[PATCH 6/7] drm/amd/display: Add handling for new "preferred color format" property

[Andri Yngvason]

From: Werner Sembach <wse at tuxedocomputers.com>

This commit implements the "preferred color format" drm property for the
AMD GPU driver.

Signed-off-by: Werner Sembach <wse at tuxedocomputers.com>
Signed-off-by: Andri Yngvason <andri at yngvason.is>
Tested-by: Andri Yngvason <andri at yngvason.is>
---
 .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 30 +++++++++++++++----
 .../display/amdgpu_dm/amdgpu_dm_mst_types.c   |  4 +++
 2 files changed, 28 insertions(+), 6 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 b44d06c3b1706..262d420877c91 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -5522,15 +5522,32 @@ static void fill_stream_properties_from_drm_display_mode(
 	timing_out->h_border_right = 0;
 	timing_out->v_border_top = 0;
 	timing_out->v_border_bottom = 0;
-	/* TODO: un-hardcode */
-	if (drm_mode_is_420_only(info, mode_in)
-			|| (drm_mode_is_420_also(info, mode_in) && aconnector->force_yuv420_output))
+
+	if (connector_state
+			&& (connector_state->preferred_color_format == DRM_COLOR_FORMAT_YCBCR420
+			|| aconnector->force_yuv420_output) && drm_mode_is_420(info, mode_in))
 		timing_out->pixel_encoding = PIXEL_ENCODING_YCBCR420;
-	else if ((connector->display_info.color_formats & DRM_COLOR_FORMAT_YCBCR444)
-			&& stream->signal == SIGNAL_TYPE_HDMI_TYPE_A)
+	else if (connector_state
+			&& connector_state->preferred_color_format == DRM_COLOR_FORMAT_YCBCR444
+			&& connector->display_info.color_formats & DRM_COLOR_FORMAT_YCBCR444)
 		timing_out->pixel_encoding = PIXEL_ENCODING_YCBCR444;
-	else
+	else if (connector_state
+			&& connector_state->preferred_color_format == DRM_COLOR_FORMAT_RGB444
+			&& !drm_mode_is_420_only(info, mode_in))
 		timing_out->pixel_encoding = PIXEL_ENCODING_RGB;
+	else
+		/*
+		 * connector_state->preferred_color_format not possible
+		 * || connector_state->preferred_color_format == 0 (auto)
+		 * || connector_state->preferred_color_format == DRM_COLOR_FORMAT_YCBCR422
+		 */
+		if (drm_mode_is_420_only(info, mode_in))
+			timing_out->pixel_encoding = PIXEL_ENCODING_YCBCR420;
+		else if ((connector->display_info.color_formats & DRM_COLOR_FORMAT_YCBCR444)
+				&& stream->signal == SIGNAL_TYPE_HDMI_TYPE_A)
+			timing_out->pixel_encoding = PIXEL_ENCODING_YCBCR444;
+		else
+			timing_out->pixel_encoding = PIXEL_ENCODING_RGB;
 
 	timing_out->timing_3d_format = TIMING_3D_FORMAT_NONE;
 	timing_out->display_color_depth = convert_color_depth_from_display_info(
@@ -7456,6 +7473,7 @@ void amdgpu_dm_connector_init_helper(struct amdgpu_display_manager *dm,
 
 	if (!aconnector->mst_root) {
 		drm_connector_attach_max_bpc_property(&aconnector->base, 8, 16);
+		drm_connector_attach_preferred_color_format_property(&aconnector->base);
 		drm_connector_attach_active_color_format_property(&aconnector->base);
 	}
 
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
index a4d1b3ea8f81c..dc8cea0ac2c11 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
@@ -600,6 +600,10 @@ dm_dp_add_mst_connector(struct drm_dp_mst_topology_mgr *mgr,
 	if (connector->max_bpc_property)
 		drm_connector_attach_max_bpc_property(connector, 8, 16);
 
+	connector->preferred_color_format_property = master->base.preferred_color_format_property;
+	if (connector->preferred_color_format_property)
+		drm_connector_attach_preferred_color_format_property(&aconnector->base);
+
 	connector->active_color_format_property = master->base.active_color_format_property;
 	if (connector->active_color_format_property)
 		drm_connector_attach_active_color_format_property(&aconnector->base);
-- 
2.43.0