drm/amd/display: Don't treat wb connector as physical in create_validate_stream_for_sink

Don't try to operate on a drm_wb_connector as an amdgpu_dm_connector.
While dereferencing aconnector->base will "work" it's wrong and
might lead to unknown bad things. Just... don't.

Reviewed-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Roman Li <roman.li@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

Author: Harry Wentland

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

@@ -7456,12 +7456,12 @@ static enum dc_status dm_validate_stream_and_context(struct dc *dc,
 }
 
 struct dc_stream_state *
-create_validate_stream_for_sink(struct amdgpu_dm_connector *aconnector,
+create_validate_stream_for_sink(struct drm_connector *connector,
 				const struct drm_display_mode *drm_mode,
 				const struct dm_connector_state *dm_state,
 				const struct dc_stream_state *old_stream)
 {
-	struct drm_connector *connector = &aconnector->base;
+	struct amdgpu_dm_connector *aconnector = NULL;
 	struct amdgpu_device *adev = drm_to_adev(connector->dev);
 	struct dc_stream_state *stream;
 	const struct drm_connector_state *drm_state = dm_state ? &dm_state->base : NULL;
@@ -7472,8 +7472,12 @@ create_validate_stream_for_sink(struct amdgpu_dm_connector *aconnector,
 	if (!dm_state)
 		return NULL;
 
-	if (aconnector->dc_link->connector_signal == SIGNAL_TYPE_HDMI_TYPE_A ||
-	    aconnector->dc_link->dpcd_caps.dongle_type == DISPLAY_DONGLE_DP_HDMI_CONVERTER)
+	if (connector->connector_type != DRM_MODE_CONNECTOR_WRITEBACK)
+		aconnector = to_amdgpu_dm_connector(connector);
+
+	if (aconnector &&
+	    (aconnector->dc_link->connector_signal == SIGNAL_TYPE_HDMI_TYPE_A ||
+	     aconnector->dc_link->dpcd_caps.dongle_type == DISPLAY_DONGLE_DP_HDMI_CONVERTER))
 		bpc_limit = 8;
 
 	do {
@@ -7485,10 +7489,11 @@ create_validate_stream_for_sink(struct amdgpu_dm_connector *aconnector,
 			break;
 		}
 
-		if (aconnector->base.connector_type == DRM_MODE_CONNECTOR_WRITEBACK)
+		dc_result = dc_validate_stream(adev->dm.dc, stream);
+
+		if (!aconnector) /* writeback connector */
 			return stream;
 
-		dc_result = dc_validate_stream(adev->dm.dc, stream);
 		if (dc_result == DC_OK && stream->signal == SIGNAL_TYPE_DISPLAY_PORT_MST)
 			dc_result = dm_dp_mst_is_port_support_mode(aconnector, stream);
 
@@ -7518,7 +7523,7 @@ create_validate_stream_for_sink(struct amdgpu_dm_connector *aconnector,
 				     __func__, __LINE__);
 
 		aconnector->force_yuv420_output = true;
-		stream = create_validate_stream_for_sink(aconnector, drm_mode,
+		stream = create_validate_stream_for_sink(connector, drm_mode,
 						dm_state, old_stream);
 		aconnector->force_yuv420_output = false;
 	}
@@ -7533,6 +7538,9 @@ enum drm_mode_status amdgpu_dm_connector_mode_valid(struct drm_connector *connec
 	struct dc_sink *dc_sink;
 	/* TODO: Unhardcode stream count */
 	struct dc_stream_state *stream;
+	/* we always have an amdgpu_dm_connector here since we got
+	 * here via the amdgpu_dm_connector_helper_funcs
+	 */
 	struct amdgpu_dm_connector *aconnector = to_amdgpu_dm_connector(connector);
 
 	if ((mode->flags & DRM_MODE_FLAG_INTERLACE) ||
@@ -7557,7 +7565,7 @@ enum drm_mode_status amdgpu_dm_connector_mode_valid(struct drm_connector *connec
 
 	drm_mode_set_crtcinfo(mode, 0);
 
-	stream = create_validate_stream_for_sink(aconnector, mode,
+	stream = create_validate_stream_for_sink(connector, mode,
 						 to_dm_connector_state(connector->state),
 						 NULL);
 	if (stream) {
@@ -10608,7 +10616,7 @@ static int dm_update_crtc_state(struct amdgpu_display_manager *dm,
 		if (!drm_atomic_crtc_needs_modeset(new_crtc_state))
 			goto skip_modeset;
 
-		new_stream = create_validate_stream_for_sink(aconnector,
+		new_stream = create_validate_stream_for_sink(connector,
 							     &new_crtc_state->mode,
 							     dm_new_conn_state,
 							     dm_old_crtc_state->stream);

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

@@ -996,7 +996,7 @@ int amdgpu_dm_process_dmub_set_config_sync(struct dc_context *ctx, unsigned int
 					struct set_config_cmd_payload *payload, enum set_config_status *operation_result);
 
 struct dc_stream_state *
-	create_validate_stream_for_sink(struct amdgpu_dm_connector *aconnector,
+	create_validate_stream_for_sink(struct drm_connector *connector,
 					const struct drm_display_mode *drm_mode,
 					const struct dm_connector_state *dm_state,
 					const struct dc_stream_state *old_stream);

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

@@ -1625,23 +1625,21 @@ int pre_validate_dsc(struct drm_atomic_state *state,
 
 		if (ind >= 0) {
 			struct drm_connector *connector;
-			struct amdgpu_dm_connector *aconnector;
 			struct drm_connector_state *drm_new_conn_state;
 			struct dm_connector_state *dm_new_conn_state;
 			struct dm_crtc_state *dm_old_crtc_state;
 
 			connector =
 				amdgpu_dm_find_first_crtc_matching_connector(state,
 									     state->crtcs[ind].ptr);
-			aconnector = to_amdgpu_dm_connector(connector);
 			drm_new_conn_state =
 				drm_atomic_get_new_connector_state(state,
-								   &aconnector->base);
+								   connector);
 			dm_new_conn_state = to_dm_connector_state(drm_new_conn_state);
 			dm_old_crtc_state = to_dm_crtc_state(state->crtcs[ind].old_state);
 
 			local_dc_state->streams[i] =
-				create_validate_stream_for_sink(aconnector,
+				create_validate_stream_for_sink(connector,
 								&state->crtcs[ind].new_state->mode,
 								dm_new_conn_state,
 								dm_old_crtc_state->stream);