drm/amd/display: Skip writeback connector when we get amdgpu_dm_connector

[WHY]
Writeback connectors are based on a different object:
drm_writeback_connector, and are therefore different from
amdgpu_dm_connector. We need to be careful to ensure code
designed for amdgpu_dm_connector doesn't inadvertently try
to operate on a drm_writeback_connector.

[HOW]
Skip them when connector type is DRM_MODE_CONNECTOR_WRITEBACK.
Reviewed-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -726,6 +726,10 @@ static void dmub_hpd_callback(struct amdgpu_device *adev,
 
 	drm_connector_list_iter_begin(dev, &iter);
 	drm_for_each_connector_iter(connector, &iter) {
+
+		if (connector->connector_type == DRM_MODE_CONNECTOR_WRITEBACK)
+			continue;
+
 		aconnector = to_amdgpu_dm_connector(connector);
 		if (link && aconnector->dc_link == link) {
 			if (notify->type == DMUB_NOTIFICATION_HPD)
@@ -950,6 +954,10 @@ static int amdgpu_dm_audio_component_get_eld(struct device *kdev, int port,
 
 	drm_connector_list_iter_begin(dev, &conn_iter);
 	drm_for_each_connector_iter(connector, &conn_iter) {
+
+		if (connector->connector_type == DRM_MODE_CONNECTOR_WRITEBACK)
+			continue;
+
 		aconnector = to_amdgpu_dm_connector(connector);
 		if (aconnector->audio_inst != port)
 			continue;
@@ -2291,6 +2299,10 @@ static int detect_mst_link_for_all_connectors(struct drm_device *dev)
 
 	drm_connector_list_iter_begin(dev, &iter);
 	drm_for_each_connector_iter(connector, &iter) {
+
+		if (connector->connector_type == DRM_MODE_CONNECTOR_WRITEBACK)
+			continue;
+
 		aconnector = to_amdgpu_dm_connector(connector);
 		if (aconnector->dc_link->type == dc_connection_mst_branch &&
 		    aconnector->mst_mgr.aux) {
@@ -2419,6 +2431,10 @@ static void s3_handle_mst(struct drm_device *dev, bool suspend)
 
 	drm_connector_list_iter_begin(dev, &iter);
 	drm_for_each_connector_iter(connector, &iter) {
+
+		if (connector->connector_type == DRM_MODE_CONNECTOR_WRITEBACK)
+			continue;
+
 		aconnector = to_amdgpu_dm_connector(connector);
 		if (aconnector->dc_link->type != dc_connection_mst_branch ||
 		    aconnector->mst_root)
@@ -2945,6 +2961,10 @@ static int dm_resume(void *handle)
 	/* Do detection*/
 	drm_connector_list_iter_begin(ddev, &iter);
 	drm_for_each_connector_iter(connector, &iter) {
+
+		if (connector->connector_type == DRM_MODE_CONNECTOR_WRITEBACK)
+			continue;
+
 		aconnector = to_amdgpu_dm_connector(connector);
 
 		if (!aconnector->dc_link)
@@ -3518,6 +3538,9 @@ static void register_hpd_handlers(struct amdgpu_device *adev)
 	list_for_each_entry(connector,
 			&dev->mode_config.connector_list, head)	{
 
+		if (connector->connector_type == DRM_MODE_CONNECTOR_WRITEBACK)
+			continue;
+
 		aconnector = to_amdgpu_dm_connector(connector);
 		dc_link = aconnector->dc_link;
 
@@ -5556,10 +5579,13 @@ static void fill_stream_properties_from_drm_display_mode(
 {
 	struct dc_crtc_timing *timing_out = &stream->timing;
 	const struct drm_display_info *info = &connector->display_info;
-	struct amdgpu_dm_connector *aconnector = to_amdgpu_dm_connector(connector);
+	struct amdgpu_dm_connector *aconnector = NULL;
 	struct hdmi_vendor_infoframe hv_frame;
 	struct hdmi_avi_infoframe avi_frame;
 
+	if (connector->connector_type != DRM_MODE_CONNECTOR_WRITEBACK)
+		aconnector = to_amdgpu_dm_connector(connector);
+
 	memset(&hv_frame, 0, sizeof(hv_frame));
 	memset(&avi_frame, 0, sizeof(avi_frame));
 
@@ -6999,6 +7025,9 @@ static int dm_update_mst_vcpi_slots_for_dsc(struct drm_atomic_state *state,
 
 	for_each_new_connector_in_state(state, connector, new_con_state, i) {
 
+		if (connector->connector_type == DRM_MODE_CONNECTOR_WRITEBACK)
+			continue;
+
 		aconnector = to_amdgpu_dm_connector(connector);
 
 		if (!aconnector->mst_output_port)
@@ -8555,6 +8584,9 @@ static void amdgpu_dm_commit_audio(struct drm_device *dev,
 		if (!drm_atomic_crtc_needs_modeset(new_crtc_state))
 			continue;
 
+		if (connector->connector_type == DRM_MODE_CONNECTOR_WRITEBACK)
+			continue;
+
 notify:
 		aconnector = to_amdgpu_dm_connector(connector);
 
@@ -8588,6 +8620,9 @@ static void amdgpu_dm_commit_audio(struct drm_device *dev,
 		if (!status)
 			continue;
 
+		if (connector->connector_type == DRM_MODE_CONNECTOR_WRITEBACK)
+			continue;
+
 		aconnector = to_amdgpu_dm_connector(connector);
 
 		mutex_lock(&adev->dm.audio_lock);
@@ -8811,7 +8846,12 @@ static void amdgpu_dm_atomic_commit_tail(struct drm_atomic_state *state)
 	for_each_oldnew_connector_in_state(state, connector, old_con_state, new_con_state, i) {
 		struct dm_connector_state *dm_new_con_state = to_dm_connector_state(new_con_state);
 		struct amdgpu_crtc *acrtc = to_amdgpu_crtc(dm_new_con_state->base.crtc);
-		struct amdgpu_dm_connector *aconnector = to_amdgpu_dm_connector(connector);
+		struct amdgpu_dm_connector *aconnector;
+
+		if (connector->connector_type == DRM_MODE_CONNECTOR_WRITEBACK)
+			continue;
+
+		aconnector = to_amdgpu_dm_connector(connector);
 
 		if (!adev->dm.hdcp_workqueue)
 			continue;
@@ -9205,10 +9245,15 @@ static int dm_force_atomic_commit(struct drm_connector *connector)
 void dm_restore_drm_connector_state(struct drm_device *dev,
 				    struct drm_connector *connector)
 {
-	struct amdgpu_dm_connector *aconnector = to_amdgpu_dm_connector(connector);
+	struct amdgpu_dm_connector *aconnector;
 	struct amdgpu_crtc *disconnected_acrtc;
 	struct dm_crtc_state *acrtc_state;
 
+	if (connector->connector_type == DRM_MODE_CONNECTOR_WRITEBACK)
+		return;
+
+	aconnector = to_amdgpu_dm_connector(connector);
+
 	if (!aconnector->dc_sink || !connector->state || !connector->encoder)
 		return;
 
@@ -9285,12 +9330,16 @@ static void get_freesync_config_for_crtc(
 	struct dm_connector_state *new_con_state)
 {
 	struct mod_freesync_config config = {0};
-	struct amdgpu_dm_connector *aconnector =
-			to_amdgpu_dm_connector(new_con_state->base.connector);
+	struct amdgpu_dm_connector *aconnector;
 	struct drm_display_mode *mode = &new_crtc_state->base.mode;
 	int vrefresh = drm_mode_vrefresh(mode);
 	bool fs_vid_mode = false;
 
+	if (new_con_state->base.connector->connector_type == DRM_MODE_CONNECTOR_WRITEBACK)
+		return;
+
+	aconnector = to_amdgpu_dm_connector(new_con_state->base.connector);
+
 	new_crtc_state->vrr_supported = new_con_state->freesync_capable &&
 					vrefresh >= aconnector->min_vfreq &&
 					vrefresh <= aconnector->max_vfreq;
@@ -10084,6 +10133,9 @@ static int add_affected_mst_dsc_crtcs(struct drm_atomic_state *state, struct drm
 		if (conn_state->crtc != crtc)
 			continue;
 
+		if (connector->connector_type == DRM_MODE_CONNECTOR_WRITEBACK)
+			continue;
+
 		aconnector = to_amdgpu_dm_connector(connector);
 		if (!aconnector->mst_output_port || !aconnector->mst_root)
 			aconnector = NULL;

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

@@ -326,6 +326,9 @@ int amdgpu_dm_crtc_set_crc_source(struct drm_crtc *crtc, const char *src_name)
 			if (!connector->state || connector->state->crtc != crtc)
 				continue;
 
+			if (connector->connector_type == DRM_MODE_CONNECTOR_WRITEBACK)
+				continue;
+
 			aconn = to_amdgpu_dm_connector(connector);
 			break;
 		}

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

@@ -894,10 +894,15 @@ void amdgpu_dm_hpd_init(struct amdgpu_device *adev)
 
 	drm_connector_list_iter_begin(dev, &iter);
 	drm_for_each_connector_iter(connector, &iter) {
-		struct amdgpu_dm_connector *amdgpu_dm_connector =
-				to_amdgpu_dm_connector(connector);
+		struct amdgpu_dm_connector *amdgpu_dm_connector;
+		const struct dc_link *dc_link;
 
-		const struct dc_link *dc_link = amdgpu_dm_connector->dc_link;
+		if (connector->connector_type == DRM_MODE_CONNECTOR_WRITEBACK)
+			continue;
+
+		amdgpu_dm_connector = to_amdgpu_dm_connector(connector);
+
+		dc_link = amdgpu_dm_connector->dc_link;
 
 		if (dc_link->irq_source_hpd != DC_IRQ_SOURCE_INVALID) {
 			dc_interrupt_set(adev->dm.dc,
@@ -930,9 +935,14 @@ void amdgpu_dm_hpd_fini(struct amdgpu_device *adev)
 
 	drm_connector_list_iter_begin(dev, &iter);
 	drm_for_each_connector_iter(connector, &iter) {
-		struct amdgpu_dm_connector *amdgpu_dm_connector =
-				to_amdgpu_dm_connector(connector);
-		const struct dc_link *dc_link = amdgpu_dm_connector->dc_link;
+		struct amdgpu_dm_connector *amdgpu_dm_connector;
+		const struct dc_link *dc_link;
+
+		if (connector->connector_type == DRM_MODE_CONNECTOR_WRITEBACK)
+			continue;
+
+		amdgpu_dm_connector = to_amdgpu_dm_connector(connector);
+		dc_link = amdgpu_dm_connector->dc_link;
 
 		if (dc_link->irq_source_hpd != DC_IRQ_SOURCE_INVALID) {
 			dc_interrupt_set(adev->dm.dc,