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

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Message-ID: <20190929032630.GA26869@jamwan02-TSP300>
Date:   Sun, 29 Sep 2019 03:26:38 +0000
From:   "james qian wang (Arm Technology China)" <james.qian.wang@....com>
To:     Sandy Huang <hjc@...k-chips.com>
CC:     "dri-devel@...ts.freedesktop.org" <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>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        nd <nd@....com>
Subject: Re: [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 },

Hi Sandy:

Their is a problem here for char_per_block size of plane[0]:

Since: 5 * 8 != 4 * 4 * 10;

Seems you mis-set the block_w/h, per your block size the block is 2x2, and it should be:

 .char_per_block = { 5, 10, 0 }, .block_w = { 2, 2, 0 }, .block_h = { 2, 2, 0 },


Best Regards:
James

> +		  .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,
> 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