linux-kernel - Re: [PATCH v11 1/5] media: v4l: Add definition for the Aspeed JPEG format

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Message-ID: <Y4oKdBApOGk9TUHO@paasikivi.fi.intel.com>
Date:   Fri, 2 Dec 2022 14:23:48 +0000
From:   Sakari Ailus <sakari.ailus@...ux.intel.com>
To:     Jammy Huang <jammy_huang@...eedtech.com>
Cc:     eajames@...ux.ibm.com, mchehab@...nel.org, joel@....id.au,
        andrew@...id.au, hverkuil-cisco@...all.nl,
        laurent.pinchart@...asonboard.com, xavier.roumegue@....nxp.com,
        ezequiel@...guardiasur.com.ar, stanimir.varbanov@...aro.org,
        nicolas.dufresne@...labora.com, ming.qian@....com,
        andrzej.p@...labora.com, 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 v11 1/5] media: v4l: Add definition for the Aspeed JPEG
 format

Hi Jammy,

Apologies for a late reply.

On Fri, Oct 28, 2022 at 10:35:50AM +0800, 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>
> ---
> v11:
>   - no update
> v10:
>   - no update
> v9:
>   - Rebase on new kernel
> 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
> ---
>  .../userspace-api/media/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/userspace-api/media/v4l/pixfmt-reserved.rst b/Documentation/userspace-api/media/v4l/pixfmt-reserved.rst
> index 0ff68cd8cf62..73cd99828010 100644
> --- a/Documentation/userspace-api/media/v4l/pixfmt-reserved.rst
> +++ b/Documentation/userspace-api/media/v4l/pixfmt-reserved.rst
> @@ -258,6 +258,23 @@ please make a proposal on the linux-media mailing list.
>          and it is used by various multimedia hardware blocks like GPU, display
>          controllers, ISP and video accelerators.
>          It contains four planes for progressive video.
> +    * .. _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.

What does this refer to? If it's a URL, please add a reference as below.

Also please run this on the patches:

	$ scripts/checkpatch.pl --strict --max-line-length=80

> +
> +        Decoder's implementation can be found here,
> +        `aspeed_codec <https://github.com/AspeedTech-BMC/aspeed_codec/>`__
>  .. raw:: latex
>  
>      \normalsize
> diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
> index fddba75d9074..8cb4b976064e 100644
> --- a/drivers/media/v4l2-core/v4l2-ioctl.c
> +++ b/drivers/media/v4l2-core/v4l2-ioctl.c
> @@ -1497,6 +1497,7 @@ static void v4l_fill_fmtdesc(struct v4l2_fmtdesc *fmt)
>  		case V4L2_PIX_FMT_MT21C:	descr = "Mediatek Compressed Format"; break;
>  		case V4L2_PIX_FMT_QC08C:	descr = "QCOM Compressed 8-bit Format"; break;
>  		case V4L2_PIX_FMT_QC10C:	descr = "QCOM Compressed 10-bit 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 86cae23cc446..870a7e5ef8ca 100644
> --- a/include/uapi/linux/videodev2.h
> +++ b/include/uapi/linux/videodev2.h
> @@ -775,6 +775,7 @@ struct v4l2_pix_format {
>  #define V4L2_PIX_FMT_HI240    v4l2_fourcc('H', 'I', '2', '4') /* BTTV 8-bit dithered RGB */
>  #define V4L2_PIX_FMT_QC08C    v4l2_fourcc('Q', '0', '8', 'C') /* Qualcomm 8-bit compressed */
>  #define V4L2_PIX_FMT_QC10C    v4l2_fourcc('Q', '1', '0', 'C') /* Qualcomm 10-bit compressed */
> +#define V4L2_PIX_FMT_AJPG     v4l2_fourcc('A', 'J', 'P', 'G') /* Aspeed JPEG */
>  
>  /* 10bit raw 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 */

-- 
Kind regards,

Sakari Ailus