.
				 */
				if (settings->reg_settings_6g[i].i2c_reg_index == 0xA ||
					settings->reg_settings_6g[i].i2c_reg_index == 0xB ||
					settings->reg_settings_6g[i].i2c_reg_index == 0xC) {

					/* Query current value from offset 0xA */
					if (settings->reg_settings_6g[i].i2c_reg_index == 0xA)
						value = settings->reg_settings_6g[i].i2c_reg_val;
					else {
						i2c_success =
								dal_ddc_service_query_ddc_data(
								pipe_ctx->stream->link->ddc,
								slave_address, &offset, 1, &value, 1);
						if (!i2c_success)
							goto i2c_write_fail;
					}

					buffer[0] = offset;
					/* Set APPLY_RX_TX_CHANGE bit to 1 */
					buffer[1] = value | apply_rx_tx_change;
					i2c_success = i2c_write(pipe_ctx, slave_address,
							buffer, sizeof(buffer));
					RETIMER_REDRIVER_INFO("retimer write to slave_address = 0x%x,\
						offset = 0x%x, reg_val = 0x%x, i2c_success = %d\n",
						slave_address, buffer[0], buffer[1], i2c_success?1:0);
					if (!i2c_success)
						goto i2c_write_fail;
				}
			}
		}
	}

	if (is_vga_mode) {
		/* Program additional settings if using 640x480 resolution */

		/* Write offset 0xFF to 0x01 */
		buffer[0] = 0xff;
		buffer[1] = 0x01;
		i2c_success = i2c_write(pipe_ctx, slave_address,
				buffer, sizeof(buffer));
		RETIMER_REDRIVER_INFO("retimer write to slave_address = 0x%x,\
				offset = 0x%x, reg_val = 0x%x, i2c_success = %d\n",
				slave_address, buffer[0], buffer[1], i2c_success?1:0);
		if (!i2c_success)
			goto i2c_write_fail;

		/* Write offset 0x00 to 0x23 */
		buffer[0] = 0x00;
		buffer[1] = 0x23;
		i2c_success = i2c_write(pipe_ctx, slave_address,
				buffer, sizeof(buffer));
		RETIMER_REDRIVER_INFO("retimer write to slave_address = 0x%x,\
			offset = 0x%x, reg_val = 0x%x, i2c_success = %d\n",
			slave_address, buffer[0], buffer[1], i2c_success?1:0);
		if (!i2c_success)
			goto i2c_write_fail;

		/* Write offset 0xff to 0x00 */
		buffer[0] = 0xff;
		buffer[1] = 0x00;
		i2c_success = i2c_write(pipe_ctx, slave_address,
				buffer, sizeof(buffer));
		RETIMER_REDRIVER_INFO("retimer write to slave_address = 0x%x,\
			offset = 0x%x, reg_val = 0x%x, i2c_success = %d\n",
			slave_address, buffer[0], buffer[1], i2c_success?1:0);
		if (!i2c_success)
			goto i2c_write_fail;

	}

	return;

i2c_write_fail:
	DC_LOG_DEBUG("Set retimer failed");
}

static void write_i2c_default_retimer_setting(
		struct pipe_ctx *pipe_ctx,
		bool is_vga_mode,
		bool is_over_340mhz)
{
	uint8_t slave_address = (0xBA >> 1);
	uint8_t buffer[2];
	bool i2c_success = false;
	DC_LOGGER_INIT(pipe_ctx->stream->ctx->logger);

	memset(&buffer, 0, sizeof(buffer));

	/* Program Slave Address for tuning single integrity */
	/* Write offset 0x0A to 0x13 */
	buffer[0] = 0x0A;
	buffer[1] = 0x13;
	i2c_success = i2c_write(pipe_ctx, slave_address,
			buffer, sizeof(buffer));
	RETIMER_REDRIVER_INFO("retimer writes default setting to slave_address = 0x%x,\
		offset = 0x%x, reg_val = 0x%x, i2c_success = %d\n",
		slave_address, buffer[0], buffer[1], i2c_success?1:0);
	if (!i2c_success)
		goto i2c_write_fail;

	/* Write offset 0x0A to 0x17 */
	buffer[0] = 0x0A;
	buffer[1] = 0x17;
	i2c_success = i2c_write(pipe_ctx, slave_address,
			buffer, sizeof(buffer));
	RETIMER_REDRIVER_INFO("retimer write to slave_addr = 0x%x,\
		offset = 0x%x, reg_val = 0x%x, i2c_success = %d\n",
		slave_address, buffer[0], buffer[1], i2c_success?1:0);
	if (!i2c_success)
		goto i2c_write_fail;

	/* Write offset 0x0B to 0xDA or 0xD8 */
	buffer[0] = 0x0B;
	buffer[1] = is_over_340mhz ? 0xDA : 0xD8;
	i2c_success = i2c_write(pipe_ctx, slave_address,
			buffer, sizeof(buffer));
	RETIMER_REDRIVER_INFO("retimer write to slave_addr = 0x%x,\
		offset = 0x%x, reg_val = 0x%x, i2c_success = %d\n",
		slave_address, buffer[0], buffer[1], i2c_success?1:0);
	if (!i2c_success)
		goto i2c_write_fail;

	/* Write offset 0x0A to 0x17 */
	buffer[0] = 0x0A;
	buffer[1] = 0x17;
	i2c_success = i2c_write(pipe_ctx, slave_address,
			buffer, sizeof(buffer));
	RETIMER_REDRIVER_INFO("retimer write to slave_addr = 0x%x,\
		offset = 0x%x, reg_val= 0x%x, i2c_success = %d\n",
		slave_address, buffer[0], buffer[1], i2c_success?1:0);
	if (!i2c_success)
		goto i2c_write_fail;

	/* Write offset 0x0C to 0x1D or 0x91 */
	buffer[0] = 0x0C;
	buffer[1] = is_over_340mhz ? 0x1D : 0x91;
	i2c_success = i2c_write(pipe_ctx, slave_address,
			buffer, sizeof(buffer));
	RETIMER_REDRIVER_INFO("retimer write to slave_addr = 0x%x,\
		offset = 0x%x, reg_val = 0x%x, i2c_success = %d\n",
		slave_address, buffer[0], buffer[1], i2c_success?1:0);
	if (!i2c_success)
		goto i2c_write_fail;

	/* Write offset 0x0A to 0x17 */
	buffer[0] = 0x0A;
	buffer[1] = 0x17;
	i2c_success = i2c_write(pipe_ctx, slave_address,
			buffer, sizeof(buffer));
	RETIMER_REDRIVER_INFO("retimer write to slave_addr = 0x%x,\
		offset = 0x%x, reg_val = 0x%x, i2c_success = %d\n",
		slave_address, buffer[0], buffer[1], i2c_success?1:0);
	if (!i2c_success)
		goto i2c_write_fail;


	if (is_vga_mode) {
		/* Program additional settings if using 640x480 resolution */

		/* Write offset 0xFF to 0x01 */
		buffer[0] = 0xff;
		buffer[1] = 0x01;
		i2c_success = i2c_write(pipe_ctx, slave_address,
				buffer, sizeof(buffer));
		RETIMER_REDRIVER_INFO("retimer write to slave_addr = 0x%x,\
			offset = 0x%x, reg_val = 0x%x, i2c_success = %d\n",
			slave_address, buffer[0], buffer[1], i2c_success?1:0);
		if (!i2c_success)
			goto i2c_write_fail;

		/* Write offset 0x00 to 0x23 */
		buffer[0] = 0x00;
		buffer[1] = 0x23;
		i2c_success = i2c_write(pipe_ctx, slave_address,
				buffer, sizeof(buffer));
		RETIMER_REDRIVER_INFO("retimer write to slave_addr = 0x%x,\
			offset = 0x%x, reg_val= 0x%x, i2c_success = %d\n",
			slave_address, buffer[0], buffer[1], i2c_success?1:0);
		if (!i2c_success)
			goto i2c_write_fail;

		/* Write offset 0xff to 0x00 */
		buffer[0] = 0xff;
		buffer[1] = 0x00;
		i2c_success = i2c_write(pipe_ctx, slave_address,
				buffer, sizeof(buffer));
		RETIMER_REDRIVER_INFO("retimer write default setting to slave_addr = 0x%x,\
			offset = 0x%x, reg_val= 0x%x, i2c_success = %d end here\n",
			slave_address, buffer[0], buffer[1], i2c_success?1:0);
		if (!i2c_success)
			goto i2c_write_fail;
	}

	return;

i2c_write_fail:
	DC_LOG_DEBUG("Set default retimer failed");
}

static void write_i2c_redriver_setting(
		struct pipe_ctx *pipe_ctx,
		bool is_over_340mhz)
{
	uint8_t slave_address = (0xF0 >> 1);
	uint8_t buffer[16];
	bool i2c_success = false;
	DC_LOGGER_INIT(pipe_ctx->stream->ctx->logger);

	memset(&buffer, 0, sizeof(buffer));

	// Program Slave Address for tuning single integrity
	buffer[3] = 0x4E;
	buffer[4] = 0x4E;
	buffer[5] = 0x4E;
	buffer[6] = is_over_340mhz ? 0x4E : 0x4A;

	i2c_success = i2c_write(pipe_ctx, slave_address,
					buffer, sizeof(buffer));
	RETIMER_REDRIVER_INFO("redriver write 0 to all 16 reg offset expect following:\n\
		\t slave_addr = 0x%x, offset[3] = 0x%x, offset[4] = 0x%x,\
		offset[5] = 0x%x,offset[6] is_over_340mhz = 0x%x,\
		i2c_success = %d\n",
		slave_address, buffer[3], buffer[4], buffer[5], buffer[6], i2c_success?1:0);

	if (!i2c_success)
		DC_LOG_DEBUG("Set redriver failed");
}

static void disable_link(struct dc_link *link, const struct link_resource *link_res,
		enum signal_type signal)
{
	/*
	 * TODO: implement call for dp_set_hw_test_pattern
	 * it is needed for compliance testing
	 */

	/* Here we need to specify that encoder output settings
	 * need to be calculated as for the set mode,
	 * it will lead to querying dynamic link capabilities
	 * which should be done before enable output
	 */

	if (dc_is_dp_signal(signal)) {
		/* SST DP, eDP */
		struct dc_link_settings link_settings = link->cur_link_settings;
		if (dc_is_dp_sst_signal(signal))
			dp_disable_link_phy(link, link_res, signal);
		else
			dp_disable_link_phy_mst(link, link_res, signal);

		if (dc_is_dp_sst_signal(signal) ||
				link->mst_stream_alloc_table.stream_count == 0) {
			if (dp_get_link_encoding_format(&link_settings) == DP_8b_10b_ENCODING) {
				dp_set_fec_enable(link, false);
				dp_set_fec_ready(link, link_res, false);
			}
		}
	} else if (signal != SIGNAL_TYPE_VIRTUAL) {
		link->dc->hwss.disable_link_output(link, link_res, signal);
	}

	if (signal == SIGNAL_TYPE_DISPLAY_PORT_MST) {
		/* MST disable link only when no stream use the link */
		if (link->mst_stream_alloc_table.stream_count <= 0)
			link->link_status.link_active = false;
	} else {
		link->link_status.link_active = false;
	}
}

static void enable_link_hdmi(struct pipe_ctx *pipe_ctx)
{
	struct dc_stream_state *stream = pipe_ctx->stream;
	struct dc_link *link = stream->link;
	enum dc_color_depth display_color_depth;
	enum engine_id eng_id;
	struct ext_hdmi_settings settings = {0};
	bool is_over_340mhz = false;
	bool is_vga_mode = (stream->timing.h_addressable == 640)
			&& (stream->timing.v_addressable == 480);
	struct dc *dc = pipe_ctx->stream->ctx->dc;

	if (stream->phy_pix_clk == 0)
		stream->phy_pix_clk = stream->timing.pix_clk_100hz / 10;
	if (stream->phy_pix_clk > 340000)
		is_over_340mhz = true;

	if (dc_is_hdmi_signal(pipe_ctx->stream->signal)) {
		unsigned short masked_chip_caps = pipe_ctx->stream->link->chip_caps &
				EXT_DISPLAY_PATH_CAPS__EXT_CHIP_MASK;
		if (masked_chip_caps == EXT_DISPLAY_PATH_CAPS__HDMI20_TISN65DP159RSBT) {
			/* DP159, Retimer settings */
			eng_id = pipe_ctx->stream_res.stream_enc->id;

			if (get_ext_hdmi_settings(pipe_ctx, eng_id, &settings)) {
				write_i2c_retimer_setting(pipe_ctx,
						is_vga_mode, is_over_340mhz, &settings);
			} else {
				write_i2c_default_retimer_setting(pipe_ctx,
						is_vga_mode, is_over_340mhz);
			}
		} else if (masked_chip_caps == EXT_DISPLAY_PATH_CAPS__HDMI20_PI3EQX1204) {
			/* PI3EQX1204, Redriver settings */
			write_i2c_redriver_setting(pipe_ctx, is_over_340mhz);
		}
	}

	if (dc_is_hdmi_signal(pipe_ctx->stream->signal))
		dal_ddc_service_write_scdc_data(
			stream->link->ddc,
			stream->phy_pix_clk,
			stream->timing.flags.LTE_340MCSC_SCRAMBLE);

	memset(&stream->link->cur_link_settings, 0,
			sizeof(struct dc_link_settings));

	display_color_depth = stream->timing.display_color_depth;
	if (stream->timing.pixel_encoding == PIXEL_ENCODING_YCBCR422)
		display_color_depth = COLOR_DEPTH_888;

	dc->hwss.enable_tmds_link_output(
			link,
			&pipe_ctx->link_res,
			pipe_ctx->stream->signal,
			pipe_ctx->clock_source->id,
			display_color_depth,
			stream->phy_pix_clk);

	if (dc_is_hdmi_signal(pipe_ctx->stream->signal))
		dal_ddc_service_read_scdc_data(link->ddc);
}

static void enable_link_lvds(struct pipe_ctx *pipe_ctx)
{
	struct dc_stream_state *stream = pipe_ctx->stream;
	struct dc_link *link = stream->link;
	struct dc *dc = stream->ctx->dc;

	if (stream->phy_pix_clk == 0)
		stream->phy_pix_clk = stream->timing.pix_clk_100hz / 10;

	memset(&stream->link->cur_link_settings, 0,
			sizeof(struct dc_link_settings));
	dc->hwss.enable_lvds_link_output(
			link,
			&pipe_ctx->link_res,
			pipe_ctx->clock_source->id,
			stream->phy_pix_clk);

}

bool dc_power_alpm_dpcd_enable(struct dc_link *link, bool enable)
{
	bool ret = false;
	union dpcd_alpm_configuration alpm_config;

	if (link->psr_settings.psr_version == DC_PSR_VERSION_SU_1) {
		memset(&alpm_config, 0, sizeof(alpm_config));

		alpm_config.bits.ENABLE = (enable ? true : false);
		ret = dm_helpers_dp_write_dpcd(link->ctx, link,
				DP_RECEIVER_ALPM_CONFIG, &alpm_config.raw,
				sizeof(alpm_config.raw));
	}
	return ret;
}

/****************************enable_link***********************************/
static enum dc_status enable_link(
		struct dc_state *state,
		struct pipe_ctx *pipe_ctx)
{
	enum dc_status status = DC_ERROR_UNEXPECTED;
	struct dc_stream_state *stream = pipe_ctx->stream;
	struct dc_link *link = stream->link;

	/* There's some scenarios where driver is unloaded with display
	 * still enabled. When driver is reloaded, it may cause a display
	 * to not light up if there is a mismatch between old and new
	 * link settings. Need to call disable first before enabling at
	 * new link settings.
	 */
	if (link->link_status.link_active) {
		disable_link(link, &pipe_ctx->link_res, pipe_ctx->stream->signal);
	}

	switch (pipe_ctx->stream->signal) {
	case SIGNAL_TYPE_DISPLAY_PORT:
		status = enable_link_dp(state, pipe_ctx);
		break;
	case SIGNAL_TYPE_EDP:
		status = enable_link_edp(state, pipe_ctx);
		break;
	case SIGNAL_TYPE_DISPLAY_PORT_MST:
		status = enable_link_dp_mst(state, pipe_ctx);
		msleep(200);
		break;
	case SIGNAL_TYPE_DVI_SINGLE_LINK:
	case SIGNAL_TYPE_DVI_DUAL_LINK:
	case SIGNAL_TYPE_HDMI_TYPE_A:
		enable_link_hdmi(pipe_ctx);
		status = DC_OK;
		break;
	case SIGNAL_TYPE_LVDS:
		enable_link_lvds(pipe_ctx);
		status = DC_OK;
		break;
	case SIGNAL_TYPE_VIRTUAL:
		status = DC_OK;
		break;
	default:
		break;
	}

	if (status == DC_OK)
		pipe_ctx->stream->link->link_status.link_active = true;

	return status;
}

static uint32_t get_timing_pixel_clock_100hz(const struct dc_crtc_timing *timing)
{

	uint32_t pxl_clk = timing->pix_clk_100hz;

	if (timing->pixel_encoding == PIXEL_ENCODING_YCBCR420)
		pxl_clk /= 2;
	else if (timing->pixel_encoding == PIXEL_ENCODING_YCBCR422)
		pxl_clk = pxl_clk * 2 / 3;

	if (timing->display_color_depth == COLOR_DEPTH_101010)
		pxl_clk = pxl_clk * 10 / 8;
	else if (timing->display_color_depth == COLOR_DEPTH_121212)
		pxl_clk = pxl_clk * 12 / 8;

	return pxl_clk;
}

static bool dp_active_dongle_validate_timing(
		const struct dc_crtc_timing *timing,
		const struct dpcd_caps *dpcd_caps)
{
	const struct dc_dongle_caps *dongle_caps = &dpcd_caps->dongle_caps;

	switch (dpcd_caps->dongle_type) {
	case DISPLAY_DONGLE_DP_VGA_CONVERTER:
	case DISPLAY_DONGLE_DP_DVI_CONVERTER:
	case DISPLAY_DONGLE_DP_DVI_DONGLE:
		if (timing->pixel_encoding == PIXEL_ENCODING_RGB)
			return true;
		else
			return false;
	default:
		break;
	}

	if (dpcd_caps->dongle_type == DISPLAY_DONGLE_DP_HDMI_CONVERTER &&
			dongle_caps->extendedCapValid == true) {
		/* Check Pixel Encoding */
		switch (timing->pixel_encoding) {
		case PIXEL_ENCODING_RGB:
		case PIXEL_ENCODING_YCBCR444:
			break;
		case PIXEL_ENCODING_YCBCR422:
			if (!dongle_caps->is_dp_hdmi_ycbcr422_pass_through)
				return false;
			break;
		case PIXEL_ENCODING_YCBCR420:
			if (!dongle_caps->is_dp_hdmi_ycbcr420_pass_through)
				return false;
			break;
		default:
			/* Invalid Pixel Encoding*/
			return false;
		}

		switch (timing->display_color_depth) {
		case COLOR_DEPTH_666:
		case COLOR_DEPTH_888:
			/*888 and 666 should always be supported*/
			break;
		case COLOR_DEPTH_101010:
			if (dongle_caps->dp_hdmi_max_bpc < 10)
				return false;
			break;
		case COLOR_DEPTH_121212:
			if (dongle_caps->dp_hdmi_max_bpc < 12)
				return false;
			break;
		case COLOR_DEPTH_141414:
		case COLOR_DEPTH_161616:
		default:
			/* These color depths are currently not supported */
			return false;
		}

		/* Check 3D format */
		switch (timing->timing_3d_format) {
		case TIMING_3D_FORMAT_NONE:
		case TIMING_3D_FORMAT_FRAME_ALTERNATE:
			/*Only frame alternate 3D is supported on active dongle*/
			break;
		default:
			/*other 3D formats are not supported due to bad infoframe translation */
			return false;
		}

#if defined(CONFIG_DRM_AMD_DC_DCN)
		if (dongle_caps->dp_hdmi_frl_max_link_bw_in_kbps > 0) { // DP to HDMI FRL converter
			struct dc_crtc_timing outputTiming = *timing;

			if (timing->flags.DSC && !timing->dsc_cfg.is_frl)
				/* DP input has DSC, HDMI FRL output doesn't have DSC, remove DSC from output timing */
				outputTiming.flags.DSC = 0;
			if (dc_bandwidth_in_kbps_from_timing(&outputTiming) > dongle_caps->dp_hdmi_frl_max_link_bw_in_kbps)
				return false;
		} else { // DP to HDMI TMDS converter
			if (get_timing_pixel_clock_100hz(timing) > (dongle_caps->dp_hdmi_max_pixel_clk_in_khz * 10))
				return false;
		}
#else
		if (get_timing_pixel_clock_100hz(timing) > (dongle_caps->dp_hdmi_max_pixel_clk_in_khz * 10))
			return false;
#endif
	}

	if (dpcd_caps->channel_coding_cap.bits.DP_128b_132b_SUPPORTED == 0 &&
			dpcd_caps->dsc_caps.dsc_basic_caps.fields.dsc_support.DSC_PASSTHROUGH_SUPPORT == 0 &&
			dongle_caps->dfp_cap_ext.supported) {

		if (dongle_caps->dfp_cap_ext.max_pixel_rate_in_mps < (timing->pix_clk_100hz / 10000))
			return false;

		if (dongle_caps->dfp_cap_ext.max_video_h_active_width < timing->h_addressable)
			return false;

		if (dongle_caps->dfp_cap_ext.max_video_v_active_height < timing->v_addressable)
			return false;

		if (timing->pixel_encoding == PIXEL_ENCODING_RGB) {
			if (!dongle_caps->dfp_cap_ext.encoding_format_caps.support_rgb)
				return false;
			if (timing->display_color_depth == COLOR_DEPTH_666 &&
					!dongle_caps->dfp_cap_ext.rgb_color_depth_caps.support_6bpc)
				return false;
			else if (timing->display_color_depth == COLOR_DEPTH_888 &&
					!dongle_caps->dfp_cap_ext.rgb_color_depth_caps.support_8bpc)
				return false;
			else if (timing->display_color_depth == COLOR_DEPTH_101010 &&
					!dongle_caps->dfp_cap_ext.rgb_color_depth_caps.support_10bpc)
				return false;
			else if (timing->display_color_depth == COLOR_DEPTH_121212 &&
					!dongle_caps->dfp_cap_ext.rgb_color_depth_caps.support_12bpc)
				return false;
			else if (timing->display_color_depth == COLOR_DEPTH_161616 &&
					!dongle_caps->dfp_cap_ext.rgb_color_depth_caps.support_16bpc)
				return false;
		} else if (timing->pixel_encoding == PIXEL_ENCODING_YCBCR444) {
			if (!dongle_caps->dfp_cap_ext.encoding_format_caps.support_rgb)
				return false;
			if (timing->display_color_depth == COLOR_DEPTH_888 &&
					!dongle_caps->dfp_cap_ext.ycbcr444_color_depth_caps.support_8bpc)
				return false;
			else if (timing->display_color_depth == COLOR_DEPTH_101010 &&
					!dongle_caps->dfp_cap_ext.ycbcr444_color_depth_caps.support_10bpc)
				return false;
			else if (timing->display_color_depth == COLOR_DEPTH_121212 &&
					!dongle_caps->dfp_cap_ext.ycbcr444_color_depth_caps.support_12bpc)
				return false;
			else if (timing->display_color_depth == COLOR_DEPTH_161616 &&
					!dongle_caps->dfp_cap_ext.ycbcr444_color_depth_caps.support_16bpc)
				return false;
		} else if (timing->pixel_encoding == PIXEL_ENCODING_YCBCR422) {
			if (!dongle_caps->dfp_cap_ext.encoding_format_caps.support_rgb)
				return false;
			if (timing->display_color_depth == COLOR_DEPTH_888 &&
					!dongle_caps->dfp_cap_ext.ycbcr422_color_depth_caps.support_8bpc)
				return false;
			else if (timing->display_color_depth == COLOR_DEPTH_101010 &&
					!dongle_caps->dfp_cap_ext.ycbcr422_color_depth_caps.support_10bpc)
				return false;
			else if (timing->display_color_depth == COLOR_DEPTH_121212 &&
					!dongle_caps->dfp_cap_ext.ycbcr422_color_depth_caps.support_12bpc)
				return false;
			else if (timing->display_color_depth == COLOR_DEPTH_161616 &&
					!dongle_caps->dfp_cap_ext.ycbcr422_color_depth_caps.support_16bpc)
				return false;
		} else if (timing->pixel_encoding == PIXEL_ENCODING_YCBCR420) {
			if (!dongle_caps->dfp_cap_ext.encoding_format_caps.support_rgb)
				return false;
			if (timing->display_color_depth == COLOR_DEPTH_888 &&
					!dongle_caps->dfp_cap_ext.ycbcr420_color_depth_caps.support_8bpc)
				return false;
			else if (timing->display_color_depth == COLOR_DEPTH_101010 &&
					!dongle_caps->dfp_cap_ext.ycbcr420_color_depth_caps.support_10bpc)
				return false;
			else if (timing->display_color_depth == COLOR_DEPTH_121212 &&
					!dongle_caps->dfp_cap_ext.ycbcr420_color_depth_caps.support_12bpc)
				return false;
			else if (timing->display_color_depth == COLOR_DEPTH_161616 &&
					!dongle_caps->dfp_cap_ext.ycbcr420_color_depth_caps.support_16bpc)
				return false;
		}
	}

	return true;
}

enum dc_status dc_link_validate_mode_timing(
		const struct dc_stream_state *stream,
		struct dc_link *link,
		const struct dc_crtc_timing *timing)
{
	uint32_t max_pix_clk = stream->link->dongle_max_pix_clk * 10;
	struct dpcd_caps *dpcd_caps = &link->dpcd_caps;

	/* A hack to avoid failing any modes for EDID override feature on
	 * topology change such as lower quality cable for DP or different dongle
	 */
	if (link->remote_sinks[0] && link->remote_sinks[0]->sink_signal == SIGNAL_TYPE_VIRTUAL)
		return DC_OK;

	/* Passive Dongle */
	if (max_pix_clk != 0 && get_timing_pixel_clock_100hz(timing) > max_pix_clk)
		return DC_EXCEED_DONGLE_CAP;

	/* Active Dongle*/
	if (!dp_active_dongle_validate_timing(timing, dpcd_caps))
		return DC_EXCEED_DONGLE_CAP;

	switch (stream->signal) {
	case SIGNAL_TYPE_EDP:
	case SIGNAL_TYPE_DISPLAY_PORT:
		if (!dp_validate_mode_timing(
				link,
				timing))
			return DC_NO_DP_LINK_BANDWIDTH;
		break;

	default:
		break;
	}

	return DC_OK;
}

static struct abm *get_abm_from_stream_res(const struct dc_link *link)
{
	int i;
	struct dc *dc = NULL;
	struct abm *abm = NULL;

	if (!link || !link->ctx)
		return NULL;

	dc = link->ctx->dc;

	for (i = 0; i < MAX_PIPES; i++) {
		struct pipe_ctx pipe_ctx = dc->current_state->res_ctx.pipe_ctx[i];
		struct dc_stream_state *stream = pipe_ctx.stream;

		if (stream && stream->link == link) {
			abm = pipe_ctx.stream_res.abm;
			break;
		}
	}
	return abm;
}

int dc_link_get_backlight_level(const struct dc_link *link)
{
	struct abm *abm = get_abm_from_stream_res(link);
	struct panel_cntl *panel_cntl = link->panel_cntl;
	struct dc  *dc = link->ctx->dc;
	struct dmcu *dmcu = dc->res_pool->dmcu;
	bool fw_set_brightness = true;

	if (dmcu)
		fw_set_brightness = dmcu->funcs->is_dmcu_initialized(dmcu);

	if (!fw_set_brightness && panel_cntl->funcs->get_current_backlight)
		return panel_cntl->funcs->get_current_backlight(panel_cntl);
	else if (abm != NULL && abm->funcs->get_current_backlight != NULL)
		return (int) abm->funcs->get_current_backlight(abm);
	else
		return DC_ERROR_UNEXPECTED;
}

int dc_link_get_target_backlight_pwm(const struct dc_link *link)
{
	struct abm *abm = get_abm_from_stream_res(link);

	if (abm == NULL || abm->funcs->get_target_backlight == NULL)
		return DC_ERROR_UNEXPECTED;

	return (int) abm->funcs->get_target_backlight(abm);
}

static struct pipe_ctx *get_pipe_from_link(const struct dc_link *link)
{
	int i;
	struct dc *dc = link->ctx->dc;
	struct pipe_ctx *pipe_ctx = NULL;

	for (i = 0; i < MAX_PIPES; i++) {
		if (dc->current_state->res_ctx.pipe_ctx[i].stream) {
			if (dc->current_state->res_ctx.pipe_ctx[i].stream->link == link) {
				pipe_ctx = &dc->current_state->res_ctx.pipe_ctx[i];
				break;
			}
		}
	}

	return pipe_ctx;
}

bool dc_link_set_backlight_level(const struct dc_link *link,
		uint32_t backlight_pwm_u16_16,
		uint32_t frame_ramp)
{
	struct dc  *dc = link->ctx->dc;

	DC_LOGGER_INIT(link->ctx->logger);
	DC_LOG_BACKLIGHT("New Backlight level: %d (0x%X)\n",
			backlight_pwm_u16_16, backlight_pwm_u16_16);

	if (dc_is_embedded_signal(link->connector_signal)) {
		struct pipe_ctx *pipe_ctx = get_pipe_from_link(link);

		if (pipe_ctx) {
			/* Disable brightness ramping when the display is blanked
			 * as it can hang the DMCU
			 */
			if (pipe_ctx->plane_state == NULL)
				frame_ramp = 0;
		} else {
			return false;
		}

		dc->hwss.set_backlight_level(
				pipe_ctx,
				backlight_pwm_u16_16,
				frame_ramp);
	}
	return true;
}

bool dc_link_set_psr_allow_active(struct dc_link *link, const bool *allow_active,
		bool wait, bool force_static, const unsigned int *power_opts)
{
	struct dc  *dc = link->ctx->dc;
	struct dmcu *dmcu = dc->res_pool->dmcu;
	struct dmub_psr *psr = dc->res_pool->psr;
	unsigned int panel_inst;

	if (psr == NULL && force_static)
		return false;

	if (!dc_get_edp_link_panel_inst(dc, link, &panel_inst))
		return false;

	if ((allow_active != NULL) && (*allow_active == true) && (link->type == dc_connection_none)) {
		// Don't enter PSR if panel is not connected
		return false;
	}

	/* Set power optimization flag */
	if (power_opts && link->psr_settings.psr_power_opt != *power_opts) {
		link->psr_settings.psr_power_opt = *power_opts;

		if (psr != NULL && link->psr_settings.psr_feature_enabled && psr->funcs->psr_set_power_opt)
			psr->funcs->psr_set_power_opt(psr, link->psr_settings.psr_power_opt, panel_inst);
	}

	if (psr != NULL && link->psr_settings.psr_feature_enabled &&
			force_static && psr->funcs->psr_force_static)
		psr->funcs->psr_force_static(psr, panel_inst);

	/* Enable or Disable PSR */
	if (allow_active && link->psr_settings.psr_allow_active != *allow_active) {
		link->psr_settings.psr_allow_active = *allow_active;

		if (!link->psr_settings.psr_allow_active)
			dc_z10_restore(dc);

		if (psr != NULL && link->psr_settings.psr_feature_enabled) {
			psr->funcs->psr_enable(psr, link->psr_settings.psr_allow_active, wait, panel_inst);
		} else if ((dmcu != NULL && dmcu->funcs->is_dmcu_initialized(dmcu)) &&
			link->psr_settings.psr_feature_enabled)
			dmcu->funcs->set_psr_enable(dmcu, link->psr_settings.psr_allow_active, wait);
		else
			return false;
	}

	return true;
}

bool dc_link_get_psr_state(const struct dc_link *link, enum dc_psr_state *state)
{
	struct dc  *dc = link->ctx->dc;
	struct dmcu *dmcu = dc->res_pool->dmcu;
	struct dmub_psr *psr = dc->res_pool->psr;
	unsigned int panel_inst;

	if (!dc_get_edp_link_panel_inst(dc, link, &panel_inst))
		return false;

	if (psr != NULL && link->psr_settings.psr_feature_enabled)
		psr->funcs->psr_get_state(psr, state, panel_inst);
	else if (dmcu != NULL && link->psr_settings.psr_feature_enabled)
		dmcu->funcs->get_psr_state(dmcu, state);

	return true;
}

static inline enum physical_phy_id
transmitter_to_phy_id(enum transmitter transmitter_value)
{
	switch (transmitter_value) {
	case TRANSMITTER_UNIPHY_A:
		return PHYLD_0;
	case TRANSMITTER_UNIPHY_B:
		return PHYLD_1;
	case TRANSMITTER_UNIPHY_C:
		return PHYLD_2;
	case TRANSMITTER_UNIPHY_D:
		return PHYLD_3;
	case TRANSMITTER_UNIPHY_E:
		return PHYLD_4;
	case TRANSMITTER_UNIPHY_F:
		return PHYLD_5;
	case TRANSMITTER_NUTMEG_CRT:
		return PHYLD_6;
	case TRANSMITTER_TRAVIS_CRT:
		return PHYLD_7;
	case TRANSMITTER_TRAVIS_LCD:
		return PHYLD_8;
	case TRANSMITTER_UNIPHY_G:
		return PHYLD_9;
	case TRANSMITTER_COUNT:
		return PHYLD_COUNT;
	case TRANSMITTER_UNKNOWN:
		return PHYLD_UNKNOWN;
	default:
		WARN_ONCE(1, "Unknown transmitter value %d\n",
			  transmitter_value);
		return PHYLD_UNKNOWN;
	}
}

bool dc_link_setup_psr(struct dc_link *link,
		const struct dc_stream_state *stream, struct psr_config *psr_config,
		struct psr_context *psr_context)
{
	struct dc *dc;
	struct dmcu *dmcu;
	struct dmub_psr *psr;
	int i;
	unsigned int panel_inst;
	/* updateSinkPsrDpcdConfig*/
	union dpcd_psr_configuration psr_configuration;
	union dpcd_sink_active_vtotal_control_mode vtotal_control = {0};

	psr_context->controllerId = CONTROLLER_ID_UNDEFINED;

	if (!link)
		return false;

	dc = link->ctx->dc;
	dmcu = dc->res_pool->dmcu;
	psr = dc->res_pool->psr;

	if (!dmcu && !psr)
		return false;

	if (!dc_get_edp_link_panel_inst(dc, link, &panel_inst))
		return false;


	memset(&psr_configuration, 0, sizeof(psr_configuration));

	psr_configuration.bits.ENABLE                    = 1;
	psr_configuration.bits.CRC_VERIFICATION          = 1;
	psr_configuration.bits.FRAME_CAPTURE_INDICATION  =
			psr_config->psr_frame_capture_indication_req;

	/* Check for PSR v2*/
	if (link->psr_settings.psr_version == DC_PSR_VERSION_SU_1) {
		/* For PSR v2 selective update.
		 * Indicates whether sink should start capturing
		 * immediately following active scan line,
		 * or starting with the 2nd active scan line.
		 */
		psr_configuration.bits.LINE_CAPTURE_INDICATION = 0;
		/*For PSR v2, determines whether Sink should generate
		 * IRQ_HPD when CRC mismatch is detected.
		 */
		psr_configuration.bits.IRQ_HPD_WITH_CRC_ERROR    = 1;
		/* For PSR v2, set the bit when the Source device will
		 * be enabling PSR2 operation.
		 */
		psr_configuration.bits.ENABLE_PSR2    = 1;
		/* For PSR v2, the Sink device must be able to receive
		 * SU region updates early in the frame time.
		 */
		psr_configuration.bits.EARLY_TRANSPORT_ENABLE    = 1;
	}

	dm_helpers_dp_write_dpcd(
		link->ctx,
		link,
		368,
		&psr_configuration.raw,
		sizeof(psr_configuration.raw));

	if (link->psr_settings.psr_version == DC_PSR_VERSION_SU_1) {
		dc_power_alpm_dpcd_enable(link, true);
		psr_context->su_granularity_required =
			psr_config->su_granularity_required;
		psr_context->su_y_granularity =
			psr_config->su_y_granularity;
		psr_context->line_time_in_us =
			psr_config->line_time_in_us;

		if (link->psr_settings.psr_vtotal_control_support) {
			psr_context->rate_control_caps = psr_config->rate_control_caps;
			vtotal_control.bits.ENABLE = true;
			core_link_write_dpcd(link, DP_SINK_PSR_ACTIVE_VTOTAL_CONTROL_MODE,
							&vtotal_control.raw, sizeof(vtotal_control.raw));
		}
	}

	psr_context->channel = link->ddc->ddc_pin->hw_info.ddc_channel;
	psr_context->transmitterId = link->link_enc->transmitter;
	psr_context->engineId = link->link_enc->preferred_engine;

	for (i = 0; i < MAX_PIPES; i++) {
		if (dc->current_state->res_ctx.pipe_ctx[i].stream
				== stream) {
			/* dmcu -1 for all controller id values,
			 * therefore +1 here
			 */
			psr_context->controllerId =
				dc->current_state->res_ctx.
				pipe_ctx[i].stream_res.tg->inst + 1;
			break;
		}
	}

	/* Hardcoded for now.  Can be Pcie or Uniphy (or Unknown)*/
	psr_context->phyType = PHY_TYPE_UNIPHY;
	/*PhyId is associated with the transmitter id*/
	psr_context->smuPhyId =
		transmitter_to_phy_id(link->link_enc->transmitter);

	psr_context->crtcTimingVerticalTotal = stream->timing.v_total;
	psr_context->vsync_rate_hz = div64_u64(div64_u64((stream->
					timing.pix_clk_100hz * 100),
					stream->timing.v_total),
					stream->timing.h_total);

	psr_context->psrSupportedDisplayConfig = true;
	psr_context->psrExitLinkTrainingRequired =
		psr_config->psr_exit_link_training_required;
	psr_context->sdpTransmitLineNumDeadline =
		psr_config->psr_sdp_transmit_line_num_deadline;
	psr_context->psrFrameCaptureIndicationReq =
		psr_config->psr_frame_capture_indication_req;

	psr_context->skipPsrWaitForPllLock = 0; /* only = 1 in KV */

	psr_context->numberOfControllers =
			link->dc->res_pool->timing_generator_count;

	psr_context->rfb_update_auto_en = true;

	/* 2 frames before enter PSR. */
	psr_context->timehyst_frames = 2;
	/* half a frame
	 * (units in 100 lines, i.e. a value of 1 represents 100 lines)
	 */
	psr_context->hyst_lines = stream->timing.v_total / 2 / 100;
	psr_context->aux_repeats = 10;

	psr_context->psr_level.u32all = 0;

	/*skip power down the single pipe since it blocks the cstate*/
#if defined(CONFIG_DRM_AMD_DC_DCN)
	if (link->ctx->asic_id.chip_family >= FAMILY_RV) {
		switch(link->ctx->asic_id.chip_family) {
		case FAMILY_YELLOW_CARP:
		case AMDGPU_FAMILY_GC_10_3_6:
		case AMDGPU_FAMILY_GC_11_0_1:
			if (dc->debug.disable_z10 || dc->debug.psr_skip_crtc_disable)
				psr_context->psr_level.bits.SKIP_CRTC_DISABLE = true;
			break;
		default:
			psr_context->psr_level.bits.SKIP_CRTC_DISABLE = true;
			break;
		}
	}
#else
	if (link->ctx->asic_id.chip_family >= FAMILY_RV)
		psr_context->psr_level.bits.SKIP_CRTC_DISABLE = true;
#endif

	/* SMU will perform additional powerdown sequence.
	 * For unsupported ASICs, set psr_level flag to skip PSR
	 *  static screen notification to SMU.
	 *  (Always set for DAL2, did not check ASIC)
	 */
	psr_context->allow_smu_optimizations = psr_config->allow_smu_optimizations;
	psr_context->allow_multi_disp_optimizations = psr_config->allow_multi_disp_optimizations;

	/* Complete PSR entry before aborting to prevent intermittent
	 * freezes on certain eDPs
	 */
	psr_context->psr_level.bits.DISABLE_PSR_ENTRY_ABORT = 1;

	/* enable ALPM */
	psr_context->psr_level.bits.DISABLE_ALPM = 0;
	psr_context->psr_level.bits.ALPM_DEFAULT_PD_MODE = 1;

	/* Controls additional delay after remote frame capture before
	 * continuing power down, default = 0
	 */
	psr_context->frame_delay = 0;

	if (psr) {
		link->psr_settings.psr_feature_enabled = psr->funcs->psr_copy_settings(psr,
			link, psr_context, panel_inst);
		link->psr_settings.psr_power_opt = 0;
		link->psr_settings.psr_allow_active = 0;
	}
	else
		link->psr_settings.psr_feature_enabled = dmcu->funcs->setup_psr(dmcu, link, psr_context);

	/* psr_enabled == 0 indicates setup_psr did not succeed, but this
	 * should not happen since firmware should be running at this point
	 */
	if (link->psr_settings.psr_feature_enabled == 0)
		ASSERT(0);

	return true;

}

void dc_link_get_psr_residency(const struct dc_link *link, uint32_t *residency)
{
	struct dc  *dc = link->ctx->dc;
	struct dmub_psr *psr = dc->res_pool->psr;
	unsigned int panel_inst;

	if (!dc_get_edp_link_panel_inst(dc, link, &panel_inst))
		return;

	/* PSR residency measurements only supported on DMCUB */
	if (psr != NULL && link->psr_settings.psr_feature_enabled)
		psr->funcs->psr_get_residency(psr, residency, panel_inst);
	else
		*residency = 0;
}

bool dc_link_set_sink_vtotal_in_psr_active(const struct dc_link *link, uint16_t psr_vtotal_idle, uint16_t psr_vtotal_su)
{
	struct dc *dc = link->ctx->dc;
	struct dmub_psr *psr = dc->res_pool->psr;

	if (psr == NULL || !link->psr_settings.psr_feature_enabled || !link->psr_settings.psr_vtotal_control_support)
		return false;

	psr->funcs->psr_set_sink_vtotal_in_psr_active(psr, psr_vtotal_idle, psr_vtotal_su);

	return true;
}

const struct dc_link_status *dc_link_get_status(const struct dc_link *link)
{
	return &link->link_status;
}

void core_link_resume(struct dc_link *link)
{
	if (link->connector_signal != SIGNAL_TYPE_VIRTUAL)
		program_hpd_filter(link);
}

static struct fixed31_32 get_pbn_per_slot(struct dc_stream_state *stream)
{
	struct fixed31_32 mbytes_per_sec;
	uint32_t link_rate_in_mbytes_per_sec = dc_link_bandwidth_kbps(stream->link,
			&stream->link->cur_link_settings);
	link_rate_in_mbytes_per_sec /= 8000; /* Kbits to MBytes */

	mbytes_per_sec = dc_fixpt_from_int(link_rate_in_mbytes_per_sec);

	return dc_fixpt_div_int(mbytes_per_sec, 54);
}

static struct fixed31_32 get_pbn_from_bw_in_kbps(uint64_t kbps)
{
	struct fixed31_32 peak_kbps;
	uint32_t numerator = 0;
	uint32_t denominator = 1;

	/*
	 * margin 5300ppm + 300ppm ~ 0.6% as per spec, factor is 1.006
	 * The unit of 54/64Mbytes/sec is an arbitrary unit chosen based on
	 * common multiplier to render an integer PBN for all link rate/lane
	 * counts combinations
	 * calculate
	 * peak_kbps *= (1006/1000)
	 * peak_kbps *= (64/54)
	 * peak_kbps *= 8    convert to bytes
	 */

	numerator = 64 * PEAK_FACTOR_X1000;
	denominator = 54 * 8 * 1000 * 1000;
	kbps *= numerator;
	peak_kbps = dc_fixpt_from_fraction(kbps, denominator);

	return peak_kbps;
}

static struct fixed31_32 get_pbn_from_timing(struct pipe_ctx *pipe_ctx)
{
	uint64_t kbps;

	kbps = dc_bandwidth_in_kbps_from_timing(&pipe_ctx->stream->timing);
	return get_pbn_from_bw_in_kbps(kbps);
}

static void update_mst_stream_alloc_table(
	struct dc_link *link,
	struct stream_encoder *stream_enc,
	struct hpo_dp_stream_encoder *hpo_dp_stream_enc, // TODO: Rename stream_enc to dio_stream_enc?
	const struct dc_dp_mst_stream_allocation_table *proposed_table)
{
	struct link_mst_stream_allocation work_table[MAX_CONTROLLER_NUM] = { 0 };
	struct link_mst_stream_allocation *dc_alloc;

	int i;
	int j;

	/* if DRM proposed_table has more than one new payload */
	ASSERT(proposed_table->stream_count -
			link->mst_stream_alloc_table.stream_count < 2);

	/* copy proposed_table to link, add stream encoder */
	for (i = 0; i < proposed_table->stream_count; i++) {

		for (j = 0; j < link->mst_stream_alloc_table.stream_count; j++) {
			dc_alloc =
			&link->mst_stream_alloc_table.stream_allocations[j];

			if (dc_alloc->vcp_id ==
				proposed_table->stream_allocations[i].vcp_id) {

				work_table[i] = *dc_alloc;
				work_table[i].slot_count = proposed_table->stream_allocations[i].slot_count;
				break; /* exit j loop */
			}
		}

		/* new vcp_id */
		if (j == link->mst_stream_alloc_table.stream_count) {
			work_table[i].vcp_id =
				proposed_table->stream_allocations[i].vcp_id;
			work_table[i].slot_count =
				proposed_table->stream_allocations[i].slot_count;
			work_table[i].stream_enc = stream_enc;
			work_table[i].hpo_dp_stream_enc = hpo_dp_stream_enc;
		}
	}

	/* update link->mst_stream_alloc_table with work_table */
	link->mst_stream_alloc_table.stream_count =
			proposed_table->stream_count;
	for (i = 0; i < MAX_CONTROLLER_NUM; i++)
		link->mst_stream_alloc_table.stream_allocations[i] =
				work_table[i];
}

static void remove_stream_from_alloc_table(
		struct dc_link *link,
		struct stream_encoder *dio_stream_enc,
		struct hpo_dp_stream_encoder *hpo_dp_stream_enc)
{
	int i = 0;
	struct link_mst_stream_allocation_table *table =
			&link->mst_stream_alloc_table;

	if (hpo_dp_stream_enc) {
		for (; i < table->stream_count; i++)
			if (hpo_dp_stream_enc == table->stream_allocations[i].hpo_dp_stream_enc)
				break;
	} else {
		for (; i < table->stream_count; i++)
			if (dio_stream_enc == table->stream_allocations[i].stream_enc)
				break;
	}

	if (i < table->stream_count) {
		i++;
		for (; i < table->stream_count; i++)
			table->stream_allocations[i-1] = table->stream_allocations[i];
		memset(&table->stream_allocations[table->stream_count-1], 0,
				sizeof(struct link_mst_stream_allocation));
		table->stream_count--;
	}
}

static void dc_log_vcp_x_y(const struct dc_link *link, struct fixed31_32 avg_time_slots_per_mtp)
{
	const uint32_t VCP_Y_PRECISION = 1000;
	uint64_t vcp_x, vcp_y;

	// Add 0.5*(1/VCP_Y_PRECISION) to round up to decimal precision
	avg_time_slots_per_mtp = dc_fixpt_add(
			avg_time_slots_per_mtp, dc_fixpt_from_fraction(1, 2 * VCP_Y_PRECISION));

	vcp_x = dc_fixpt_floor(avg_time_slots_per_mtp);
	vcp_y = dc_fixpt_floor(
			dc_fixpt_mul_int(
				dc_fixpt_sub_int(avg_time_slots_per_mtp, dc_fixpt_floor(avg_time_slots_per_mtp)),
				VCP_Y_PRECISION));

	if (link->type == dc_connection_mst_branch)
		DC_LOG_DP2("MST Update Payload: set_throttled_vcp_size slot X.Y for MST stream "
				"X: %lld Y: %lld/%d", vcp_x, vcp_y, VCP_Y_PRECISION);
	else
		DC_LOG_DP2("SST Update Payload: set_throttled_vcp_size slot X.Y for SST stream "
				"X: %lld Y: %lld/%d", vcp_x, vcp_y, VCP_Y_PRECISION);
}

/*
 * Payload allocation/deallocation for SST introduced in DP2.0
 */
static enum dc_status dc_link_update_sst_payload(struct pipe_ctx *pipe_ctx,
						 bool allocate)
{
	struct dc_stream_state *stream = pipe_ctx->stream;
	struct dc_link *link = stream->link;
	struct link_mst_stream_allocation_table proposed_table = {0};
	struct fixed31_32 avg_time_slots_per_mtp;
	const struct dc_link_settings empty_link_settings = {0};
	const struct link_hwss *link_hwss = get_link_hwss(link, &pipe_ctx->link_res);
	DC_LOGGER_INIT(link->ctx->logger);

	/* slot X.Y for SST payload deallocate */
	if (!allocate) {
		avg_time_slots_per_mtp = dc_fixpt_from_int(0);

		dc_log_vcp_x_y(link, avg_time_slots_per_mtp);

		if (link_hwss->ext.set_throttled_vcp_size)
			link_hwss->ext.set_throttled_vcp_size(pipe_ctx,
					avg_time_slots_per_mtp);
		if (link_hwss->ext.set_hblank_min_symbol_width)
			link_hwss->ext.set_hblank_min_symbol_width(pipe_ctx,
					&empty_link_settings,
					avg_time_slots_per_mtp);
	}

	/* calculate VC payload and update branch with new payload allocation table*/
	if (!dpcd_write_128b_132b_sst_payload_allocation_table(
			stream,
			link,
			&proposed_table,
			allocate)) {
		DC_LOG_ERROR("SST Update Payload: Failed to update "
						"allocation table for "
						"pipe idx: %d\n",
						pipe_ctx->pipe_idx);
		return DC_FAIL_DP_PAYLOAD_ALLOCATION;
	}

	proposed_table.stream_allocations[0].hpo_dp_stream_enc = pipe_ctx->stream_res.hpo_dp_stream_enc;

	ASSERT(proposed_table.stream_count == 1);

	//TODO - DP2.0 Logging: Instead of hpo_dp_stream_enc pointer, log instance id
	DC_LOG_DP2("SST Update Payload: hpo_dp_stream_enc: %p      "
		"vcp_id: %d      "
		"slot_count: %d\n",
		(void *) proposed_table.stream_allocations[0].hpo_dp_stream_enc,
		proposed_table.stream_allocations[0].vcp_id,
		proposed_table.stream_allocations[0].slot_count);

	/* program DP source TX for payload */
	link_hwss->ext.update_stream_allocation_table(link, &pipe_ctx->link_res,
			&proposed_table);

	/* poll for ACT handled */
	if (!dpcd_poll_for_allocation_change_trigger(link)) {
		// Failures will result in blackscreen and errors logged
		BREAK_TO_DEBUGGER();
	}

	/* slot X.Y for SST payload allocate */
	if (allocate && dp_get_link_encoding_format(&link->cur_link_settings) ==
			DP_128b_132b_ENCODING) {
		avg_time_slots_per_mtp = calculate_sst_avg_time_slots_per_mtp(stream, link);

		dc_log_vcp_x_y(link, avg_time_slots_per_mtp);

		if (link_hwss->ext.set_throttled_vcp_size)
			link_hwss->ext.set_throttled_vcp_size(pipe_ctx,
					avg_time_slots_per_mtp);
		if (link_hwss->ext.set_hblank_min_symbol_width)
			link_hwss->ext.set_hblank_min_symbol_width(pipe_ctx,
					&link->cur_link_settings,
					avg_time_slots_per_mtp);
	}

	/* Always return DC_OK.
	 * If part of sequence fails, log failure(s) and show blackscreen
	 */
	return DC_OK;
}

/* convert link_mst_stream_alloc_table to dm dp_mst_stream_alloc_table
 * because stream_encoder is not exposed to dm
 */
enum dc_status dc_link_allocate_mst_payload(struct pipe_ctx *pipe_ctx)
{
	struct dc_stream_state *stream = pipe_ctx->stream;
	struct dc_link *link = stream->link;
	struct dc_dp_mst_stream_allocation_table proposed_table = {0};
	struct fixed31_32 avg_time_slots_per_mtp;
	struct fixed31_32 pbn;
	struct fixed31_32 pbn_per_slot;
	int i;
	enum act_return_status ret;
	const struct link_hwss *link_hwss = get_link_hwss(link, &pipe_ctx->link_res);
	DC_LOGGER_INIT(link->ctx->logger);

	/* enable_link_dp_mst already check link->enabled_stream_count
	 * and stream is in link->stream[]. This is called during set mode,
	 * stream_enc is available.
	 */

	/* get calculate VC payload for stream: stream_alloc */
	if (dm_helpers_dp_mst_write_payload_allocation_table(
		stream->ctx,
		stream,
		&proposed_table,
		true))
		update_mst_stream_alloc_table(
					link,
					pipe_ctx->stream_res.stream_enc,
					pipe_ctx->stream_res.hpo_dp_stream_enc,
					&proposed_table);
	else
		DC_LOG_WARNING("Failed to update"
				"MST allocation table for"
				"pipe idx:%d\n",
				pipe_ctx->pipe_idx);

	DC_LOG_MST("%s  "
			"stream_count: %d: \n ",
			__func__,
			link->mst_stream_alloc_table.stream_count);

	for (i = 0; i < MAX_CONTROLLER_NUM; i++) {
		DC_LOG_MST("stream_enc[%d]: %p      "
		"stream[%d].hpo_dp_stream_enc: %p      "
		"stream[%d].vcp_id: %d      "
		"stream[%d].slot_count: %d\n",
		i,
		(void *) link->mst_stream_alloc_table.stream_allocations[i].stream_enc,
		i,
		(void *) link->mst_stream_alloc_table.stream_allocations[i].hpo_dp_stream_enc,
		i,
		link->mst_stream_alloc_table.stream_allocations[i].vcp_id,
		i,
		link->mst_stream_alloc_table.stream_allocations[i].slot_count);
	}

	ASSERT(proposed_table.stream_count > 0);

	/* program DP source TX for payload */
	if (link_hwss->ext.update_stream_allocation_table == NULL ||
			dp_get_link_encoding_format(&link->cur_link_settings) == DP_UNKNOWN_ENCODING) {
		DC_LOG_ERROR("Failure: unknown encoding format\n");
		return DC_ERROR_UNEXPECTED;
	}

	link_hwss->ext.update_stream_allocation_table(link,
			&pipe_ctx->link_res,
			&link->mst_stream_alloc_table);

	/* send down message */
	ret = dm_helpers_dp_mst_poll_for_allocation_change_trigger(
			stream->ctx,
			stream);

	if (ret != ACT_LINK_LOST) {
		dm_helpers_dp_mst_send_payload_allocation(
				stream->ctx,
				stream,
				true);
	}

	/* slot X.Y for only current stream */
	pbn_per_slot = get_pbn_per_slot(stream);
	if (pbn_per_slot.value == 0) {
		DC_LOG_ERROR("Failure: pbn_per_slot==0 not allowed. Cannot continue, returning DC_UNSUPPORTED_VALUE.\n");
		return DC_UNSUPPORTED_VALUE;
	}
	pbn = get_pbn_from_timing(pipe_ctx);
	avg_time_slots_per_mtp = dc_fixpt_div(pbn, pbn_per_slot);

	dc_log_vcp_x_y(link, avg_time_slots_per_mtp);

	if (link_hwss->ext.set_throttled_vcp_size)
		link_hwss->ext.set_throttled_vcp_size(pipe_ctx, avg_time_slots_per_mtp);
	if (link_hwss->ext.set_hblank_min_symbol_width)
		link_hwss->ext.set_hblank_min_symbol_width(pipe_ctx,
				&link->cur_link_settings,
				avg_time_slots_per_mtp);

	return DC_OK;

}

enum dc_status dc_link_reduce_mst_payload(struct pipe_ctx *pipe_ctx, uint32_t bw_in_kbps)
{
	struct dc_stream_state *stream = pipe_ctx->stream;
	struct dc_link *link = stream->link;
	struct fixed31_32 avg_time_slots_per_mtp;
	struct fixed31_32 pbn;
	struct fixed31_32 pbn_per_slot;
	struct dc_dp_mst_stream_allocation_table proposed_table = {0};
	uint8_t i;
	const struct link_hwss *link_hwss = get_link_hwss(link, &pipe_ctx->link_res);
	DC_LOGGER_INIT(link->ctx->logger);

	/* decrease throttled vcp size */
	pbn_per_slot = get_pbn_per_slot(stream);
	pbn = get_pbn_from_bw_in_kbps(bw_in_kbps);
	avg_time_slots_per_mtp = dc_fixpt_div(pbn, pbn_per_slot);

	if (link_hwss->ext.set_throttled_vcp_size)
		link_hwss->ext.set_throttled_vcp_size(pipe_ctx, avg_time_slots_per_mtp);
	if (link_hwss->ext.set_hblank_min_symbol_width)
		link_hwss->ext.set_hblank_min_symbol_width(pipe_ctx,
				&link->cur_link_settings,
				avg_time_slots_per_mtp);

	/* send ALLOCATE_PAYLOAD sideband message with updated pbn */
	dm_helpers_dp_mst_send_payload_allocation(
			stream->ctx,
			stream,
			true);

	/* notify immediate branch device table update */
	if (dm_helpers_dp_mst_write_payload_allocation_table(
			stream->ctx,
			stream,
			&proposed_table,
			true)) {
		/* update mst stream allocation table software state */
		update_mst_stream_alloc_table(
				link,
				pipe_ctx->stream_res.stream_enc,
				pipe_ctx->stream_res.hpo_dp_stream_enc,
				&proposed_table);
	} else {
		DC_LOG_WARNING("Failed to update"
				"MST allocation table for"
				"pipe idx:%d\n",
				pipe_ctx->pipe_idx);
	}

	DC_LOG_MST("%s  "
			"stream_count: %d: \n ",
			__func__,
			link->mst_stream_alloc_table.stream_count);

	for (i = 0; i < MAX_CONTROLLER_NUM; i++) {
		DC_LOG_MST("stream_enc[%d]: %p      "
				"stream[%d].hpo_dp_stream_enc: %p      "
				"stream[%d].vcp_id: %d      "
				"stream[%d].slot_count: %d\n",
				i,
				(void *) link->mst_stream_alloc_table.stream_allocations[i].stream_enc,
				i,
				(void *) link->mst_stream_alloc_table.stream_allocations[i].hpo_dp_stream_enc,
				i,
				link->mst_stream_alloc_table.stream_allocations[i].vcp_id,
				i,
				link->mst_stream_alloc_table.stream_allocations[i].slot_count);
	}

	ASSERT(proposed_table.stream_count > 0);

	/* update mst stream allocation table hardware state */
	if (link_hwss->ext.update_stream_allocation_table == NULL ||
			dp_get_link_encoding_format(&link->cur_link_settings) == DP_UNKNOWN_ENCODING) {
		DC_LOG_ERROR("Failure: unknown encoding format\n");
		return DC_ERROR_UNEXPECTED;
	}

	link_hwss->ext.update_stream_allocation_table(link, &pipe_ctx->link_res,
			&link->mst_stream_alloc_table);

	/* poll for immediate branch device ACT handled */
	dm_helpers_dp_mst_poll_for_allocation_change_trigger(
			stream->ctx,
			stream);

	return DC_OK;
}

enum dc_status dc_link_increase_mst_payload(struct pipe_ctx *pipe_ctx, uint32_t bw_in_kbps)
{
	struct dc_stream_state *stream = pipe_ctx->stream;
	struct dc_link *link = stream->link;
	struct fixed31_32 avg_time_slots_per_mtp;
	struct fixed31_32 pbn;
	struct fixed31_32 pbn_per_slot;
	struct dc_dp_mst_stream_allocation_table proposed_table = {0};
	uint8_t i;
	enum act_return_status ret;
	const struct link_hwss *link_hwss = get_link_hwss(link, &pipe_ctx->link_res);
	DC_LOGGER_INIT(link->ctx->logger);

	/* notify immediate branch device table update */
	if (dm_helpers_dp_mst_write_payload_allocation_table(
				stream->ctx,
				stream,
				&proposed_table,
				true)) {
		/* update mst stream allocation table software state */
		update_mst_stream_alloc_table(
				link,
				pipe_ctx->stream_res.stream_enc,
				pipe_ctx->stream_res.hpo_dp_stream_enc,
				&proposed_table);
	}

	DC_LOG_MST("%s  "
			"stream_count: %d: \n ",
			__func__,
			link->mst_stream_alloc_table.stream_count);

	for (i = 0; i < MAX_CONTROLLER_NUM; i++) {
		DC_LOG_MST("stream_enc[%d]: %p      "
				"stream[%d].hpo_dp_stream_enc: %p      "
				"stream[%d].vcp_id: %d      "
				"stream[%d].slot_count: %d\n",
				i,
				(void *) link->mst_stream_alloc_table.stream_allocations[i].stream_enc,
				i,
				(void *) link->mst_stream_alloc_table.stream_allocations[i].hpo_dp_stream_enc,
				i,
				link->mst_stream_alloc_table.stream_allocations[i].vcp_id,
				i,
				link->mst_stream_alloc_table.stream_allocations[i].slot_count);
	}

	ASSERT(proposed_table.stream_count > 0);

	/* update mst stream allocation table hardware state */
	if (link_hwss->ext.update_stream_allocation_table == NULL ||
			dp_get_link_encoding_format(&link->cur_link_settings) == DP_UNKNOWN_ENCODING) {
		DC_LOG_ERROR("Failure: unknown encoding format\n");
		return DC_ERROR_UNEXPECTED;
	}

	link_hwss->ext.update_stream_allocation_table(link, &pipe_ctx->link_res,
			&link->mst_stream_alloc_table);

	/* poll for immediate branch device ACT handled */
	ret = dm_helpers_dp_mst_poll_for_allocation_change_trigger(
			stream->ctx,
			stream);

	if (ret != ACT_LINK_LOST) {
		/* send ALLOCATE_PAYLOAD sideband message with updated pbn */
		dm_helpers_dp_mst_send_payload_allocation(
				stream->ctx,
				stream,
				true);
	}

	/* increase throttled vcp size */
	pbn = get_pbn_from_bw_in_kbps(bw_in_kbps);
	pbn_per_slot = get_pbn_per_slot(stream);
	avg_time_slots_per_mtp = dc_fixpt_div(pbn, pbn_per_slot);

	if (link_hwss->ext.set_throttled_vcp_size)
		link_hwss->ext.set_throttled_vcp_size(pipe_ctx, avg_time_slots_per_mtp);
	if (link_hwss->ext.set_hblank_min_symbol_width)
		link_hwss->ext.set_hblank_min_symbol_width(pipe_ctx,
				&link->cur_link_settings,
				avg_time_slots_per_mtp);

	return DC_OK;
}

static enum dc_status deallocate_mst_payload(struct pipe_ctx *pipe_ctx)
{
	struct dc_stream_state *stream = pipe_ctx->stream;
	struct dc_link *link = stream->link;
	struct dc_dp_mst_stream_allocation_table proposed_table = {0};
	struct fixed31_32 avg_time_slots_per_mtp = dc_fixpt_from_int(0);
	int i;
	bool mst_mode = (link->type == dc_connection_mst_branch);
	/* adjust for drm changes*/
	bool update_drm_mst_state = true;
	const struct link_hwss *link_hwss = get_link_hwss(link, &pipe_ctx->link_res);
	const struct dc_link_settings empty_link_settings = {0};
	DC_LOGGER_INIT(link->ctx->logger);


	/* deallocate_mst_payload is called before disable link. When mode or
	 * disable/enable monitor, new stream is created which is not in link
	 * stream[] yet. For this, payload is not allocated yet, so de-alloc
	 * should not done. For new mode set, map_resources will get engine
	 * for new stream, so stream_enc->id should be validated until here.
	 */

	/* slot X.Y */
	if (link_hwss->ext.set_throttled_vcp_size)
		link_hwss->ext.set_throttled_vcp_size(pipe_ctx, avg_time_slots_per_mtp);
	if (link_hwss->ext.set_hblank_min_symbol_width)
		link_hwss->ext.set_hblank_min_symbol_width(pipe_ctx,
				&empty_link_settings,
				avg_time_slots_per_mtp);

	if (mst_mode || update_drm_mst_state) {
		/* when link is in mst mode, reply on mst manager to remove
		 * payload
		 */
		if (dm_helpers_dp_mst_write_payload_allocation_table(
				stream->ctx,
				stream,
				&proposed_table,
				false))

			update_mst_stream_alloc_table(
					link,
					pipe_ctx->stream_res.stream_enc,
					pipe_ctx->stream_res.hpo_dp_stream_enc,
					&proposed_table);
		else
			DC_LOG_WARNING("Failed to update"
					"MST allocation table for"
					"pipe idx:%d\n",
					pipe_ctx->pipe_idx);
	} else {
		/* when link is no longer in mst mode (mst hub unplugged),
		 * remove payload with default dc logic
		 */
		remove_stream_from_alloc_table(link, pipe_ctx->stream_res.stream_enc,
				pipe_ctx->stream_res.hpo_dp_stream_enc);
	}

	DC_LOG_MST("%s"
			"stream_count: %d: ",
			__func__,
			link->mst_stream_alloc_table.stream_count);

	for (i = 0; i < MAX_CONTROLLER_NUM; i++) {
		DC_LOG_MST("stream_enc[%d]: %p      "
		"stream[%d].hpo_dp_stream_enc: %p      "
		"stream[%d].vcp_id: %d      "
		"stream[%d].slot_count: %d\n",
		i,
		(void *) link->mst_stream_alloc_table.stream_allocations[i].stream_enc,
		i,
		(void *) link->mst_stream_alloc_table.stream_allocations[i].hpo_dp_stream_enc,
		i,
		link->mst_stream_alloc_table.stream_allocations[i].vcp_id,
		i,
		link->mst_stream_alloc_table.stream_allocations[i].slot_count);
	}

	/* update mst stream allocation table hardware state */
	if (link_hwss->ext.update_stream_allocation_table == NULL ||
			dp_get_link_encoding_format(&link->cur_link_settings) == DP_UNKNOWN_ENCODING) {
		DC_LOG_DEBUG("Unknown encoding format\n");
		return DC_ERROR_UNEXPECTED;
	}

	link_hwss->ext.update_stream_allocation_table(link, &pipe_ctx->link_res,
			&link->mst_stream_alloc_table);

	if (mst_mode) {
		dm_helpers_dp_mst_poll_for_allocation_change_trigger(
			stream->ctx,
			stream);

		if (!update_drm_mst_state)
			dm_helpers_dp_mst_send_payload_allocation(
				stream->ctx,
				stream,
				false);
	}

	if (update_drm_mst_state)
		dm_helpers_dp_mst_send_payload_allocation(
			stream->ctx,
			stream,
			false);

	return DC_OK;
}


#if defined(CONFIG_DRM_AMD_DC_HDCP)
static void update_psp_stream_config(struct pipe_ctx *pipe_ctx, bool dpms_off)
{
	struct cp_psp *cp_psp = &pipe_ctx->stream->ctx->cp_psp;
	struct link_encoder *link_enc = NULL;
	struct cp_psp_stream_config config = {0};
	enum dp_panel_mode panel_mode =
			dp_get_panel_mode(pipe_ctx->stream->link);

	if (cp_psp == NULL || cp_psp->funcs.update_stream_config == NULL)
		return;

	link_enc = link_enc_cfg_get_link_enc(pipe_ctx->stream->link);
	ASSERT(link_enc);
	if (link_enc == NULL)
		return;

	/* otg instance */
	config.otg_inst = (uint8_t) pipe_ctx->stream_res.tg->inst;

	/* dig front end */
	config.dig_fe = (uint8_t) pipe_ctx->stream_res.stream_enc->stream_enc_inst;

	/* stream encoder index */
	config.stream_enc_idx = pipe_ctx->stream_res.stream_enc->id - ENGINE_ID_DIGA;
	if (is_dp_128b_132b_signal(pipe_ctx))
		config.stream_enc_idx =
				pipe_ctx->stream_res.hpo_dp_stream_enc->id - ENGINE_ID_HPO_DP_0;

	/* dig back end */
	config.dig_be = pipe_ctx->stream->link->link_enc_hw_inst;

	/* link encoder index */
	config.link_enc_idx = link_enc->transmitter - TRANSMITTER_UNIPHY_A;
	if (is_dp_128b_132b_signal(pipe_ctx))
		config.link_enc_idx = pipe_ctx->link_res.hpo_dp_link_enc->inst;

	/* dio output index is dpia index for DPIA endpoint & dcio index by default */
	if (pipe_ctx->stream->link->ep_type == DISPLAY_ENDPOINT_USB4_DPIA)
		config.dio_output_idx = pipe_ctx->stream->link->link_id.enum_id - ENUM_ID_1;
	else
		config.dio_output_idx = link_enc->transmitter - TRANSMITTER_UNIPHY_A;


	/* phy index */
	config.phy_idx = resource_transmitter_to_phy_idx(
			pipe_ctx->stream->link->dc, link_enc->transmitter);
	if (pipe_ctx->stream->link->ep_type == DISPLAY_ENDPOINT_USB4_DPIA)
		/* USB4 DPIA doesn't use PHY in our soc, initialize it to 0 */
		config.phy_idx = 0;

	/* stream properties */
	config.assr_enabled = (panel_mode == DP_PANEL_MODE_EDP) ? 1 : 0;
	config.mst_enabled = (pipe_ctx->stream->signal ==
			SIGNAL_TYPE_DISPLAY_PORT_MST) ? 1 : 0;
	config.dp2_enabled = is_dp_128b_132b_signal(pipe_ctx) ? 1 : 0;
	config.usb4_enabled = (pipe_ctx->stream->link->ep_type == DISPLAY_ENDPOINT_USB4_DPIA) ?
			1 : 0;
	config.dpms_off = dpms_off;

	/* dm stream context */
	config.dm_stream_ctx = pipe_ctx->stream->dm_stream_context;

	cp_psp->funcs.update_stream_config(cp_psp->handle, &config);
}
#endif

static void fpga_dp_hpo_enable_link_and_stream(struct dc_state *state, struct pipe_ctx *pipe_ctx)
{
	struct dc *dc = pipe_ctx->stream->ctx->dc;
	struct dc_stream_state *stream = pipe_ctx->stream;
	struct link_mst_stream_allocation_table proposed_table = {0};
	struct fixed31_32 avg_time_slots_per_mtp;
	uint8_t req_slot_count = 0;
	uint8_t vc_id = 1; /// VC ID always 1 for SST
	struct dc_link_settings link_settings = pipe_ctx->link_config.dp_link_settings;
	const struct link_hwss *link_hwss = get_link_hwss(stream->link, &pipe_ctx->link_res);
	DC_LOGGER_INIT(pipe_ctx->stream->ctx->logger);

	stream->link->cur_link_settings = link_settings;

	if (link_hwss->ext.enable_dp_link_output)
		link_hwss->ext.enable_dp_link_output(stream->link, &pipe_ctx->link_res,
				stream->signal, pipe_ctx->clock_source->id,
				&link_settings);

#ifdef DIAGS_BUILD
	/* Workaround for FPGA HPO capture DP link data:
	 * HPO capture will set link to active mode
	 * This workaround is required to get a capture from start of frame
	 */
	if (!dc->debug.fpga_hpo_capture_en) {
		struct encoder_set_dp_phy_pattern_param params = {0};
		params.dp_phy_pattern = DP_TEST_PATTERN_VIDEO_MODE;

		/* Set link active */
		stream->link->hpo_dp_link_enc->funcs->set_link_test_pattern(
				stream->link->hpo_dp_link_enc,
				&params);
	}
#endif

	/* Enable DP_STREAM_ENC */
	dc->hwss.enable_stream(pipe_ctx);

	/* Set DPS PPS SDP (AKA "info frames") */
	if (pipe_ctx->stream->timing.flags.DSC) {
		dp_set_dsc_pps_sdp(pipe_ctx, true, true);
	}

	/* Allocate Payload */
	if ((stream->signal == SIGNAL_TYPE_DISPLAY_PORT_MST) && (state->stream_count > 1)) {
		// MST case
		uint8_t i;

		proposed_table.stream_count = state->stream_count;
		for (i = 0; i < state->stream_count; i++) {
			avg_time_slots_per_mtp = calculate_sst_avg_time_slots_per_mtp(state->streams[i], state->streams[i]->link);
			req_slot_count = dc_fixpt_ceil(avg_time_slots_per_mtp);
			proposed_table.stream_allocations[i].slot_count = req_slot_count;
			proposed_table.stream_allocations[i].vcp_id = i+1;
			/* NOTE: This makes assumption that pipe_ctx index is same as stream index */
			proposed_table.stream_allocations[i].hpo_dp_stream_enc = state->res_ctx.pipe_ctx[i].stream_res.hpo_dp_stream_enc;
		}
	} else {
		// SST case
		avg_time_slots_per_mtp = calculate_sst_avg_time_slots_per_mtp(stream, stream->link);
		req_slot_count = dc_fixpt_ceil(avg_time_slots_per_mtp);
		proposed_table.stream_count = 1; /// Always 1 stream for SST
		proposed_table.stream_allocations[0].slot_count = req_slot_count;
		proposed_table.stream_allocations[0].vcp_id = vc_id;
		proposed_table.stream_allocations[0].hpo_dp_stream_enc = pipe_ctx->stream_res.hpo_dp_stream_enc;
	}

	link_hwss->ext.update_stream_allocation_table(stream->link,
			&pipe_ctx->link_res,
			&proposed_table);

	if (link_hwss->ext.set_throttled_vcp_size)
		link_hwss->ext.set_throttled_vcp_size(pipe_ctx, avg_time_slots_per_mtp);

	dc->hwss.unblank_stream(pipe_ctx, &stream->link->cur_link_settings);
}

void core_link_enable_stream(
		struct dc_state *state,
		struct pipe_ctx *pipe_ctx)
{
	struct dc *dc = pipe_ctx->stream->ctx->dc;
	struct dc_stream_state *stream = pipe_ctx->stream;
	struct dc_link *link = stream->sink->link;
	enum dc_status status;
	struct link_encoder *link_enc;
	enum otg_out_mux_dest otg_out_dest = OUT_MUX_DIO;
	struct vpg *vpg = pipe_ctx->stream_res.stream_enc->vpg;
	const struct link_hwss *link_hwss = get_link_hwss(link, &pipe_ctx->link_res);

	if (is_dp_128b_132b_signal(pipe_ctx))
		vpg = pipe_ctx->stream_res.hpo_dp_stream_enc->vpg;

	DC_LOGGER_INIT(pipe_ctx->stream->ctx->logger);

	if (pipe_ctx->stream->sink) {
		if (pipe_ctx->stream->sink->sink_signal != SIGNAL_TYPE_VIRTUAL &&
			pipe_ctx->stream->sink->sink_signal != SIGNAL_TYPE_NONE) {
			DC_LOG_DC("%s pipe_ctx dispname=%s signal=%x\n", __func__,
			pipe_ctx->stream->sink->edid_caps.display_name,
			pipe_ctx->stream->signal);
		}
	}

	if (!IS_DIAG_DC(dc->ctx->dce_environment) &&
			dc_is_virtual_signal(pipe_ctx->stream->signal))
		return;

	link_enc = link_enc_cfg_get_link_enc(link);
	ASSERT(link_enc);

	if (!dc_is_virtual_signal(pipe_ctx->stream->signal)
			&& !is_dp_128b_132b_signal(pipe_ctx)) {
		if (link_enc)
			link_enc->funcs->setup(
				link_enc,
				pipe_ctx->stream->signal);
	}

	pipe_ctx->stream->link->link_state_valid = true;

	if (pipe_ctx->stream_res.tg->funcs->set_out_mux) {
		if (is_dp_128b_132b_signal(pipe_ctx))
			otg_out_dest = OUT_MUX_HPO_DP;
		else
			otg_out_dest = OUT_MUX_DIO;
		pipe_ctx->stream_res.tg->funcs->set_out_mux(pipe_ctx->stream_res.tg, otg_out_dest);
	}

	link_hwss->setup_stream_attribute(pipe_ctx);

	if (!IS_FPGA_MAXIMUS_DC(dc->ctx->dce_environment)) {
		bool apply_edp_fast_boot_optimization =
			pipe_ctx->stream->apply_edp_fast_boot_optimization;

		pipe_ctx->stream->apply_edp_fast_boot_optimization = false;

		// Enable VPG before building infoframe
		if (vpg && vpg->funcs->vpg_poweron)
			vpg->funcs->vpg_poweron(vpg);

		resource_build_info_frame(pipe_ctx);
		dc->hwss.update_info_frame(pipe_ctx);

		if (dc_is_dp_signal(pipe_ctx->stream->signal))
			dp_source_sequence_trace(link, DPCD_SOURCE_SEQ_AFTER_UPDATE_INFO_FRAME);

		/* Do not touch link on seamless boot optimization. */
		if (pipe_ctx->stream->apply_seamless_boot_optimization) {
			pipe_ctx->stream->dpms_off = false;

			/* Still enable stream features & audio on seamless boot for DP external displays */
			if (pipe_ctx->stream->signal == SIGNAL_TYPE_DISPLAY_PORT) {
				enable_stream_features(pipe_ctx);
				if (pipe_ctx->stream_res.audio != NULL) {
					pipe_ctx->stream_res.stream_enc->funcs->dp_audio_enable(pipe_ctx->stream_res.stream_enc);
					dc->hwss.enable_audio_stream(pipe_ctx);
				}
			}

#if defined(CONFIG_DRM_AMD_DC_HDCP)
			update_psp_stream_config(pipe_ctx, false);
#endif
			return;
		}

		/* eDP lit up by bios already, no need to enable again. */
		if (pipe_ctx->stream->signal == SIGNAL_TYPE_EDP &&
					apply_edp_fast_boot_optimization &&
					!pipe_ctx->stream->timing.flags.DSC &&
					!pipe_ctx->next_odm_pipe) {
			pipe_ctx->stream->dpms_off = false;
#if defined(CONFIG_DRM_AMD_DC_HDCP)
			update_psp_stream_config(pipe_ctx, false);
#endif
			return;
		}

		if (pipe_ctx->stream->dpms_off)
			return;

		/* Have to setup DSC before DIG FE and BE are connected (which happens before the
		 * link training). This is to make sure the bandwidth sent to DIG BE won't be
		 * bigger than what the link and/or DIG BE can handle. VBID[6]/CompressedStream_flag
		 * will be automatically set at a later time when the video is enabled
		 * (DP_VID_STREAM_EN = 1).
		 */
		if (pipe_ctx->stream->timing.flags.DSC) {
			if (dc_is_dp_signal(pipe_ctx->stream->signal) ||
				dc_is_virtual_signal(pipe_ctx->stream->signal))
			dp_set_dsc_enable(pipe_ctx, true);

		}

		status = enable_link(state, pipe_ctx);

		if (status != DC_OK) {
			DC_LOG_WARNING("enabling link %u failed: %d\n",
			pipe_ctx->stream->link->link_index,
			status);

			/* Abort stream enable *unless* the failure was due to
			 * DP link training - some DP monitors will recover and
			 * show the stream anyway. But MST displays can't proceed
			 * without link training.
			 */
			if (status != DC_FAIL_DP_LINK_TRAINING ||
					pipe_ctx->stream->signal == SIGNAL_TYPE_DISPLAY_PORT_MST) {
				if (false == stream->link->link_status.link_active)
					disable_link(stream->link, &pipe_ctx->link_res,
							pipe_ctx->stream->signal);
				BREAK_TO_DEBUGGER();
				return;
			}
		}

		/* turn off otg test pattern if enable */
		if (pipe_ctx->stream_res.tg->funcs->set_test_pattern)
			pipe_ctx->stream_res.tg->funcs->set_test_pattern(pipe_ctx->stream_res.tg,
					CONTROLLER_DP_TEST_PATTERN_VIDEOMODE,
					COLOR_DEPTH_UNDEFINED);

		/* This second call is needed to reconfigure the DIG
		 * as a workaround for the incorrect value being applied
		 * from transmitter control.
		 */
		if (!(dc_is_virtual_signal(pipe_ctx->stream->signal) ||
				is_dp_128b_132b_signal(pipe_ctx)))
			if (link_enc)
				link_enc->funcs->setup(
					link_enc,
					pipe_ctx->stream->signal);

		dc->hwss.enable_stream(pipe_ctx);

		/* Set DPS PPS SDP (AKA "info frames") */
		if (pipe_ctx->stream->timing.flags.DSC) {
			if (dc_is_dp_signal(pipe_ctx->stream->signal) ||
					dc_is_virtual_signal(pipe_ctx->stream->signal)) {
				dp_set_dsc_on_rx(pipe_ctx, true);
				dp_set_dsc_pps_sdp(pipe_ctx, true, true);
			}
		}

		if (pipe_ctx->stream->signal == SIGNAL_TYPE_DISPLAY_PORT_MST)
			dc_link_allocate_mst_payload(pipe_ctx);
		else if (pipe_ctx->stream->signal == SIGNAL_TYPE_DISPLAY_PORT &&
				is_dp_128b_132b_signal(pipe_ctx))
			dc_link_update_sst_payload(pipe_ctx, true);

		dc->hwss.unblank_stream(pipe_ctx,
			&pipe_ctx->stream->link->cur_link_settings);

		if (stream->sink_patches.delay_ignore_msa > 0)
			msleep(stream->sink_patches.delay_ignore_msa);

		if (dc_is_dp_signal(pipe_ctx->stream->signal))
			enable_stream_features(pipe_ctx);
#if defined(CONFIG_DRM_AMD_DC_HDCP)
		update_psp_stream_config(pipe_ctx, false);
#endif

		dc->hwss.enable_audio_stream(pipe_ctx);

	} else { // if (IS_FPGA_MAXIMUS_DC(dc->ctx->dce_environment))
		if (is_dp_128b_132b_signal(pipe_ctx))
			fpga_dp_hpo_enable_link_and_stream(state, pipe_ctx);
		if (dc_is_dp_signal(pipe_ctx->stream->signal) ||
				dc_is_virtual_signal(pipe_ctx->stream->signal))
			dp_set_dsc_enable(pipe_ctx, true);
	}

	if (dc_is_hdmi_signal(pipe_ctx->stream->signal)) {
		core_link_set_avmute(pipe_ctx, false);
	}
}

void core_link_disable_stream(struct pipe_ctx *pipe_ctx)
{
	struct dc  *dc = pipe_ctx->stream->ctx->dc;
	struct dc_stream_state *stream = pipe_ctx->stream;
	struct dc_link *link = stream->sink->link;
	struct vpg *vpg = pipe_ctx->stream_res.stream_enc->vpg;

	if (is_dp_128b_132b_signal(pipe_ctx))
		vpg = pipe_ctx->stream_res.hpo_dp_stream_enc->vpg;

	DC_LOGGER_INIT(pipe_ctx->stream->ctx->logger);

	if (pipe_ctx->stream->sink) {
		if (pipe_ctx->stream->sink->sink_signal != SIGNAL_TYPE_VIRTUAL &&
			pipe_ctx->stream->sink->sink_signal != SIGNAL_TYPE_NONE) {
			DC_LOG_DC("%s pipe_ctx dispname=%s signal=%x\n", __func__,
			pipe_ctx->stream->sink->edid_caps.display_name,
			pipe_ctx->stream->signal);
		}
	}

	if (!IS_DIAG_DC(dc->ctx->dce_environment) &&
			dc_is_virtual_signal(pipe_ctx->stream->signal))
		return;

	if (!pipe_ctx->stream->sink->edid_caps.panel_patch.skip_avmute) {
		if (dc_is_hdmi_signal(pipe_ctx->stream->signal))
			core_link_set_avmute(pipe_ctx, true);
	}

	dc->hwss.disable_audio_stream(pipe_ctx);

#if defined(CONFIG_DRM_AMD_DC_HDCP)
	update_psp_stream_config(pipe_ctx, true);
#endif
	dc->hwss.blank_stream(pipe_ctx);

	if (pipe_ctx->stream->signal == SIGNAL_TYPE_DISPLAY_PORT_MST)
		deallocate_mst_payload(pipe_ctx);
	else if (pipe_ctx->stream->signal == SIGNAL_TYPE_DISPLAY_PORT &&
			is_dp_128b_132b_signal(pipe_ctx))
		dc_link_update_sst_payload(pipe_ctx, false);

	if (dc_is_hdmi_signal(pipe_ctx->stream->signal)) {
		struct ext_hdmi_settings settings = {0};
		enum engine_id eng_id = pipe_ctx->stream_res.stream_enc->id;

		unsigned short masked_chip_caps = link->chip_caps &
				EXT_DISPLAY_PATH_CAPS__EXT_CHIP_MASK;
		//Need to inform that sink is going to use legacy HDMI mode.
		dal_ddc_service_write_scdc_data(
			link->ddc,
			165000,//vbios only handles 165Mhz.
			false);
		if (masked_chip_caps == EXT_DISPLAY_PATH_CAPS__HDMI20_TISN65DP159RSBT) {
			/* DP159, Retimer settings */
			if (get_ext_hdmi_settings(pipe_ctx, eng_id, &settings))
				write_i2c_retimer_setting(pipe_ctx,
						false, false, &settings);
			else
				write_i2c_default_retimer_setting(pipe_ctx,
						false, false);
		} else if (masked_chip_caps == EXT_DISPLAY_PATH_CAPS__HDMI20_PI3EQX1204) {
			/* PI3EQX1204, Redriver settings */
			write_i2c_redriver_setting(pipe_ctx, false);
		}
	}

	if (pipe_ctx->stream->signal == SIGNAL_TYPE_DISPLAY_PORT &&
			!is_dp_128b_132b_signal(pipe_ctx)) {

		/* In DP1.x SST mode, our encoder will go to TPS1
		 * when link is on but stream is off.
		 * Disabling link before stream will avoid exposing TPS1 pattern
		 * during the disable sequence as it will confuse some receivers
		 * state machine.
		 * In DP2 or MST mode, our encoder will stay video active
		 */
		disable_link(pipe_ctx->stream->link, &pipe_ctx->link_res, pipe_ctx->stream->signal);
		dc->hwss.disable_stream(pipe_ctx);
	} else {
		dc->hwss.disable_stream(pipe_ctx);
		disable_link(pipe_ctx->stream->link, &pipe_ctx->link_res, pipe_ctx->stream->signal);
	}

	if (pipe_ctx->stream->timing.flags.DSC) {
		if (dc_is_dp_signal(pipe_ctx->stream->signal))
			dp_set_dsc_enable(pipe_ctx, false);
	}
	if (is_dp_128b_132b_signal(pipe_ctx)) {
		if (pipe_ctx->stream_res.tg->funcs->set_out_mux)
			pipe_ctx->stream_res.tg->funcs->set_out_mux(pipe_ctx->stream_res.tg, OUT_MUX_DIO);
	}

	if (vpg && vpg->funcs->vpg_powerdown)
		vpg->funcs->vpg_powerdown(vpg);
}

void core_link_set_avmute(struct pipe_ctx *pipe_ctx, bool enable)
{
	struct dc  *dc = pipe_ctx->stream->ctx->dc;

	if (!dc_is_hdmi_signal(pipe_ctx->stream->signal))
		return;

	dc->hwss.set_avmute(pipe_ctx, enable);
}

/**
 *  dc_link_enable_hpd_filter:
 *     If enable is true, programs HPD filter on associated HPD line using
 *     delay_on_disconnect/delay_on_connect values dependent on
 *     link->connector_signal
 *
 *     If enable is false, programs HPD filter on associated HPD line with no
 *     delays on connect or disconnect
 *
 *  @link:   pointer to the dc link
 *  @enable: boolean specifying whether to enable hbd
 */
void dc_link_enable_hpd_filter(struct dc_link *link, bool enable)
{
	struct gpio *hpd;

	if (enable) {
		link->is_hpd_filter_disabled = false;
		program_hpd_filter(link);
	} else {
		link->is_hpd_filter_disabled = true;
		/* Obtain HPD handle */
		hpd = get_hpd_gpio(link->ctx->dc_bios, link->link_id, link->ctx->gpio_service);

		if (!hpd)
			return;

		/* Setup HPD filtering */
		if (dal_gpio_open(hpd, GPIO_MODE_INTERRUPT) == GPIO_RESULT_OK) {
			struct gpio_hpd_config config;

			config.delay_on_connect = 0;
			config.delay_on_disconnect = 0;

			dal_irq_setup_hpd_filter(hpd, &config);

			dal_gpio_close(hpd);
		} else {
			ASSERT_CRITICAL(false);
		}
		/* Release HPD handle */
		dal_gpio_destroy_irq(&hpd);
	}
}

void dc_link_set_drive_settings(struct dc *dc,
				struct link_training_settings *lt_settings,
				const struct dc_link *link)
{

	int i;
	struct link_resource link_res;

	for (i = 0; i < dc->link_count; i++)
		if (dc->links[i] == link)
			break;

	if (i >= dc->link_count)
		ASSERT_CRITICAL(false);

	dc_link_get_cur_link_res(link, &link_res);
	dc_link_dp_set_drive_settings(dc->links[i], &link_res, lt_settings);
}

void dc_link_set_preferred_link_settings(struct dc *dc,
					 struct dc_link_settings *link_setting,
					 struct dc_link *link)
{
	int i;
	struct pipe_ctx *pipe;
	struct dc_stream_state *link_stream;
	struct dc_link_settings store_settings = *link_setting;

	link->preferred_link_setting = store_settings;

	/* Retrain with preferred link settings only relevant for
	 * DP signal type
	 * Check for non-DP signal or if passive dongle present
	 */
	if (!dc_is_dp_signal(link->connector_signal) ||
		link->dongle_max_pix_clk > 0)
		return;

	for (i = 0; i < MAX_PIPES; i++) {
		pipe = &dc->current_state->res_ctx.pipe_ctx[i];
		if (pipe->stream && pipe->stream->link) {
			if (pipe->stream->link == link) {
				link_stream = pipe->stream;
				break;
			}
		}
	}

	/* Stream not found */
	if (i == MAX_PIPES)
		return;

	/* Cannot retrain link if backend is off */
	if (link_stream->dpms_off)
		return;

	if (decide_link_settings(link_stream, &store_settings))
		dp_retrain_link_dp_test(link, &store_settings, false);
}

void dc_link_set_preferred_training_settings(struct dc *dc,
						 struct dc_link_settings *link_setting,
						 struct dc_link_training_overrides *lt_overrides,
						 struct dc_link *link,
						 bool skip_immediate_retrain)
{
	if (lt_overrides != NULL)
		link->preferred_training_settings = *lt_overrides;
	else
		memset(&link->preferred_training_settings, 0, sizeof(link->preferred_training_settings));

	if (link_setting != NULL) {
		link->preferred_link_setting = *link_setting;
		if (dp_get_link_encoding_format(link_setting) == DP_128b_132b_ENCODING)
			/* TODO: add dc update for acquiring link res  */
			skip_immediate_retrain = true;
	} else {
		link->preferred_link_setting.lane_count = LANE_COUNT_UNKNOWN;
		link->preferred_link_setting.link_rate = LINK_RATE_UNKNOWN;
	}

	/* Retrain now, or wait until next stream update to apply */
	if (skip_immediate_retrain == false)
		dc_link_set_preferred_link_settings(dc, &link->preferred_link_setting, link);
}

void dc_link_enable_hpd(const struct dc_link *link)
{
	dc_link_dp_enable_hpd(link);
}

void dc_link_disable_hpd(const struct dc_link *link)
{
	dc_link_dp_disable_hpd(link);
}

void dc_link_set_test_pattern(struct dc_link *link,
			      enum dp_test_pattern test_pattern,
			      enum dp_test_pattern_color_space test_pattern_color_space,
			      const struct link_training_settings *p_link_settings,
			      const unsigned char *p_custom_pattern,
			      unsigned int cust_pattern_size)
{
	if (link != NULL)
		dc_link_dp_set_test_pattern(
			link,
			test_pattern,
			test_pattern_color_space,
			p_link_settings,
			p_custom_pattern,
			cust_pattern_size);
}

uint32_t dc_link_bandwidth_kbps(
	const struct dc_link *link,
	const struct dc_link_settings *link_setting)
{
	uint32_t total_data_bw_efficiency_x10000 = 0;
	uint32_t link_rate_per_lane_kbps = 0;

	switch (dp_get_link_encoding_format(link_setting)) {
	case DP_8b_10b_ENCODING:
		/* For 8b/10b encoding:
		 * link rate is defined in the unit of LINK_RATE_REF_FREQ_IN_KHZ per DP byte per lane.
		 * data bandwidth efficiency is 80% with additional 3% overhead if FEC is supported.
		 */
		link_rate_per_lane_kbps = link_setting->link_rate * LINK_RATE_REF_FREQ_IN_KHZ * BITS_PER_DP_BYTE;
		total_data_bw_efficiency_x10000 = DATA_EFFICIENCY_8b_10b_x10000;
		if (dc_link_should_enable_fec(link)) {
			total_data_bw_efficiency_x10000 /= 100;
			total_data_bw_efficiency_x10000 *= DATA_EFFICIENCY_8b_10b_FEC_EFFICIENCY_x100;
		}
		break;
	case DP_128b_132b_ENCODING:
		/* For 128b/132b encoding:
		 * link rate is defined in the unit of 10mbps per lane.
		 * total data bandwidth efficiency is always 96.71%.
		 */
		link_rate_per_lane_kbps = link_setting->link_rate * 10000;
		total_data_bw_efficiency_x10000 = DATA_EFFICIENCY_128b_132b_x10000;
		break;
	default:
		break;
	}

	/* overall effective link bandwidth = link rate per lane * lane count * total data bandwidth efficiency */
	return link_rate_per_lane_kbps * link_setting->lane_count / 10000 * total_data_bw_efficiency_x10000;
}

const struct dc_link_settings *dc_link_get_link_cap(
		const struct dc_link *link)
{
	if (link->preferred_link_setting.lane_count != LANE_COUNT_UNKNOWN &&
			link->preferred_link_setting.link_rate != LINK_RATE_UNKNOWN)
		return &link->preferred_link_setting;
	return &link->verified_link_cap;
}

void dc_link_overwrite_extended_receiver_cap(
		struct dc_link *link)
{
	dp_overwrite_extended_receiver_cap(link);
}

bool dc_link_is_fec_supported(const struct dc_link *link)
{
	/* TODO - use asic cap instead of link_enc->features
	 * we no longer know which link enc to use for this link before commit
	 */
	struct link_encoder *link_enc = NULL;

	link_enc = link_enc_cfg_get_link_enc(link);
	ASSERT(link_enc);

	return (dc_is_dp_signal(link->connector_signal) && link_enc &&
			link_enc->features.fec_supported &&
			link->dpcd_caps.fec_cap.bits.FEC_CAPABLE &&
			!IS_FPGA_MAXIMUS_DC(link->ctx->dce_environment));
}

bool dc_link_should_enable_fec(const struct dc_link *link)
{
	bool force_disable = false;

	if (link->fec_state == dc_link_fec_enabled)
		force_disable = false;
	else if (link->connector_signal != SIGNAL_TYPE_DISPLAY_PORT_MST &&
			link->local_sink &&
			link->local_sink->edid_caps.panel_patch.disable_fec)
		force_disable = true;
	else if (link->connector_signal == SIGNAL_TYPE_EDP
			&& (link->dpcd_caps.dsc_caps.dsc_basic_caps.fields.
			 dsc_support.DSC_SUPPORT == false
				|| link->panel_config.dsc.disable_dsc_edp
				|| !link->dc->caps.edp_dsc_support))
		force_disable = true;

	return !force_disable && dc_link_is_fec_supported(link);
}

uint32_t dc_bandwidth_in_kbps_from_timing(
		const struct dc_crtc_timing *timing)
{
	uint32_t bits_per_channel = 0;
	uint32_t kbps;

#if defined(CONFIG_DRM_AMD_DC_DCN)
	if (timing->flags.DSC)
		return dc_dsc_stream_bandwidth_in_kbps(timing,
				timing->dsc_cfg.bits_per_pixel,
				timing->dsc_cfg.num_slices_h,
				timing->dsc_cfg.is_dp);
#endif /* CONFIG_DRM_AMD_DC_DCN */

	switch (timing->display_color_depth) {
	case COLOR_DEPTH_666:
		bits_per_channel = 6;
		break;
	case COLOR_DEPTH_888:
		bits_per_channel = 8;
		break;
	case COLOR_DEPTH_101010:
		bits_per_channel = 10;
		break;
	case COLOR_DEPTH_121212:
		bits_per_channel = 12;
		break;
	case COLOR_DEPTH_141414:
		bits_per_channel = 14;
		break;
	case COLOR_DEPTH_161616:
		bits_per_channel = 16;
		break;
	default:
		ASSERT(bits_per_channel != 0);
		bits_per_channel = 8;
		break;
	}

	kbps = timing->pix_clk_100hz / 10;
	kbps *= bits_per_channel;

	if (timing->flags.Y_ONLY != 1) {
		/*Only YOnly make reduce bandwidth by 1/3 compares to RGB*/
		kbps *= 3;
		if (timing->pixel_encoding == PIXEL_ENCODING_YCBCR420)
			kbps /= 2;
		else if (timing->pixel_encoding == PIXEL_ENCODING_YCBCR422)
			kbps = kbps * 2 / 3;
	}

	return kbps;

}

void dc_link_get_cur_link_res(const struct dc_link *link,
		struct link_resource *link_res)
{
	int i;
	struct pipe_ctx *pipe = NULL;

	memset(link_res, 0, sizeof(*link_res));

	for (i = 0; i < MAX_PIPES; i++) {
		pipe = &link->dc->current_state->res_ctx.pipe_ctx[i];
		if (pipe->stream && pipe->stream->link && pipe->top_pipe == NULL) {
			if (pipe->stream->link == link) {
				*link_res = pipe->link_res;
				break;
			}
		}
	}

}

/**
 * dc_get_cur_link_res_map() - take a snapshot of current link resource allocation state
 * @dc: pointer to dc of the dm calling this
 * @map: a dc link resource snapshot defined internally to dc.
 *
 * DM needs to capture a snapshot of current link resource allocation mapping
 * and store it in its persistent storage.
 *
 * Some of the link resource is using first come first serve policy.
 * The allocation mapping depends on original hotplug order. This information
 * is lost after driver is loaded next time. The snapshot is used in order to
 * restore link resource to its previous state so user will get consistent
 * link capability allocation across reboot.
 *
 * Return: none (void function)
 *
 */
void dc_get_cur_link_res_map(const struct dc *dc, uint32_t *map)
{
	struct dc_link *link;
	uint32_t i;
	uint32_t hpo_dp_recycle_map = 0;

	*map = 0;

	if (dc->caps.dp_hpo) {
		for (i = 0; i < dc->caps.max_links; i++) {
			link = dc->links[i];
			if (link->link_status.link_active &&
					dp_get_link_encoding_format(&link->reported_link_cap) == DP_128b_132b_ENCODING &&
					dp_get_link_encoding_format(&link->cur_link_settings) != DP_128b_132b_ENCODING)
				/* hpo dp link encoder is considered as recycled, when RX reports 128b/132b encoding capability
				 * but current link doesn't use it.
				 */
				hpo_dp_recycle_map |= (1 << i);
		}
		*map |= (hpo_dp_recycle_map << LINK_RES_HPO_DP_REC_MAP__SHIFT);
	}
}

/**
 * dc_restore_link_res_map() - restore link resource allocation state from a snapshot
 * @dc: pointer to dc of the dm calling this
 * @map: a dc link resource snapshot defined internally to dc.
 *
 * DM needs to call this function after initial link detection on boot and
 * before first commit streams to restore link resource allocation state
 * from previous boot session.
 *
 * Some of the link resource is using first come first serve policy.
 * The allocation mapping depends on original hotplug order. This information
 * is lost after driver is loaded next time. The snapshot is used in order to
 * restore link resource to its previous state so user will get consistent
 * link capability allocation across reboot.
 *
 * Return: none (void function)
 *
 */
void dc_restore_link_res_map(const struct dc *dc, uint32_t *map)
{
	struct dc_link *link;
	uint32_t i;
	unsigned int available_hpo_dp_count;
	uint32_t hpo_dp_recycle_map = (*map & LINK_RES_HPO_DP_REC_MAP__MASK)
			>> LINK_RES_HPO_DP_REC_MAP__SHIFT;

	if (dc->caps.dp_hpo) {
		available_hpo_dp_count = dc->res_pool->hpo_dp_link_enc_count;
		/* remove excess 128b/132b encoding support for not recycled links */
		for (i = 0; i < dc->caps.max_links; i++) {
			if ((hpo_dp_recycle_map & (1 << i)) == 0) {
				link = dc->links[i];
				if (link->type != dc_connection_none &&
						dp_get_link_encoding_format(&link->verified_link_cap) == DP_128b_132b_ENCODING) {
					if (available_hpo_dp_count > 0)
						available_hpo_dp_count--;
					else
						/* remove 128b/132b encoding capability by limiting verified link rate to HBR3 */
						link->verified_link_cap.link_rate = LINK_RATE_HIGH3;
				}
			}
		}
		/* remove excess 128b/132b encoding support for recycled links */
		for (i = 0; i < dc->caps.max_links; i++) {
			if ((hpo_dp_recycle_map & (1 << i)) != 0) {
				link = dc->links[i];
				if (link->type != dc_connection_none &&
						dp_get_link_encoding_format(&link->verified_link_cap) == DP_128b_132b_ENCODING) {
					if (available_hpo_dp_count > 0)
						available_hpo_dp_count--;
					else
						/* remove 128b/132b encoding capability by limiting verified link rate to HBR3 */
						link->verified_link_cap.link_rate = LINK_RATE_HIGH3;
				}
			}
		}
	}
}
