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SubjectRe: [PATCH v2 1/4] drm/amd/display: Remove unnecessary SIGNAL_TYPE_HDMI_TYPE_A check
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On 2024-01-15 11:05, Andri Yngvason wrote:
> From: Werner Sembach <wse@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 <wse@tuxedocomputers.com>
> Signed-off-by: Andri Yngvason <andri@yngvason.is>
> Tested-by: Andri Yngvason <andri@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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