linux-kernel - Re: [RFC PATCH 2/8] media: Add P010 format

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Message-ID: <1b2ce01fb04f29cca58d40bd81d9f4cc46dcebf8.camel@ndufresne.ca>
Date:   Mon, 28 Feb 2022 07:48:53 -0500
From:   Nicolas Dufresne <nicolas@...fresne.ca>
To:     Jernej Skrabec <jernej.skrabec@...il.com>,
        ezequiel@...guardiasur.com.ar, p.zabel@...gutronix.de
Cc:     mchehab@...nel.org, hverkuil-cisco@...all.nl,
        gregkh@...uxfoundation.org, wens@...e.org, samuel@...lland.org,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-rockchip@...ts.infradead.org, linux-staging@...ts.linux.dev,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev
Subject: Re: [RFC PATCH 2/8] media: Add P010 format

Le dimanche 27 février 2022 à 15:49 +0100, Jernej Skrabec a écrit :
> Add P010 format, which is commonly used for 10-bit videos.

There is a much more complete patch that was sent previously (with documentation
and all):

https://patchwork.kernel.org/project/linux-rockchip/patch/20210618131526.566762-5-benjamin.gaignard@collabora.com/

regards,
Nicolas

> 
> Signed-off-by: Jernej Skrabec <jernej.skrabec@...il.com>
> ---
>  drivers/media/v4l2-core/v4l2-common.c | 2 ++
>  drivers/media/v4l2-core/v4l2-ioctl.c  | 1 +
>  include/uapi/linux/videodev2.h        | 1 +
>  3 files changed, 4 insertions(+)
> 
> diff --git a/drivers/media/v4l2-core/v4l2-common.c b/drivers/media/v4l2-core/v4l2-common.c
> index 1db0020e08c0..4ede36546e9c 100644
> --- a/drivers/media/v4l2-core/v4l2-common.c
> +++ b/drivers/media/v4l2-core/v4l2-common.c
> @@ -275,6 +275,8 @@ const struct v4l2_format_info *v4l2_format_info(u32 format)
>  		{ .format = V4L2_PIX_FMT_YUV422P, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 3, .bpp = { 1, 1, 1, 0 }, .hdiv = 2, .vdiv = 1 },
>  		{ .format = V4L2_PIX_FMT_GREY,    .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 1, .bpp = { 1, 0, 0, 0 }, .hdiv = 1, .vdiv = 1 },
>  
> +		{ .format = V4L2_PIX_FMT_P010,    .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 2, 4, 0, 0 }, .hdiv = 2, .vdiv = 2 },
> +
>  		/* Tiled YUV formats */
>  		{ .format = V4L2_PIX_FMT_NV12_4L4, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 1, 2, 0, 0 }, .hdiv = 2, .vdiv = 2 },
>  		{ .format = V4L2_PIX_FMT_P010_4L4, .pixel_enc = V4L2_PIXEL_ENC_YUV, .mem_planes = 1, .comp_planes = 2, .bpp = { 2, 4, 0, 0 }, .hdiv = 2, .vdiv = 2 },
> diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
> index 048f326c57b9..a8d999e23e5b 100644
> --- a/drivers/media/v4l2-core/v4l2-ioctl.c
> +++ b/drivers/media/v4l2-core/v4l2-ioctl.c
> @@ -1295,6 +1295,7 @@ static void v4l_fill_fmtdesc(struct v4l2_fmtdesc *fmt)
>  	case V4L2_PIX_FMT_M420:		descr = "YUV 4:2:0 (M420)"; break;
>  	case V4L2_PIX_FMT_NV12:		descr = "Y/CbCr 4:2:0"; break;
>  	case V4L2_PIX_FMT_NV21:		descr = "Y/CrCb 4:2:0"; break;
> +	case V4L2_PIX_FMT_P010:		descr = "10-bit Y/CbCr 4:2:0"; break;
>  	case V4L2_PIX_FMT_NV16:		descr = "Y/CbCr 4:2:2"; break;
>  	case V4L2_PIX_FMT_NV61:		descr = "Y/CrCb 4:2:2"; break;
>  	case V4L2_PIX_FMT_NV24:		descr = "Y/CbCr 4:4:4"; break;
> diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
> index 772dbadd1a24..211bc11a48cb 100644
> --- a/include/uapi/linux/videodev2.h
> +++ b/include/uapi/linux/videodev2.h
> @@ -597,6 +597,7 @@ struct v4l2_pix_format {
>  /* two planes -- one Y, one Cr + Cb interleaved  */
>  #define V4L2_PIX_FMT_NV12    v4l2_fourcc('N', 'V', '1', '2') /* 12  Y/CbCr 4:2:0  */
>  #define V4L2_PIX_FMT_NV21    v4l2_fourcc('N', 'V', '2', '1') /* 12  Y/CrCb 4:2:0  */
> +#define V4L2_PIX_FMT_P010    v4l2_fourcc('P', '0', '1', '0') /* 24  Y/CbCr 4:2:0 10-bit */
>  #define V4L2_PIX_FMT_NV16    v4l2_fourcc('N', 'V', '1', '6') /* 16  Y/CbCr 4:2:2  */
>  #define V4L2_PIX_FMT_NV61    v4l2_fourcc('N', 'V', '6', '1') /* 16  Y/CrCb 4:2:2  */
>  #define V4L2_PIX_FMT_NV24    v4l2_fourcc('N', 'V', '2', '4') /* 24  Y/CbCr 4:4:4  */