Re: [PATCH 1/4] drm: Add P010, P012, P016 format definitions and fourcc

[Maarten Lankhorst <maarten.lankhorst@linux.intel.com>]

Op 29-05-18 om 15:28 schreef Juha-Pekka Heikkila:
> Add P010 definition, semi-planar yuv format where each component
> is 16 bits 10 msb containing color value. First come Y plane [10:6]
> followed by 2x2 subsampled Cr:Cb plane [10:6:10:6]
>
> Add P012 definition, semi-planar yuv format where each component
> is 16 bits 12 msb containing color value. First come Y plane [12:4]
> followed by 2x2 subsampled Cr:Cb plane [12:4:12:4]
>
> Add P016 definition, semi-planar yuv format where each component
> is 16 bits. First come Y plane followed by 2x2 subsampled Cr:Cb
> plane [16:16]
>
> Signed-off-by: Juha-Pekka Heikkila <juhapekka.heikkila@gmail.com>
> ---
>  drivers/gpu/drm/drm_fourcc.c  | 3 +++
>  include/uapi/drm/drm_fourcc.h | 4 ++++
>  2 files changed, 7 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_fourcc.c b/drivers/gpu/drm/drm_fourcc.c
> index 5ca6395..5bb2641 100644
> --- a/drivers/gpu/drm/drm_fourcc.c
> +++ b/drivers/gpu/drm/drm_fourcc.c
> @@ -173,6 +173,9 @@ const struct drm_format_info *__drm_format_info(u32 format)
>  		{ .format = DRM_FORMAT_UYVY,		.depth = 0,  .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 2, .vsub = 1 },
>  		{ .format = DRM_FORMAT_VYUY,		.depth = 0,  .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 2, .vsub = 1 },
>  		{ .format = DRM_FORMAT_AYUV,		.depth = 0,  .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
> +		{ .format = DRM_FORMAT_P010,		.depth = 0,  .num_planes = 2, .cpp = { 2, 4, 0 }, .hsub = 2, .vsub = 2 },
> +		{ .format = DRM_FORMAT_P012,		.depth = 0,  .num_planes = 2, .cpp = { 2, 4, 0 }, .hsub = 2, .vsub = 2 },
> +		{ .format = DRM_FORMAT_P016,		.depth = 0,  .num_planes = 2, .cpp = { 2, 4, 0 }, .hsub = 2, .vsub = 2 },
>  	};
>  
>  	unsigned int i;
> diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h
> index e04613d..0b259ad 100644
> --- a/include/uapi/drm/drm_fourcc.h
> +++ b/include/uapi/drm/drm_fourcc.h
> @@ -141,6 +141,10 @@ extern "C" {
>  #define DRM_FORMAT_NV24		fourcc_code('N', 'V', '2', '4') /* non-subsampled Cr:Cb plane */
>  #define DRM_FORMAT_NV42		fourcc_code('N', 'V', '4', '2') /* non-subsampled Cb:Cr plane */
>  
> +#define DRM_FORMAT_P010		fourcc_code('P', '0', '1', '0') /* 2x2 subsampled Cr:Cb plane, 10 bit per channel */
> +#define DRM_FORMAT_P012		fourcc_code('P', '0', '1', '2') /* 2x2 subsampled Cr:Cb plane, 12 bit per channel */
> +#define DRM_FORMAT_P016		fourcc_code('P', '0', '1', '6') /* 2x2 subsampled Cr:Cb plane, 16 bit per channel */
> +
>  /*
>   * 3 plane YCbCr
>   * index 0: Y plane, [7:0] Y

Hey,

The DRM_FORMAT specifications are a bit unclear. It should be made clear that P010 = P016, with the lower 6 bits zerod.

~Maarten

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