linux-kernel - Re: [PATCH v2 1/3] drm: Add some new format DRM_FORMAT_NVXX

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Date:   Wed, 9 Oct 2019 16:50:08 +0200
From:   Daniel Vetter <daniel@...ll.ch>
To:     Sandy Huang <hjc@...k-chips.com>
Cc:     dri-devel@...ts.freedesktop.org,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, heiko@...ech.de,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/3] drm: Add some new format DRM_FORMAT_NVXX_10

On Thu, Sep 26, 2019 at 04:24:47PM +0800, Sandy Huang wrote:
> These new format is supported by some rockchip socs:
> 
> DRM_FORMAT_NV12_10/DRM_FORMAT_NV21_10
> DRM_FORMAT_NV16_10/DRM_FORMAT_NV61_10
> DRM_FORMAT_NV24_10/DRM_FORMAT_NV42_10
> 
> Signed-off-by: Sandy Huang <hjc@...k-chips.com>
> ---
>  drivers/gpu/drm/drm_fourcc.c  | 18 ++++++++++++++++++
>  include/uapi/drm/drm_fourcc.h | 14 ++++++++++++++
>  2 files changed, 32 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_fourcc.c b/drivers/gpu/drm/drm_fourcc.c
> index c630064..ccd78a3 100644
> --- a/drivers/gpu/drm/drm_fourcc.c
> +++ b/drivers/gpu/drm/drm_fourcc.c
> @@ -261,6 +261,24 @@ const struct drm_format_info *__drm_format_info(u32 format)
>  		{ .format = DRM_FORMAT_P016,		.depth = 0,  .num_planes = 2,
>  		  .char_per_block = { 2, 4, 0 }, .block_w = { 1, 0, 0 }, .block_h = { 1, 0, 0 },
>  		  .hsub = 2, .vsub = 2, .is_yuv = true},
> +		{ .format = DRM_FORMAT_NV12_10,		.depth = 0,  .num_planes = 2,
> +		  .char_per_block = { 5, 10, 0 }, .block_w = { 4, 4, 0 }, .block_h = { 4, 4, 0 },
> +		  .hsub = 2, .vsub = 2, .is_yuv = true},
> +		{ .format = DRM_FORMAT_NV21_10,		.depth = 0,  .num_planes = 2,
> +		  .char_per_block = { 5, 10, 0 }, .block_w = { 4, 4, 0 }, .block_h = { 4, 4, 0 },
> +		  .hsub = 2, .vsub = 2, .is_yuv = true},
> +		{ .format = DRM_FORMAT_NV16_10,		.depth = 0,  .num_planes = 2,
> +		  .char_per_block = { 5, 10, 0 }, .block_w = { 4, 4, 0 }, .block_h = { 4, 4, 0 },
> +		  .hsub = 2, .vsub = 1, .is_yuv = true},
> +		{ .format = DRM_FORMAT_NV61_10,		.depth = 0,  .num_planes = 2,
> +		  .char_per_block = { 5, 10, 0 }, .block_w = { 4, 4, 0 }, .block_h = { 4, 4, 0 },
> +		  .hsub = 2, .vsub = 1, .is_yuv = true},
> +		{ .format = DRM_FORMAT_NV24_10,		.depth = 0,  .num_planes = 2,
> +		  .char_per_block = { 5, 10, 0 }, .block_w = { 4, 4, 0 }, .block_h = { 4, 4, 0 },
> +		  .hsub = 1, .vsub = 1, .is_yuv = true},
> +		{ .format = DRM_FORMAT_NV42_10,		.depth = 0,  .num_planes = 2,
> +		  .char_per_block = { 5, 10, 0 }, .block_w = { 4, 4, 0 }, .block_h = { 4, 4, 0 },
> +		  .hsub = 1, .vsub = 1, .is_yuv = true},
>  		{ .format = DRM_FORMAT_P210,		.depth = 0,
>  		  .num_planes = 2, .char_per_block = { 2, 4, 0 },
>  		  .block_w = { 1, 0, 0 }, .block_h = { 1, 0, 0 }, .hsub = 2,

Yup this is what I had in mind with using the block stuff to describe your
new 10bit yuv formats. Thanks for respining.

Once we've nailed the exact bit description of the format precisely this
can be merged imo.
-Daniel

> diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h
> index 3feeaa3..08e2221 100644
> --- a/include/uapi/drm/drm_fourcc.h
> +++ b/include/uapi/drm/drm_fourcc.h
> @@ -238,6 +238,20 @@ extern "C" {
>  #define DRM_FORMAT_NV42		fourcc_code('N', 'V', '4', '2') /* non-subsampled Cb:Cr plane */
>  
>  /*
> + * 2 plane YCbCr
> + * index 0 = Y plane, Y3:Y2:Y1:Y0 10:10:10:10
> + * index 1 = Cb:Cr plane, Cb3:Cr3:Cb2:Cr2:Cb1:Cr1:Cb0:Cr0 10:10:10:10:10:10:10:10
> + * or
> + * index 1 = Cr:Cb plane, Cr3:Cb3:Cr2:Cb2:Cr1:Cb1:Cr0:Cb0 10:10:10:10:10:10:10:10
> + */
> +#define DRM_FORMAT_NV12_10	fourcc_code('N', 'A', '1', '2') /* 2x2 subsampled Cr:Cb plane */
> +#define DRM_FORMAT_NV21_10	fourcc_code('N', 'A', '2', '1') /* 2x2 subsampled Cb:Cr plane */
> +#define DRM_FORMAT_NV16_10	fourcc_code('N', 'A', '1', '6') /* 2x1 subsampled Cr:Cb plane */
> +#define DRM_FORMAT_NV61_10	fourcc_code('N', 'A', '6', '1') /* 2x1 subsampled Cb:Cr plane */
> +#define DRM_FORMAT_NV24_10	fourcc_code('N', 'A', '2', '4') /* non-subsampled Cr:Cb plane */
> +#define DRM_FORMAT_NV42_10	fourcc_code('N', 'A', '4', '2') /* non-subsampled Cb:Cr plane */
> +
> +/*
>   * 2 plane YCbCr MSB aligned
>   * index 0 = Y plane, [15:0] Y:x [10:6] little endian
>   * index 1 = Cr:Cb plane, [31:0] Cr:x:Cb:x [10:6:10:6] little endian
> -- 
> 2.7.4
> 
> 
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch