On 2024-01-15 11:05, Andri Yngvason wrote:
> From: Werner Sembach <w...@tuxedocomputers.com>
> 
> Remove unnecessary SIGNAL_TYPE_HDMI_TYPE_A check that was performed in the
> drm_mode_is_420_only() case, but not in the drm_mode_is_420_also() &&
> force_yuv420_output case.
> 
> Without further knowledge if YCbCr 4:2:0 is supported outside of HDMI,
> there is no reason to use RGB when the display
> reports drm_mode_is_420_only() even on a non HDMI connection.
> 
> This patch also moves both checks in the same if-case. This  eliminates an
> extra else-if-case.
> 
> Signed-off-by: Werner Sembach <w...@tuxedocomputers.com>
> Signed-off-by: Andri Yngvason <an...@yngvason.is>
> Tested-by: Andri Yngvason <an...@yngvason.is>
> ---
>  drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 6 +-----
>  1 file changed, 1 insertion(+), 5 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 f6575d7dee971..cc4d1f7f97b98 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> @@ -5575,11 +5575,7 @@ static void 
> fill_stream_properties_from_drm_display_mode(
>       timing_out->v_border_bottom = 0;
>       /* TODO: un-hardcode */
>       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
> -                     && aconnector->force_yuv420_output)
> +                     || (drm_mode_is_420_also(info, mode_in) && 
> aconnector->force_yuv420_output))

We need to keep the && aconnector NULL check here, otherwise
writeback connectors will blow up.

Harry

>               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)

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