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Message-ID: <d4ccf803-3736-d95d-19a9-f3593465b81e@xs4all.nl>
Date: Mon, 17 Jan 2022 10:28:38 +0100
From: Hans Verkuil <hverkuil-cisco@...all.nl>
To: Jammy Huang <jammy_huang@...eedtech.com>,
Joel Stanley <joel@....id.au>
Cc: "sakari.ailus@...ux.intel.com" <sakari.ailus@...ux.intel.com>,
"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
"eajames@...ux.ibm.com" <eajames@...ux.ibm.com>,
"mchehab@...nel.org" <mchehab@...nel.org>,
"andrew@...id.au" <andrew@...id.au>,
"linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
"openbmc@...ts.ozlabs.org" <openbmc@...ts.ozlabs.org>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
"linux-aspeed@...ts.ozlabs.org" <linux-aspeed@...ts.ozlabs.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v8 1/4] media: v4l: Add definition for the Aspeed JPEG
format
Hi Jammy,
On 1/17/22 08:18, Jammy Huang wrote:
> On 2022/1/17 上午 10:24, Joel Stanley wrote:
>> On Mon, 17 Jan 2022 at 02:00, Jammy Huang <jammy_huang@...eedtech.com> wrote:
>>> Hi Hans,
>>>
>>> On 2022/1/14 下午 04:11, Hans Verkuil wrote:
>>>> 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
>>> Thanks, I just used git format-patch to generate the cover-letter and
>>> didn't notice this.
>>>
>>> It looks like the file, pixfmt-reserved.rst, has different path in
>>> different Linux kernel,
>>>
>>> * 5.4: Documentation/media/uapi/v4l/pixfmt-reserved.rst
>>>
>>> * 5.10/5.15: Documentation/userspace-api/media/v4l/pixfmt-reserved.rst
>>>
>>> 5.4 is the one I based to submit the patches.
>>>
>>> Could you suggest the kernel that I should based to submit these patches??
>> You should always submit based on the latest release.
>>
>> There are sometimes exceptions where you will base your patches on
>> something even newer, but generally you should grab the latest.
>>
>> Be sure to re-test on the latest kernel before submitting.
> OK, thank you.
I recommend waiting until later this week. I hope to have a PR for other outstanding
aspeed patches ready in a few days. It is easiest if you base your v9 on top of that
series, this to avoid merge conflicts.
Regards,
Hans
>>
>> Cheers,
>>
>> Joel
>>
>>> I will need to change the number of V4L2_CID_USER_ASPEED_BASE per different
>>>
>>> linux kernel as well.
>>>
>>>> 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 */
>>> --
>>> Best Regards
>>> Jammy
>>>
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