Re: [PATCH 1/2] drm: drm_fourcc: add NV20 YUV format【请注意，邮件由linux-rockchip-bounces+sandy.huang=rock-chips.com at lists.infradead.org代发】

[Huang Jiachai]

Hi Jonas Karlman,

     Is there an another yuv 10bit format with 4:4:4 sub-simpling but 
has no padding?

  Maybe we can call it DRM_FORMAT_NV30:

{ .format = DRM_FORMAT_NV30,		.depth = 0,
   .num_planes = 2, .char_per_block = { 5, 5, 0 },
   .block_w = { 4, 2, 0 }, .block_h = { 1, 1, 0 }, .hsub = 1,
   .vsub = 1, .is_yuv = true },

this format can supported by rockchip rk3288/rk3399... platform, can you 
add this format at this series patches?

在 2020/6/8 4:25, Jonas Karlman 写道:
> DRM_FORMAT_NV20 is a 2 plane format suitable for linear memory layout.
> The format is similar to P210 with 4:2:2 sub-sampling but has no padding
> between components. Instead, luminance and chrominance samples are grouped
> into 4s so that each group is packed into an integer number of bytes:
>
> YYYY = UVUV = 4 * 10 bits = 40 bits = 5 bytes
>
> The '20' suffix refers to the optimum effective bits per pixel which is
> achieved when the total number of luminance samples is a multiple of 4.
>
> Signed-off-by: Jonas Karlman <jonas at kwiboo.se>
> ---
>   drivers/gpu/drm/drm_fourcc.c  | 4 ++++
>   include/uapi/drm/drm_fourcc.h | 1 +
>   2 files changed, 5 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_fourcc.c b/drivers/gpu/drm/drm_fourcc.c
> index 722c7ebe4e88..2a9c8ae719ed 100644
> --- a/drivers/gpu/drm/drm_fourcc.c
> +++ b/drivers/gpu/drm/drm_fourcc.c
> @@ -278,6 +278,10 @@ const struct drm_format_info *__drm_format_info(u32 format)
>   		  .num_planes = 2, .char_per_block = { 5, 5, 0 },
>   		  .block_w = { 4, 2, 0 }, .block_h = { 1, 1, 0 }, .hsub = 2,
>   		  .vsub = 2, .is_yuv = true },
> +		{ .format = DRM_FORMAT_NV20,		.depth = 0,
> +		  .num_planes = 2, .char_per_block = { 5, 5, 0 },
> +		  .block_w = { 4, 2, 0 }, .block_h = { 1, 1, 0 }, .hsub = 2,
> +		  .vsub = 1, .is_yuv = true },
>   		{ .format = DRM_FORMAT_Q410,		.depth = 0,
>   		  .num_planes = 3, .char_per_block = { 2, 2, 2 },
>   		  .block_w = { 1, 1, 1 }, .block_h = { 1, 1, 1 }, .hsub = 0,
> diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h
> index b5bf1c0e630e..244d32433a67 100644
> --- a/include/uapi/drm/drm_fourcc.h
> +++ b/include/uapi/drm/drm_fourcc.h
> @@ -242,6 +242,7 @@ extern "C" {
>    * index 1 = Cr:Cb plane, [39:0] Cr1:Cb1:Cr0:Cb0 little endian
>    */
>   #define DRM_FORMAT_NV15		fourcc_code('N', 'V', '1', '5') /* 2x2 subsampled Cr:Cb plane */
> +#define DRM_FORMAT_NV20		fourcc_code('N', 'V', '2', '0') /* 2x1 subsampled Cr:Cb plane */
>   
>   /*
>    * 2 plane YCbCr MSB aligned

-- 
Best Regard

黄家钗
Sandy Huang
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