drm/amd/display: adding ycbcr420 pixel encoding for hdmi

[why]
HDMI EDID's VSDB contains spectial timings for specifically
YCbCr 4:2:0 colour space. In those cases we need to verify
if the mode provided is one of the special ones has to use
YCbCr 4:2:0 pixel encoding for display info.
[how]
Verify if the mode is using specific ycbcr420 colour space with
the help of DRM helper function and assign the mode to use
ycbcr420 pixel encoding.

Signed-off-by: Mikita Lipski <mikita.lipski@amd.com>
Tested-by: Mike Lothian <mike@fireburn.co.uk>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 5 insertions, 2 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 74683071fa81..1386c857546d 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -2184,6 +2184,7 @@ fill_stream_properties_from_drm_display_mode(struct dc_stream_state *stream,
                                              const struct drm_connector *connector)
 {
         struct dc_crtc_timing *timing_out = &stream->timing;
+        const struct drm_display_info *info = &connector->display_info;
 
         memset(timing_out, 0, sizeof(struct dc_crtc_timing));
 
@@ -2192,8 +2193,10 @@ fill_stream_properties_from_drm_display_mode(struct dc_stream_state *stream,
         timing_out->v_border_top = 0;
         timing_out->v_border_bottom = 0;
         /* TODO: un-hardcode */
-
-        if ((connector->display_info.color_formats & DRM_COLOR_FORMAT_YCRCB444)
+        if (drm_mode_is_420_only(info, mode_in)
+                        && stream->sink->sink_signal == SIGNAL_TYPE_HDMI_TYPE_A)
+                timing_out->pixel_encoding = PIXEL_ENCODING_YCBCR420;
+        else if ((connector->display_info.color_formats & DRM_COLOR_FORMAT_YCRCB444)
                         && stream->sink->sink_signal == SIGNAL_TYPE_HDMI_TYPE_A)
                 timing_out->pixel_encoding = PIXEL_ENCODING_YCBCR444;
         else