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Subject: Re: [PATCH 1/2] drm/fourcc: add a 10bits fully packed variant of NV12
To:     Randy Li <ayaka@soulik.info>, dri-devel@lists.freedesktop.org
Cc:     hjc@rock-chips.com, heiko@sntech.de,
        linux-arm-kernel@lists.infradead.org,
        linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org,
        nicolas.dufresne@collabora.com, gustavo@padovan.org,
        seanpaul@chromium.org, airlied@linux.ie
References: <20180520171705.29690-1-ayaka@soulik.info>
 <20180520171705.29690-2-ayaka@soulik.info>
From:   Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Message-ID: <303c89b8-e24f-cacb-c305-65d17c58c597@linux.intel.com>
Date:   Tue, 22 May 2018 11:26:12 +0200
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Op 20-05-18 om 19:17 schreef Randy Li:
> This pixel format is a fully packed and 10bits variant of NV12.
> A luma pixel would take 10bits in memory, without any
> filled bits between pixels in a stride. The color gamut
> follows the BT.2020 standard.
>
> Signed-off-by: Randy Li <ayaka@soulik.info>
> ---
>  drivers/gpu/drm/drm_fourcc.c  | 1 +
>  include/uapi/drm/drm_fourcc.h | 3 +++
>  2 files changed, 4 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_fourcc.c b/drivers/gpu/drm/drm_fourcc.c
> index 5ca6395cd4d3..1f43967c4013 100644
> --- a/drivers/gpu/drm/drm_fourcc.c
> +++ b/drivers/gpu/drm/drm_fourcc.c
> @@ -173,6 +173,7 @@ 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_NV12_10LE40,	.depth = 0,  .num_planes = 2, .cpp = { 1, 2, 0 }, .hsub = 2, .vsub = 2 },
Hm, the cpp value might give problems because it rounds down, not sure how we should handle that? Set to zero?
>  	};
>  
>  	unsigned int i;
> diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h
> index e04613d30a13..8eabf01e966f 100644
> --- a/include/uapi/drm/drm_fourcc.h
> +++ b/include/uapi/drm/drm_fourcc.h
> @@ -140,6 +140,9 @@ extern "C" {
>  #define DRM_FORMAT_NV61		fourcc_code('N', 'V', '6', '1') /* 2x1 subsampled Cb:Cr plane */
>  #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 */
> +/* A fully packed variant of NV12_10LE32 */
> +#define DRM_FORMAT_NV12_10LE40	fourcc_code('R', 'K', '2', '0') /* 2x2 subsampled Cr:Cb plane */
> +
>  
>  /*
>   * 3 plane YCbCr