drm/amd/display: Cleanup MST non-atomic code workaround

[why]
It is not correct to touch aconnector within atomic_check.

[How]
It was added as workaround before, and no longer needed.
Signed-off-by: Jerry (Fangzhi) Zuo <Jerry.Zuo@amd.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

@@ -2703,18 +2703,11 @@ create_stream_for_sink(struct amdgpu_dm_connector *aconnector,
 	drm_connector = &aconnector->base;
 
 	if (!aconnector->dc_sink) {
-		/*
-		 * Create dc_sink when necessary to MST
-		 * Don't apply fake_sink to MST
-		 */
-		if (aconnector->mst_port) {
-			dm_dp_mst_dc_sink_create(drm_connector);
-			return stream;
+		if (!aconnector->mst_port) {
+			sink = create_fake_sink(aconnector);
+			if (!sink)
+				return stream;
 		}
-
-		sink = create_fake_sink(aconnector);
-		if (!sink)
-			return stream;
 	} else {
 		sink = aconnector->dc_sink;
 	}

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c

@@ -205,40 +205,6 @@ static const struct drm_connector_funcs dm_dp_mst_connector_funcs = {
 	.atomic_get_property = amdgpu_dm_connector_atomic_get_property
 };
 
-void dm_dp_mst_dc_sink_create(struct drm_connector *connector)
-{
-	struct amdgpu_dm_connector *aconnector = to_amdgpu_dm_connector(connector);
-	struct dc_sink *dc_sink;
-	struct dc_sink_init_data init_params = {
-			.link = aconnector->dc_link,
-			.sink_signal = SIGNAL_TYPE_DISPLAY_PORT_MST };
-
-	/* FIXME none of this is safe. we shouldn't touch aconnector here in
-	 * atomic_check
-	 */
-
-	/*
-	 * TODO: Need to further figure out why ddc.algo is NULL while MST port exists
-	 */
-	if (!aconnector->port || !aconnector->port->aux.ddc.algo)
-		return;
-
-	ASSERT(aconnector->edid);
-
-	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);
-}
-
 static int dm_dp_mst_get_modes(struct drm_connector *connector)
 {
 	struct amdgpu_dm_connector *aconnector = to_amdgpu_dm_connector(connector);

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.h

@@ -31,6 +31,5 @@ struct amdgpu_dm_connector;
 
 void amdgpu_dm_initialize_dp_connector(struct amdgpu_display_manager *dm,
 				       struct amdgpu_dm_connector *aconnector);
-void dm_dp_mst_dc_sink_create(struct drm_connector *connector);
 
 #endif