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drm/amd/display: Add debugfs entry to force YUV420 output

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[Why]
Even if YUV420 is available for video mode, YUV444 is still
automatically selected. This poses a problem for compliance tests.

[How]
Add a per-connector debugfs entry "force_yuv420_output" to force
selection of YUV420 mode.

Signed-off-by: Stylon Wang <stylon.wang@amd.com>
Reviewed-by: Nicholas Kazlauskas <Nicholas.Kazlauskas@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Stylon Wang
2019-08-20 14:48:37 -04:00
committed by Alex Deucher
parent 7470123829
commit d4252eee1f
3 changed files with 36 additions and 1 deletions
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5
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
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@@ -3312,7 +3312,7 @@ 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);
memset(timing_out, 0, sizeof(struct dc_crtc_timing));
timing_out->h_border_left = 0;
@@ -3323,6 +3323,9 @@ static void fill_stream_properties_from_drm_display_mode(
if (drm_mode_is_420_only(info, mode_in)
&& 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->force_yuv420_output)
timing_out->pixel_encoding = PIXEL_ENCODING_YCBCR420;
else if ((connector->display_info.color_formats & DRM_COLOR_FORMAT_YCRCB444)
&& stream->signal == SIGNAL_TYPE_HDMI_TYPE_A)
timing_out->pixel_encoding = PIXEL_ENCODING_YCBCR444;