drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c - pub/scm/linux/kernel/git/hyperv/linux - Git at Google

 /*
  * 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/version.h>
 #include <drm/drm_atomic_helper.h>
 #include "dm_services.h"
 #include "amdgpu.h"
 #include "amdgpu_dm.h"
 #include "amdgpu_dm_mst_types.h"

 #include "dc.h"
 #include "dm_helpers.h"

 #include "dc_link_ddc.h"

 /* #define TRACE_DPCD */

 #ifdef TRACE_DPCD
 #define SIDE_BAND_MSG(address) (address >= DP_SIDEBAND_MSG_DOWN_REQ_BASE && address < DP_SINK_COUNT_ESI)

 static inline char *side_band_msg_type_to_str(uint32_t address)
 {
 	static char str[10] = {0};

 	if (address < DP_SIDEBAND_MSG_UP_REP_BASE)
 		strcpy(str, "DOWN_REQ");
 	else if (address < DP_SIDEBAND_MSG_DOWN_REP_BASE)
 		strcpy(str, "UP_REP");
 	else if (address < DP_SIDEBAND_MSG_UP_REQ_BASE)
 		strcpy(str, "DOWN_REP");
 	else
 		strcpy(str, "UP_REQ");

 	return str;
 }

 static void log_dpcd(uint8_t type,
 		     uint32_t address,
 		     uint8_t *data,
 		     uint32_t size,
 		     bool res)
 {
 	DRM_DEBUG_KMS("Op: %s, addr: %04x, SideBand Msg: %s, Op res: %s\n",
 			(type == DP_AUX_NATIVE_READ) ||
 			(type == DP_AUX_I2C_READ) ?
 					"Read" : "Write",
 			address,
 			SIDE_BAND_MSG(address) ?
 					side_band_msg_type_to_str(address) : "Nop",
 			res ? "OK" : "Fail");

 	if (res) {
 		print_hex_dump(KERN_INFO, "Body: ", DUMP_PREFIX_NONE, 16, 1, data, size, false);
 	}
 }
 #endif

 static ssize_t dm_dp_aux_transfer(struct drm_dp_aux *aux,
 				  struct drm_dp_aux_msg *msg)
 {
 	ssize_t result = 0;
 	enum i2caux_transaction_action action;
 	enum aux_transaction_type type;

 	if (WARN_ON(msg->size > 16))
 		return -E2BIG;

 	switch (msg->request & ~DP_AUX_I2C_MOT) {
 	case DP_AUX_NATIVE_READ:
 		type = AUX_TRANSACTION_TYPE_DP;
 		action = I2CAUX_TRANSACTION_ACTION_DP_READ;

 		result = dc_link_aux_transfer(TO_DM_AUX(aux)->ddc_service,
 					      msg->address,
 					      &msg->reply,
 					      msg->buffer,
 					      msg->size,
 					      type,
 					      action);
 		break;
 	case DP_AUX_NATIVE_WRITE:
 		type = AUX_TRANSACTION_TYPE_DP;
 		action = I2CAUX_TRANSACTION_ACTION_DP_WRITE;

 		dc_link_aux_transfer(TO_DM_AUX(aux)->ddc_service,
 				     msg->address,
 				     &msg->reply,
 				     msg->buffer,
 				     msg->size,
 				     type,
 				     action);
 		result = msg->size;
 		break;
 	case DP_AUX_I2C_READ:
 		type = AUX_TRANSACTION_TYPE_I2C;
 		if (msg->request & DP_AUX_I2C_MOT)
 			action = I2CAUX_TRANSACTION_ACTION_I2C_READ_MOT;
 		else
 			action = I2CAUX_TRANSACTION_ACTION_I2C_READ;

 		result = dc_link_aux_transfer(TO_DM_AUX(aux)->ddc_service,
 					      msg->address,
 					      &msg->reply,
 					      msg->buffer,
 					      msg->size,
 					      type,
 					      action);
 		break;
 	case DP_AUX_I2C_WRITE:
 		type = AUX_TRANSACTION_TYPE_I2C;
 		if (msg->request & DP_AUX_I2C_MOT)
 			action = I2CAUX_TRANSACTION_ACTION_I2C_WRITE_MOT;
 		else
 			action = I2CAUX_TRANSACTION_ACTION_I2C_WRITE;

 		dc_link_aux_transfer(TO_DM_AUX(aux)->ddc_service,
 				     msg->address,
 				     &msg->reply,
 				     msg->buffer,
 				     msg->size,
 				     type,
 				     action);
 		result = msg->size;
 		break;
 	default:
 		return -EINVAL;
 	}

 #ifdef TRACE_DPCD
 	log_dpcd(msg->request,
 		 msg->address,
 		 msg->buffer,
 		 msg->size,
 		 r == DDC_RESULT_SUCESSFULL);
 #endif

 	if (result < 0) /* DC doesn't know about kernel error codes */
 		result = -EIO;

 	return result;
 }

 static enum drm_connector_status
 dm_dp_mst_detect(struct drm_connector *connector, bool force)
 {
 	struct amdgpu_dm_connector *aconnector = to_amdgpu_dm_connector(connector);
 	struct amdgpu_dm_connector *master = aconnector->mst_port;

 	enum drm_connector_status status =
 		drm_dp_mst_detect_port(
 			connector,
 			&master->mst_mgr,
 			aconnector->port);

 	return status;
 }

 static void
 dm_dp_mst_connector_destroy(struct drm_connector *connector)
 {
 	struct amdgpu_dm_connector *amdgpu_dm_connector = to_amdgpu_dm_connector(connector);
 	struct amdgpu_encoder *amdgpu_encoder = amdgpu_dm_connector->mst_encoder;

 	if (amdgpu_dm_connector->edid) {
 		kfree(amdgpu_dm_connector->edid);
 		amdgpu_dm_connector->edid = NULL;
 	}

 	drm_encoder_cleanup(&amdgpu_encoder->base);
 	kfree(amdgpu_encoder);
 	drm_connector_cleanup(connector);
 	kfree(amdgpu_dm_connector);
 }

 static const struct drm_connector_funcs dm_dp_mst_connector_funcs = {
 	.detect = dm_dp_mst_detect,
 	.fill_modes = drm_helper_probe_single_connector_modes,
 	.destroy = dm_dp_mst_connector_destroy,
 	.reset = amdgpu_dm_connector_funcs_reset,
 	.atomic_duplicate_state = amdgpu_dm_connector_atomic_duplicate_state,
 	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 	.atomic_set_property = amdgpu_dm_connector_atomic_set_property,
 	.atomic_get_property = amdgpu_dm_connector_atomic_get_property
 };

 static int dm_dp_mst_get_modes(struct drm_connector *connector)
 {
 	struct amdgpu_dm_connector *aconnector = to_amdgpu_dm_connector(connector);
 	int ret = 0;

 	if (!aconnector)
 		return drm_add_edid_modes(connector, NULL);

 	if (!aconnector->edid) {
 		struct edid *edid;
 		edid = drm_dp_mst_get_edid(connector, &aconnector->mst_port->mst_mgr, aconnector->port);

 		if (!edid) {
 			drm_connector_update_edid_property(
 				&aconnector->base,
 				NULL);
 			return ret;
 		}

 		aconnector->edid = edid;
 	}

 	if (!aconnector->dc_sink) {
 		struct dc_sink *dc_sink;
 		struct dc_sink_init_data init_params = {
 				.link = aconnector->dc_link,
 				.sink_signal = SIGNAL_TYPE_DISPLAY_PORT_MST };
 		dc_sink = dc_link_add_remote_sink(
 			aconnector->dc_link,
 			(uint8_t *)aconnector->edid,
 			(aconnector->edid->extensions + 1) * EDID_LENGTH,
 			&init_params);

 		dc_sink->priv = aconnector;
 		aconnector->dc_sink = dc_sink;

 		if (aconnector->dc_sink)
 			amdgpu_dm_update_freesync_caps(
 					connector, aconnector->edid);

 	}

 	drm_connector_update_edid_property(
 					&aconnector->base, aconnector->edid);

 	ret = drm_add_edid_modes(connector, aconnector->edid);

 	return ret;
 }

 static struct drm_encoder *dm_mst_best_encoder(struct drm_connector *connector)
 {
 	struct amdgpu_dm_connector *amdgpu_dm_connector = to_amdgpu_dm_connector(connector);

 	return &amdgpu_dm_connector->mst_encoder->base;
 }

 static const struct drm_connector_helper_funcs dm_dp_mst_connector_helper_funcs = {
 	.get_modes = dm_dp_mst_get_modes,
 	.mode_valid = amdgpu_dm_connector_mode_valid,
 	.best_encoder = dm_mst_best_encoder,
 };

 static void amdgpu_dm_encoder_destroy(struct drm_encoder *encoder)
 {
 	drm_encoder_cleanup(encoder);
 	kfree(encoder);
 }

 static const struct drm_encoder_funcs amdgpu_dm_encoder_funcs = {
 	.destroy = amdgpu_dm_encoder_destroy,
 };

 static struct amdgpu_encoder *
 dm_dp_create_fake_mst_encoder(struct amdgpu_dm_connector *connector)
 {
 	struct drm_device *dev = connector->base.dev;
 	struct amdgpu_device *adev = dev->dev_private;
 	struct amdgpu_encoder *amdgpu_encoder;
 	struct drm_encoder *encoder;

 	amdgpu_encoder = kzalloc(sizeof(*amdgpu_encoder), GFP_KERNEL);
 	if (!amdgpu_encoder)
 		return NULL;

 	encoder = &amdgpu_encoder->base;
 	encoder->possible_crtcs = amdgpu_dm_get_encoder_crtc_mask(adev);

 	drm_encoder_init(
 		dev,
 		&amdgpu_encoder->base,
 		&amdgpu_dm_encoder_funcs,
 		DRM_MODE_ENCODER_DPMST,
 		NULL);

 	drm_encoder_helper_add(encoder, &amdgpu_dm_encoder_helper_funcs);

 	return amdgpu_encoder;
 }

 static struct drm_connector *
 dm_dp_add_mst_connector(struct drm_dp_mst_topology_mgr *mgr,
 			struct drm_dp_mst_port *port,
 			const char *pathprop)
 {
 	struct amdgpu_dm_connector *master = container_of(mgr, struct amdgpu_dm_connector, mst_mgr);
 	struct drm_device *dev = master->base.dev;
 	struct amdgpu_device *adev = dev->dev_private;
 	struct amdgpu_dm_connector *aconnector;
 	struct drm_connector *connector;

 	aconnector = kzalloc(sizeof(*aconnector), GFP_KERNEL);
 	if (!aconnector)
 		return NULL;

 	connector = &aconnector->base;
 	aconnector->port = port;
 	aconnector->mst_port = master;

 	if (drm_connector_init(
 		dev,
 		connector,
 		&dm_dp_mst_connector_funcs,
 		DRM_MODE_CONNECTOR_DisplayPort)) {
 		kfree(aconnector);
 		return NULL;
 	}
 	drm_connector_helper_add(connector, &dm_dp_mst_connector_helper_funcs);

 	amdgpu_dm_connector_init_helper(
 		&adev->dm,
 		aconnector,
 		DRM_MODE_CONNECTOR_DisplayPort,
 		master->dc_link,
 		master->connector_id);

 	aconnector->mst_encoder = dm_dp_create_fake_mst_encoder(master);

 	/*
 	 * TODO: understand why this one is needed
 	 */
 	drm_object_attach_property(
 		&connector->base,
 		dev->mode_config.path_property,
 		0);
 	drm_object_attach_property(
 		&connector->base,
 		dev->mode_config.tile_property,
 		0);

 	drm_connector_set_path_property(connector, pathprop);

 	/*
 	 * Initialize connector state before adding the connectror to drm and
 	 * framebuffer lists
 	 */
 	amdgpu_dm_connector_funcs_reset(connector);

 	DRM_INFO("DM_MST: added connector: %p [id: %d] [master: %p]\n",
 			aconnector, connector->base.id, aconnector->mst_port);

 	DRM_DEBUG_KMS(":%d\n", connector->base.id);

 	return connector;
 }

 static void dm_dp_destroy_mst_connector(struct drm_dp_mst_topology_mgr *mgr,
 					struct drm_connector *connector)
 {
 	struct amdgpu_dm_connector *master = container_of(mgr, struct amdgpu_dm_connector, mst_mgr);
 	struct drm_device *dev = master->base.dev;
 	struct amdgpu_device *adev = dev->dev_private;
 	struct amdgpu_dm_connector *aconnector = to_amdgpu_dm_connector(connector);

 	DRM_INFO("DM_MST: Disabling connector: %p [id: %d] [master: %p]\n",
 				aconnector, connector->base.id, aconnector->mst_port);

 	aconnector->port = NULL;
 	if (aconnector->dc_sink) {
 		amdgpu_dm_update_freesync_caps(connector, NULL);
 		dc_link_remove_remote_sink(aconnector->dc_link, aconnector->dc_sink);
 		dc_sink_release(aconnector->dc_sink);
 		aconnector->dc_sink = NULL;
 	}

 	drm_connector_unregister(connector);
 	if (adev->mode_info.rfbdev)
 		drm_fb_helper_remove_one_connector(&adev->mode_info.rfbdev->helper, connector);
 	drm_connector_put(connector);
 }

 static void dm_dp_mst_hotplug(struct drm_dp_mst_topology_mgr *mgr)
 {
 	struct amdgpu_dm_connector *master = container_of(mgr, struct amdgpu_dm_connector, mst_mgr);
 	struct drm_device *dev = master->base.dev;

 	drm_kms_helper_hotplug_event(dev);
 }

 static void dm_dp_mst_register_connector(struct drm_connector *connector)
 {
 	struct drm_device *dev = connector->dev;
 	struct amdgpu_device *adev = dev->dev_private;

 	if (adev->mode_info.rfbdev)
 		drm_fb_helper_add_one_connector(&adev->mode_info.rfbdev->helper, connector);
 	else
 		DRM_ERROR("adev->mode_info.rfbdev is NULL\n");

 	drm_connector_register(connector);
 }

 static const struct drm_dp_mst_topology_cbs dm_mst_cbs = {
 	.add_connector = dm_dp_add_mst_connector,
 	.destroy_connector = dm_dp_destroy_mst_connector,
 	.hotplug = dm_dp_mst_hotplug,
 	.register_connector = dm_dp_mst_register_connector
 };

 void amdgpu_dm_initialize_dp_connector(struct amdgpu_display_manager *dm,
 				       struct amdgpu_dm_connector *aconnector)
 {
 	aconnector->dm_dp_aux.aux.name = "dmdc";
 	aconnector->dm_dp_aux.aux.dev = dm->adev->dev;
 	aconnector->dm_dp_aux.aux.transfer = dm_dp_aux_transfer;
 	aconnector->dm_dp_aux.ddc_service = aconnector->dc_link->ddc;

 	drm_dp_aux_register(&aconnector->dm_dp_aux.aux);
 	drm_dp_cec_register_connector(&aconnector->dm_dp_aux.aux,
 				      aconnector->base.name, dm->adev->dev);
 	aconnector->mst_mgr.cbs = &dm_mst_cbs;
 	drm_dp_mst_topology_mgr_init(
 		&aconnector->mst_mgr,
 		dm->adev->ddev,
 		&aconnector->dm_dp_aux.aux,
 		16,
 		4,
 		aconnector->connector_id);
 }
	/*
	* 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/version.h>
	#include <drm/drm_atomic_helper.h>
	#include "dm_services.h"
	#include "amdgpu.h"
	#include "amdgpu_dm.h"
	#include "amdgpu_dm_mst_types.h"

	#include "dc.h"
	#include "dm_helpers.h"

	#include "dc_link_ddc.h"

	/* #define TRACE_DPCD */

	#ifdef TRACE_DPCD
	#define SIDE_BAND_MSG(address) (address >= DP_SIDEBAND_MSG_DOWN_REQ_BASE && address < DP_SINK_COUNT_ESI)

	static inline char *side_band_msg_type_to_str(uint32_t address)
	{
	static char str[10] = {0};

	if (address < DP_SIDEBAND_MSG_UP_REP_BASE)
	strcpy(str, "DOWN_REQ");
	else if (address < DP_SIDEBAND_MSG_DOWN_REP_BASE)
	strcpy(str, "UP_REP");
	else if (address < DP_SIDEBAND_MSG_UP_REQ_BASE)
	strcpy(str, "DOWN_REP");
	else
	strcpy(str, "UP_REQ");

	return str;
	}

	static void log_dpcd(uint8_t type,
	uint32_t address,
	uint8_t *data,
	uint32_t size,
	bool res)
	{
	DRM_DEBUG_KMS("Op: %s, addr: %04x, SideBand Msg: %s, Op res: %s\n",
	(type == DP_AUX_NATIVE_READ) \|\|
	(type == DP_AUX_I2C_READ) ?
	"Read" : "Write",
	address,
	SIDE_BAND_MSG(address) ?
	side_band_msg_type_to_str(address) : "Nop",
	res ? "OK" : "Fail");

	if (res) {
	print_hex_dump(KERN_INFO, "Body: ", DUMP_PREFIX_NONE, 16, 1, data, size, false);
	}
	}
	#endif

	static ssize_t dm_dp_aux_transfer(struct drm_dp_aux *aux,
	struct drm_dp_aux_msg *msg)
	{
	ssize_t result = 0;
	enum i2caux_transaction_action action;
	enum aux_transaction_type type;

	if (WARN_ON(msg->size > 16))
	return -E2BIG;

	switch (msg->request & ~DP_AUX_I2C_MOT) {
	case DP_AUX_NATIVE_READ:
	type = AUX_TRANSACTION_TYPE_DP;
	action = I2CAUX_TRANSACTION_ACTION_DP_READ;

	result = dc_link_aux_transfer(TO_DM_AUX(aux)->ddc_service,
	msg->address,
	&msg->reply,
	msg->buffer,
	msg->size,
	type,
	action);
	break;
	case DP_AUX_NATIVE_WRITE:
	type = AUX_TRANSACTION_TYPE_DP;
	action = I2CAUX_TRANSACTION_ACTION_DP_WRITE;

	dc_link_aux_transfer(TO_DM_AUX(aux)->ddc_service,
	msg->address,
	&msg->reply,
	msg->buffer,
	msg->size,
	type,
	action);
	result = msg->size;
	break;
	case DP_AUX_I2C_READ:
	type = AUX_TRANSACTION_TYPE_I2C;
	if (msg->request & DP_AUX_I2C_MOT)
	action = I2CAUX_TRANSACTION_ACTION_I2C_READ_MOT;
	else
	action = I2CAUX_TRANSACTION_ACTION_I2C_READ;

	result = dc_link_aux_transfer(TO_DM_AUX(aux)->ddc_service,
	msg->address,
	&msg->reply,
	msg->buffer,
	msg->size,
	type,
	action);
	break;
	case DP_AUX_I2C_WRITE:
	type = AUX_TRANSACTION_TYPE_I2C;
	if (msg->request & DP_AUX_I2C_MOT)
	action = I2CAUX_TRANSACTION_ACTION_I2C_WRITE_MOT;
	else
	action = I2CAUX_TRANSACTION_ACTION_I2C_WRITE;

	dc_link_aux_transfer(TO_DM_AUX(aux)->ddc_service,
	msg->address,
	&msg->reply,
	msg->buffer,
	msg->size,
	type,
	action);
	result = msg->size;
	break;
	default:
	return -EINVAL;
	}

	#ifdef TRACE_DPCD
	log_dpcd(msg->request,
	msg->address,
	msg->buffer,
	msg->size,
	r == DDC_RESULT_SUCESSFULL);
	#endif

	if (result < 0) /* DC doesn't know about kernel error codes */
	result = -EIO;

	return result;
	}

	static enum drm_connector_status
	dm_dp_mst_detect(struct drm_connector *connector, bool force)
	{
	struct amdgpu_dm_connector *aconnector = to_amdgpu_dm_connector(connector);
	struct amdgpu_dm_connector *master = aconnector->mst_port;

	enum drm_connector_status status =
	drm_dp_mst_detect_port(
	connector,
	&master->mst_mgr,
	aconnector->port);

	return status;
	}

	static void
	dm_dp_mst_connector_destroy(struct drm_connector *connector)
	{
	struct amdgpu_dm_connector *amdgpu_dm_connector = to_amdgpu_dm_connector(connector);
	struct amdgpu_encoder *amdgpu_encoder = amdgpu_dm_connector->mst_encoder;

	if (amdgpu_dm_connector->edid) {
	kfree(amdgpu_dm_connector->edid);
	amdgpu_dm_connector->edid = NULL;
	}

	drm_encoder_cleanup(&amdgpu_encoder->base);
	kfree(amdgpu_encoder);
	drm_connector_cleanup(connector);
	kfree(amdgpu_dm_connector);
	}

	static const struct drm_connector_funcs dm_dp_mst_connector_funcs = {
	.detect = dm_dp_mst_detect,
	.fill_modes = drm_helper_probe_single_connector_modes,
	.destroy = dm_dp_mst_connector_destroy,
	.reset = amdgpu_dm_connector_funcs_reset,
	.atomic_duplicate_state = amdgpu_dm_connector_atomic_duplicate_state,
	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
	.atomic_set_property = amdgpu_dm_connector_atomic_set_property,
	.atomic_get_property = amdgpu_dm_connector_atomic_get_property
	};

	static int dm_dp_mst_get_modes(struct drm_connector *connector)
	{
	struct amdgpu_dm_connector *aconnector = to_amdgpu_dm_connector(connector);
	int ret = 0;

	if (!aconnector)
	return drm_add_edid_modes(connector, NULL);

	if (!aconnector->edid) {
	struct edid *edid;
	edid = drm_dp_mst_get_edid(connector, &aconnector->mst_port->mst_mgr, aconnector->port);

	if (!edid) {
	drm_connector_update_edid_property(
	&aconnector->base,
	NULL);
	return ret;
	}

	aconnector->edid = edid;
	}

	if (!aconnector->dc_sink) {
	struct dc_sink *dc_sink;
	struct dc_sink_init_data init_params = {
	.link = aconnector->dc_link,
	.sink_signal = SIGNAL_TYPE_DISPLAY_PORT_MST };
	dc_sink = dc_link_add_remote_sink(
	aconnector->dc_link,
	(uint8_t *)aconnector->edid,
	(aconnector->edid->extensions + 1) * EDID_LENGTH,
	&init_params);

	dc_sink->priv = aconnector;
	aconnector->dc_sink = dc_sink;

	if (aconnector->dc_sink)
	amdgpu_dm_update_freesync_caps(
	connector, aconnector->edid);

	}

	drm_connector_update_edid_property(
	&aconnector->base, aconnector->edid);

	ret = drm_add_edid_modes(connector, aconnector->edid);

	return ret;
	}

	static struct drm_encoder dm_mst_best_encoder(struct drm_connector connector)
	{
	struct amdgpu_dm_connector *amdgpu_dm_connector = to_amdgpu_dm_connector(connector);

	return &amdgpu_dm_connector->mst_encoder->base;
	}

	static const struct drm_connector_helper_funcs dm_dp_mst_connector_helper_funcs = {
	.get_modes = dm_dp_mst_get_modes,
	.mode_valid = amdgpu_dm_connector_mode_valid,
	.best_encoder = dm_mst_best_encoder,
	};

	static void amdgpu_dm_encoder_destroy(struct drm_encoder *encoder)
	{
	drm_encoder_cleanup(encoder);
	kfree(encoder);
	}

	static const struct drm_encoder_funcs amdgpu_dm_encoder_funcs = {
	.destroy = amdgpu_dm_encoder_destroy,
	};

	static struct amdgpu_encoder *
	dm_dp_create_fake_mst_encoder(struct amdgpu_dm_connector *connector)
	{
	struct drm_device *dev = connector->base.dev;
	struct amdgpu_device *adev = dev->dev_private;
	struct amdgpu_encoder *amdgpu_encoder;
	struct drm_encoder *encoder;

	amdgpu_encoder = kzalloc(sizeof(*amdgpu_encoder), GFP_KERNEL);
	if (!amdgpu_encoder)
	return NULL;

	encoder = &amdgpu_encoder->base;
	encoder->possible_crtcs = amdgpu_dm_get_encoder_crtc_mask(adev);

	drm_encoder_init(
	dev,
	&amdgpu_encoder->base,
	&amdgpu_dm_encoder_funcs,
	DRM_MODE_ENCODER_DPMST,
	NULL);

	drm_encoder_helper_add(encoder, &amdgpu_dm_encoder_helper_funcs);

	return amdgpu_encoder;
	}

	static struct drm_connector *
	dm_dp_add_mst_connector(struct drm_dp_mst_topology_mgr *mgr,
	struct drm_dp_mst_port *port,
	const char *pathprop)
	{
	struct amdgpu_dm_connector *master = container_of(mgr, struct amdgpu_dm_connector, mst_mgr);
	struct drm_device *dev = master->base.dev;
	struct amdgpu_device *adev = dev->dev_private;
	struct amdgpu_dm_connector *aconnector;
	struct drm_connector *connector;

	aconnector = kzalloc(sizeof(*aconnector), GFP_KERNEL);
	if (!aconnector)
	return NULL;

	connector = &aconnector->base;
	aconnector->port = port;
	aconnector->mst_port = master;

	if (drm_connector_init(
	dev,
	connector,
	&dm_dp_mst_connector_funcs,
	DRM_MODE_CONNECTOR_DisplayPort)) {
	kfree(aconnector);
	return NULL;
	}
	drm_connector_helper_add(connector, &dm_dp_mst_connector_helper_funcs);

	amdgpu_dm_connector_init_helper(
	&adev->dm,
	aconnector,
	DRM_MODE_CONNECTOR_DisplayPort,
	master->dc_link,
	master->connector_id);

	aconnector->mst_encoder = dm_dp_create_fake_mst_encoder(master);

	/*
	* TODO: understand why this one is needed
	*/
	drm_object_attach_property(
	&connector->base,
	dev->mode_config.path_property,
	0);
	drm_object_attach_property(
	&connector->base,
	dev->mode_config.tile_property,
	0);

	drm_connector_set_path_property(connector, pathprop);

	/*
	* Initialize connector state before adding the connectror to drm and
	* framebuffer lists
	*/
	amdgpu_dm_connector_funcs_reset(connector);

	DRM_INFO("DM_MST: added connector: %p [id: %d] [master: %p]\n",
	aconnector, connector->base.id, aconnector->mst_port);

	DRM_DEBUG_KMS(":%d\n", connector->base.id);

	return connector;
	}

	static void dm_dp_destroy_mst_connector(struct drm_dp_mst_topology_mgr *mgr,
	struct drm_connector *connector)
	{
	struct amdgpu_dm_connector *master = container_of(mgr, struct amdgpu_dm_connector, mst_mgr);
	struct drm_device *dev = master->base.dev;
	struct amdgpu_device *adev = dev->dev_private;
	struct amdgpu_dm_connector *aconnector = to_amdgpu_dm_connector(connector);

	DRM_INFO("DM_MST: Disabling connector: %p [id: %d] [master: %p]\n",
	aconnector, connector->base.id, aconnector->mst_port);

	aconnector->port = NULL;
	if (aconnector->dc_sink) {
	amdgpu_dm_update_freesync_caps(connector, NULL);
	dc_link_remove_remote_sink(aconnector->dc_link, aconnector->dc_sink);
	dc_sink_release(aconnector->dc_sink);
	aconnector->dc_sink = NULL;
	}

	drm_connector_unregister(connector);
	if (adev->mode_info.rfbdev)
	drm_fb_helper_remove_one_connector(&adev->mode_info.rfbdev->helper, connector);
	drm_connector_put(connector);
	}

	static void dm_dp_mst_hotplug(struct drm_dp_mst_topology_mgr *mgr)
	{
	struct amdgpu_dm_connector *master = container_of(mgr, struct amdgpu_dm_connector, mst_mgr);
	struct drm_device *dev = master->base.dev;

	drm_kms_helper_hotplug_event(dev);
	}

	static void dm_dp_mst_register_connector(struct drm_connector *connector)
	{
	struct drm_device *dev = connector->dev;
	struct amdgpu_device *adev = dev->dev_private;

	if (adev->mode_info.rfbdev)
	drm_fb_helper_add_one_connector(&adev->mode_info.rfbdev->helper, connector);
	else
	DRM_ERROR("adev->mode_info.rfbdev is NULL\n");

	drm_connector_register(connector);
	}

	static const struct drm_dp_mst_topology_cbs dm_mst_cbs = {
	.add_connector = dm_dp_add_mst_connector,
	.destroy_connector = dm_dp_destroy_mst_connector,
	.hotplug = dm_dp_mst_hotplug,
	.register_connector = dm_dp_mst_register_connector
	};

	void amdgpu_dm_initialize_dp_connector(struct amdgpu_display_manager *dm,
	struct amdgpu_dm_connector *aconnector)
	{
	aconnector->dm_dp_aux.aux.name = "dmdc";
	aconnector->dm_dp_aux.aux.dev = dm->adev->dev;
	aconnector->dm_dp_aux.aux.transfer = dm_dp_aux_transfer;
	aconnector->dm_dp_aux.ddc_service = aconnector->dc_link->ddc;

	drm_dp_aux_register(&aconnector->dm_dp_aux.aux);
	drm_dp_cec_register_connector(&aconnector->dm_dp_aux.aux,
	aconnector->base.name, dm->adev->dev);
	aconnector->mst_mgr.cbs = &dm_mst_cbs;
	drm_dp_mst_topology_mgr_init(
	&aconnector->mst_mgr,
	dm->adev->ddev,
	&aconnector->dm_dp_aux.aux,
	16,
	4,
	aconnector->connector_id);
	}