linux-kernel - Re: [PATCH v8 1/4] media: v4l: Add definition for the Aspeed JPEG format

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Message-ID: <703ff71e-c76a-9df1-c644-04efed0199ca@xs4all.nl>
Date:   Fri, 14 Jan 2022 09:11:37 +0100
From:   Hans Verkuil <hverkuil-cisco@...all.nl>
To:     Jammy Huang <jammy_huang@...eedtech.com>,
        sakari.ailus@...ux.intel.com, gregkh@...uxfoundation.org,
        eajames@...ux.ibm.com, mchehab@...nel.org, joel@....id.au,
        andrew@...id.au, linux-media@...r.kernel.org,
        openbmc@...ts.ozlabs.org, linux-arm-kernel@...ts.infradead.org,
        linux-aspeed@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8 1/4] media: v4l: Add definition for the Aspeed JPEG
 format

On 24/12/2021 02:27, Jammy Huang wrote:
> This introduces support for the Aspeed JPEG format, where the new frame
> can refer to previous frame to reduce the amount of compressed data. The
> concept is similar to I/P frame of video compression. It will compare the
> new frame with previous one to decide which macroblock's data is
> changed, and only the changed macroblocks will be compressed.
> 
> This Aspeed JPEG format is used by the video engine on Aspeed platforms,
> which is generally adapted for remote KVM.
> 
> Signed-off-by: Jammy Huang <jammy_huang@...eedtech.com>
> ---
> v8:
>   - Add decoder information for aspeed-jpeg
> v7:
>   - Add more information for aspeed-jpeg
> v6:
>   - Update description for new format, aspeed-jpeg, in Documentation.
> v5:
>   - no update
> v4:
>   - new
> ---
>  .../media/uapi/v4l/pixfmt-reserved.rst          | 17 +++++++++++++++++
>  drivers/media/v4l2-core/v4l2-ioctl.c            |  1 +
>  include/uapi/linux/videodev2.h                  |  1 +
>  3 files changed, 19 insertions(+)
> 
> diff --git a/Documentation/media/uapi/v4l/pixfmt-reserved.rst b/Documentation/media/uapi/v4l/pixfmt-reserved.rst

This is the wrong file! It should be:

Documentation/userspace-api/media/v4l/pixfmt-reserved.rst

Regards,

	Hans

> index b2cd155e691b..1d0dc8d86ed7 100644
> --- a/Documentation/media/uapi/v4l/pixfmt-reserved.rst
> +++ b/Documentation/media/uapi/v4l/pixfmt-reserved.rst
> @@ -264,6 +264,23 @@ please make a proposal on the linux-media mailing list.
>  	of tiles, resulting in 32-aligned resolutions for the luminance plane
>  	and 16-aligned resolutions for the chrominance plane (with 2x2
>  	subsampling).
> +    * .. _V4L2-PIX-FMT-AJPG:
> +
> +      - ``V4L2_PIX_FMT_AJPG``
> +      - 'AJPG'
> +      - ASPEED JPEG format used by the aspeed-video driver on Aspeed platforms,
> +        which is generally adapted for remote KVM.
> +        On each frame compression, I will compare the new frame with previous
> +        one to decide which macroblock's data is changed, and only the changed
> +        macroblocks will be compressed.
> +
> +        The implementation is based on AST2600 A3 datasheet, revision 0.9, which
> +        is not publicly available. Or you can reference Video stream data format
> +        – ASPEED mode compression of SDK_User_Guide which available on
> +        AspeedTech-BMC/openbmc/releases.
> +
> +        Decoder's implementation can be found here,
> +        `https://github.com/AspeedTech-BMC/aspeed_codec/ <https://github.com/AspeedTech-BMC/aspeed_codec/>`__
>  
>  .. tabularcolumns:: |p{6.6cm}|p{2.2cm}|p{8.7cm}|
>  
> diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
> index 24db33f803c0..00dde01d2f97 100644
> --- a/drivers/media/v4l2-core/v4l2-ioctl.c
> +++ b/drivers/media/v4l2-core/v4l2-ioctl.c
> @@ -1378,6 +1378,7 @@ static void v4l_fill_fmtdesc(struct v4l2_fmtdesc *fmt)
>  		case V4L2_PIX_FMT_S5C_UYVY_JPG:	descr = "S5C73MX interleaved UYVY/JPEG"; break;
>  		case V4L2_PIX_FMT_MT21C:	descr = "Mediatek Compressed Format"; break;
>  		case V4L2_PIX_FMT_SUNXI_TILED_NV12: descr = "Sunxi Tiled NV12 Format"; break;
> +		case V4L2_PIX_FMT_AJPG:		descr = "Aspeed JPEG"; break;
>  		default:
>  			if (fmt->description[0])
>  				return;
> diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
> index 3210b3c82a4a..994eb6155ea9 100644
> --- a/include/uapi/linux/videodev2.h
> +++ b/include/uapi/linux/videodev2.h
> @@ -726,6 +726,7 @@ struct v4l2_pix_format {
>  #define V4L2_PIX_FMT_INZI     v4l2_fourcc('I', 'N', 'Z', 'I') /* Intel Planar Greyscale 10-bit and Depth 16-bit */
>  #define V4L2_PIX_FMT_SUNXI_TILED_NV12 v4l2_fourcc('S', 'T', '1', '2') /* Sunxi Tiled NV12 Format */
>  #define V4L2_PIX_FMT_CNF4     v4l2_fourcc('C', 'N', 'F', '4') /* Intel 4-bit packed depth confidence information */
> +#define V4L2_PIX_FMT_AJPG     v4l2_fourcc('A', 'J', 'P', 'G') /* Aspeed JPEG */
>  
>  /* 10bit raw bayer packed, 32 bytes for every 25 pixels, last LSB 6 bits unused */
>  #define V4L2_PIX_FMT_IPU3_SBGGR10	v4l2_fourcc('i', 'p', '3', 'b') /* IPU3 packed 10-bit BGGR bayer */