Re: [PATCH v5 03/11] drm/fourcc: Add DRM_FORMAT_Y8

["Sagar, Vishal" <vishal.sagar@amd.com>]

Hi Tomi,

Thanks for the patch.

On 4/25/2025 1:01 PM, Tomi Valkeinen wrote:
> Add greyscale Y8 format.
> 
> Acked-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
> ---
>   drivers/gpu/drm/drm_fourcc.c  |  1 +
>   include/uapi/drm/drm_fourcc.h | 10 ++++++++++
>   2 files changed, 11 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_fourcc.c b/drivers/gpu/drm/drm_fourcc.c
> index e101d1b99aeb..355aaf7b5e9e 100644
> --- a/drivers/gpu/drm/drm_fourcc.c
> +++ b/drivers/gpu/drm/drm_fourcc.c
> @@ -267,6 +267,7 @@ const struct drm_format_info *__drm_format_info(u32 format)
>   		{ .format = DRM_FORMAT_YVU422,		.depth = 0,  .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 2, .vsub = 1, .is_yuv = true },
>   		{ .format = DRM_FORMAT_YUV444,		.depth = 0,  .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 1, .vsub = 1, .is_yuv = true },
>   		{ .format = DRM_FORMAT_YVU444,		.depth = 0,  .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 1, .vsub = 1, .is_yuv = true },
> +		{ .format = DRM_FORMAT_Y8,		.depth = 8,  .num_planes = 1, .cpp = { 1, 0, 0 }, .hsub = 1, .vsub = 1, .is_yuv = true },
>   		{ .format = DRM_FORMAT_NV12,		.depth = 0,  .num_planes = 2, .cpp = { 1, 2, 0 }, .hsub = 2, .vsub = 2, .is_yuv = true },
>   		{ .format = DRM_FORMAT_NV21,		.depth = 0,  .num_planes = 2, .cpp = { 1, 2, 0 }, .hsub = 2, .vsub = 2, .is_yuv = true },
>   		{ .format = DRM_FORMAT_NV16,		.depth = 0,  .num_planes = 2, .cpp = { 1, 2, 0 }, .hsub = 2, .vsub = 1, .is_yuv = true },
> diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h
> index 1247b814bd66..5af64a683dd7 100644
> --- a/include/uapi/drm/drm_fourcc.h
> +++ b/include/uapi/drm/drm_fourcc.h
> @@ -405,6 +405,16 @@ extern "C" {
>   #define DRM_FORMAT_YUV444	fourcc_code('Y', 'U', '2', '4') /* non-subsampled Cb (1) and Cr (2) planes */
>   #define DRM_FORMAT_YVU444	fourcc_code('Y', 'V', '2', '4') /* non-subsampled Cr (1) and Cb (2) planes */
>   
> +/*
> + * Y-only (greyscale) formats
> + *
> + * The Y-only formats are handled similarly to the YCbCr formats in the display
> + * pipeline, with the Cb and Cr implicitly neutral (0.0 in nominal values). This
> + * also means that COLOR_RANGE property applies to the Y-only formats.
> + *
> + */
> +
> +#define DRM_FORMAT_Y8		fourcc_code('G', 'R', 'E', 'Y')  /* 8-bit Y-only */
>   
>   /*
>    * Format Modifiers:
> 

Feel free to add -

Reviewed-by: Vishal Sagar <vishal.sagar@amd.com>

Regards
Vishal Sagar