Re: [PATCH 5/7] drm: Add Y2xx and Y4xx (xx:10/12/16) format definitions and fourcc

Maarten Lankhorst
2019-02-08T14:57:47Z

Op 08-02-2019 om 14:47 schreef swati2.sharma@intel.com:
> From: Swati Sharma <swati2.sharma@intel.com>
>
> The following pixel formats are packed format that follows 4:2:2
> chroma sampling. For memory represenation each component is
> allocated 16 bits each. Thus each pixel occupies 32bit.
>
> Y210: For each component, valid data occupies MSB 10 bits.
> LSB 6 bits are filled with zeroes.
> Y212: For each component, valid data occupies MSB 12 bits.
> LSB 4 bits are filled with zeroes.
> Y216: For each component valid data occupies 16 bits,
> doesn't require any padding bits.
>
> First 16 bits stores the Y value and the next 16 bits stores one
> of the chroma samples alternatively. The first luma sample will
> be accompanied by first U sample and second luma sample is
> accompanied by the first V sample.
>
> The following pixel formats are packed format that follows 4:4:4
> chroma sampling. Channels are arranged in the order UYVA in
> increasing memory order.
>
> Y410: Each color component occupies 10 bits and X component
> takes 2 bits, thus each pixel occupies 32 bits.
> Y412: Each color component is 16 bits where valid data
> occupies MSB 12 bits. LSB 4 bits are filled with zeroes.
> Thus, each pixel occupies 64 bits.
> Y416: Each color component occupies 16 bits for valid data,
> doesn't require any padding bits. Thus, each pixel
> occupies 64 bits.
>
> Signed-off-by: Swati Sharma <swati2.sharma@intel.com>
> ---
> drivers/gpu/drm/drm_fourcc.c | 6 ++++++
> include/uapi/drm/drm_fourcc.h | 18 +++++++++++++++++-
> 2 files changed, 23 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/drm_fourcc.c b/drivers/gpu/drm/drm_fourcc.c
> index d45a3a4..16cbeea 100644
> --- a/drivers/gpu/drm/drm_fourcc.c
> +++ b/drivers/gpu/drm/drm_fourcc.c
> @@ -229,6 +229,12 @@ const struct drm_format_info *__drm_format_info(u32 format)
> { .format = DRM_FORMAT_P010, .depth = 0, .num_planes = 2, .cpp = { 2, 4, 0 }, .hsub = 2, .vsub = 2, .is_yuv = true },
> { .format = DRM_FORMAT_P012, .depth = 0, .num_planes = 2, .cpp = { 2, 4, 0 }, .hsub = 2, .vsub = 2, .is_yuv = true },
> { .format = DRM_FORMAT_P016, .depth = 0, .num_planes = 2, .cpp = { 2, 4, 0 }, .hsub = 2, .vsub = 2, .is_yuv = true },
> + { .format = DRM_FORMAT_Y210, .depth = 0, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 2, .vsub = 1, .is_yuv = true },
> + { .format = DRM_FORMAT_Y212, .depth = 0, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 2, .vsub = 1, .is_yuv = true },
> + { .format = DRM_FORMAT_Y216, .depth = 0, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 2, .vsub = 1, .is_yuv = true },
> + { .format = DRM_FORMAT_Y410, .depth = 0, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .is_yuv = true },
> + { .format = DRM_FORMAT_Y412, .depth = 0, .num_planes = 1, .cpp = { 8, 0, 0 }, .hsub = 1, .vsub = 1, .is_yuv = true },
> + { .format = DRM_FORMAT_Y416, .depth = 0, .num_planes = 1, .cpp = { 8, 0, 0 }, .hsub = 1, .vsub = 1, .is_yuv = true },
> { .format = DRM_FORMAT_Y0L0, .depth = 0, .num_planes = 1,
> .char_per_block = { 8, 0, 0 }, .block_w = { 2, 0, 0 }, .block_h = { 2, 0, 0 },
> .hsub = 2, .vsub = 2, .has_alpha = true, .is_yuv = true },
> diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h
> index 073bbea..5535669 100644
> --- a/include/uapi/drm/drm_fourcc.h
> +++ b/include/uapi/drm/drm_fourcc.h
> @@ -151,7 +151,23 @@
> #define DRM_FORMAT_VYUY fourcc_code('V', 'Y', 'U', 'Y') /* [31:0] Y1:Cb0:Y0:Cr0 8:8:8:8 little endian */
>
> #define DRM_FORMAT_AYUV fourcc_code('A', 'Y', 'U', 'V') /* [31:0] A:Y:Cb:Cr 8:8:8:8 little endian */
> -#define DRM_FORMAT_XYUV8888 fourcc_code('X', 'Y', 'U', 'V') /* [31:0] X:Y:Cb:Cr 8:8:8:8 little endian */
> +#define DRM_FORMAT_XYUV8888 fourcc_code('X', 'Y', 'U', 'V') /* [31:0] X:Y:Cb:Cr 8:8:8:8 little endian */
> +
> +/*
> + * packed Y2xx indicate for each component, xx valid data occupy msb
> + * 16-xx padding occupy lsb
> + */
> +#define DRM_FORMAT_Y210 fourcc_code('Y', '2', '1', '0') /* [63:0] Y0:x:Cb0:x:Y1:x:Cr1:x 10:6:10:6:10:6:10:6 little endian per 2 Y pixels */
> +#define DRM_FORMAT_Y212 fourcc_code('Y', '2', '1', '2') /* [63:0] Y0:x:Cb0:x:Y1:x:Cr1:x 12:4:12:4:12:4:12:4 little endian per 2 Y pixels */
> +#define DRM_FORMAT_Y216 fourcc_code('Y', '2', '1', '6') /* [63:0] Y0:Cb0:Y1:Cr1 16:16:16:16 little endian per 2 Y pixels */
> +
> +/*
> + * packed Y4xx indicate for each component, xx valid data occupy msb
> + * 16-xx padding occupy lsb except Y410
> + */
> +#define DRM_FORMAT_Y410 fourcc_code('Y', '4', '1', '0') /* [31:0] X:V:Y:U 2:10:10:10 little endian */
> +#define DRM_FORMAT_Y412 fourcc_code('Y', '4', '1', '2') /* [63:0] X:x:V:x:Y:x:U:x 12:4:12:4:12:4:12:4 little endian */
> +#define DRM_FORMAT_Y416 fourcc_code('Y', '4', '1', '6') /* [63:0] X:V:Y:U 16:16:16:16 little endian */
>
> /*
> * packed YCbCr420 2x2 tiled formats

I thought Y41x explicitly mentioned alpha?

Probably better to name it XYUV_2101010/XYUV_12121212/XYUV_16161616

Other than that series looks good, so for all patches except this one.

Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>

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