Re: [PATCH 06/18] drm/amd/display: Use drm_connector in create_stream_for_sink

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Reviewed-by: Alex Hung <alex.hung@xxxxxxx>

On 2023-08-16 15:26, Alex Hung wrote:
From: Harry Wentland <harry.wentland@xxxxxxx>

[WHAT]
We need to use this function for both amdgpu_dm_connectors
and drm_writeback_connectors. Modify it to operate on
a drm_connector as a common base.

Signed-off-by: Harry Wentland <harry.wentland@xxxxxxx>
Signed-off-by: Alex Hung <alex.hung@xxxxxxx>
---
  .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 65 +++++++++++--------
  1 file changed, 37 insertions(+), 28 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 7bd3ec84ff2e..a7d2a3f35f74 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -5455,6 +5455,7 @@ static void fill_stream_properties_from_drm_display_mode(
  			&& stream->signal == SIGNAL_TYPE_HDMI_TYPE_A)
  		timing_out->pixel_encoding = PIXEL_ENCODING_YCBCR420;
  	else if (drm_mode_is_420_also(info, mode_in)
+			&& aconnector
  			&& aconnector->force_yuv420_output)
  		timing_out->pixel_encoding = PIXEL_ENCODING_YCBCR420;
  	else if ((connector->display_info.color_formats & DRM_COLOR_FORMAT_YCBCR444)
@@ -5490,7 +5491,7 @@ static void fill_stream_properties_from_drm_display_mode(
  		timing_out->hdmi_vic = hv_frame.vic;
  	}
- if (is_freesync_video_mode(mode_in, aconnector)) {
+	if (aconnector && is_freesync_video_mode(mode_in, aconnector)) {
  		timing_out->h_addressable = mode_in->hdisplay;
  		timing_out->h_total = mode_in->htotal;
  		timing_out->h_sync_width = mode_in->hsync_end - mode_in->hsync_start;
@@ -5966,14 +5967,14 @@ static void apply_dsc_policy_for_stream(struct amdgpu_dm_connector *aconnector,
  }
static struct dc_stream_state *
-create_stream_for_sink(struct amdgpu_dm_connector *aconnector,
+create_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,
  		       int requested_bpc)
  {
+	struct amdgpu_dm_connector *aconnector = NULL;
  	struct drm_display_mode *preferred_mode = NULL;
-	struct drm_connector *drm_connector;
  	const struct drm_connector_state *con_state = &dm_state->base;
  	struct dc_stream_state *stream = NULL;
  	struct drm_display_mode mode;
@@ -5992,20 +5993,22 @@ create_stream_for_sink(struct amdgpu_dm_connector *aconnector,
  	drm_mode_init(&mode, drm_mode);
  	memset(&saved_mode, 0, sizeof(saved_mode));
- if (aconnector == NULL) {
-		DRM_ERROR("aconnector is NULL!\n");
+	if (connector == NULL) {
+		DRM_ERROR("connector is NULL!\n");
  		return stream;
  	}
- drm_connector = &aconnector->base;
-
-	if (!aconnector->dc_sink) {
-		sink = create_fake_sink(aconnector);
-		if (!sink)
-			return stream;
-	} else {
-		sink = aconnector->dc_sink;
-		dc_sink_retain(sink);
+	if (connector->connector_type != DRM_MODE_CONNECTOR_WRITEBACK) {
+		aconnector = NULL;
+		aconnector = to_amdgpu_dm_connector(connector);
+		if (!aconnector->dc_sink) {
+			sink = create_fake_sink(aconnector);
+			if (!sink)
+				return stream;
+		} else {
+			sink = aconnector->dc_sink;
+			dc_sink_retain(sink);
+		}
  	}
stream = dc_create_stream_for_sink(sink);
@@ -6015,12 +6018,13 @@ create_stream_for_sink(struct amdgpu_dm_connector *aconnector,
  		goto finish;
  	}
+ /* We leave this NULL for writeback connectors */
  	stream->dm_stream_context = aconnector;
stream->timing.flags.LTE_340MCSC_SCRAMBLE =
-		drm_connector->display_info.hdmi.scdc.scrambling.low_rates;
+		connector->display_info.hdmi.scdc.scrambling.low_rates;
- list_for_each_entry(preferred_mode, &aconnector->base.modes, head) {
+	list_for_each_entry(preferred_mode, &connector->modes, head) {
  		/* Search for preferred mode */
  		if (preferred_mode->type & DRM_MODE_TYPE_PREFERRED) {
  			native_mode_found = true;
@@ -6029,7 +6033,7 @@ create_stream_for_sink(struct amdgpu_dm_connector *aconnector,
  	}
  	if (!native_mode_found)
  		preferred_mode = list_first_entry_or_null(
-				&aconnector->base.modes,
+				&connector->modes,
  				struct drm_display_mode,
  				head);
@@ -6043,7 +6047,7 @@ create_stream_for_sink(struct amdgpu_dm_connector *aconnector,
  		 * and the modelist may not be filled in time.
  		 */
  		DRM_DEBUG_DRIVER("No preferred mode found\n");
-	} else {
+	} else if (aconnector) {
  		recalculate_timing = is_freesync_video_mode(&mode, aconnector);
  		if (recalculate_timing) {
  			freesync_mode = get_highest_refresh_rate_mode(aconnector, false);
@@ -6068,13 +6072,17 @@ create_stream_for_sink(struct amdgpu_dm_connector *aconnector,
  	 */
  	if (!scale || mode_refresh != preferred_refresh)
  		fill_stream_properties_from_drm_display_mode(
-			stream, &mode, &aconnector->base, con_state, NULL,
+			stream, &mode, connector, con_state, NULL,
  			requested_bpc);
  	else
  		fill_stream_properties_from_drm_display_mode(
-			stream, &mode, &aconnector->base, con_state, old_stream,
+			stream, &mode, connector, con_state, old_stream,
  			requested_bpc);
+ /* The rest isn't needed for writeback connectors */
+	if (!aconnector)
+		goto finish;
+
  	if (aconnector->timing_changed) {
  		DC_LOG_DEBUG("%s: overriding timing for automated test, bpc %d, changing to %d\n",
  				__func__,
@@ -6092,7 +6100,7 @@ create_stream_for_sink(struct amdgpu_dm_connector *aconnector,
fill_audio_info(
  		&stream->audio_info,
-		drm_connector,
+		connector,
  		sink);
update_stream_signal(stream, sink);
@@ -6551,7 +6559,7 @@ create_validate_stream_for_sink(struct amdgpu_dm_connector *aconnector,
  	enum dc_status dc_result = DC_OK;
do {
-		stream = create_stream_for_sink(aconnector, drm_mode,
+		stream = create_stream_for_sink(connector, drm_mode,
  						dm_state, old_stream,
  						requested_bpc);
  		if (stream == NULL) {
@@ -9274,15 +9282,16 @@ static int dm_update_crtc_state(struct amdgpu_display_manager *dm,
  	dm_new_crtc_state = to_dm_crtc_state(new_crtc_state);
  	acrtc = to_amdgpu_crtc(crtc);
  	connector = amdgpu_dm_find_first_crtc_matching_connector(state, crtc);
-	aconnector = to_amdgpu_dm_connector(connector);
+	if (connector && connector->connector_type != DRM_MODE_CONNECTOR_WRITEBACK)
+		aconnector = to_amdgpu_dm_connector(connector);
/* TODO This hack should go away */
-	if (aconnector && enable) {
+	if (connector && enable) {
  		/* Make sure fake sink is created in plug-in scenario */
  		drm_new_conn_state = drm_atomic_get_new_connector_state(state,
-							    &aconnector->base);
+									connector);
  		drm_old_conn_state = drm_atomic_get_old_connector_state(state,
-							    &aconnector->base);
+									connector);
if (IS_ERR(drm_new_conn_state)) {
  			ret = PTR_ERR_OR_ZERO(drm_new_conn_state);
@@ -9429,7 +9438,7 @@ static int dm_update_crtc_state(struct amdgpu_display_manager *dm,
  		 * added MST connectors not found in existing crtc_state in the chained mode
  		 * TODO: need to dig out the root cause of that
  		 */
-		if (!aconnector)
+		if (!connector)
  			goto skip_modeset;
if (modereset_required(new_crtc_state))
@@ -9472,7 +9481,7 @@ static int dm_update_crtc_state(struct amdgpu_display_manager *dm,
  	 * We want to do dc stream updates that do not require a
  	 * full modeset below.
  	 */
-	if (!(enable && aconnector && new_crtc_state->active))
+	if (!(enable && connector && new_crtc_state->active))
  		return 0;
  	/*
  	 * Given above conditions, the dc state cannot be NULL because:



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