Message-ID: <e61856d5-c371-ab52-2814-d0d8aabee0f0@aspeedtech.com>
Date:   Tue, 7 Dec 2021 11:03:00 +0800
From:   Jammy Huang <jammy_huang@...eedtech.com>
To:     Hans Verkuil <hverkuil-cisco@...all.nl>,
        "eajames@...ux.ibm.com" <eajames@...ux.ibm.com>,
        "mchehab@...nel.org" <mchehab@...nel.org>,
        "joel@....id.au" <joel@....id.au>,
        "andrew@...id.au" <andrew@...id.au>,
        "sakari.ailus@...ux.intel.com" <sakari.ailus@...ux.intel.com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "laurent.pinchart@...asonboard.com" 
        <laurent.pinchart@...asonboard.com>,
        "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 v5 00/10] add aspeed-jpeg support for aspeed-video

Hi Hans,

The implementation of decoder for this format as been available here.
https://github.com/AspeedTech-BMC/aspeed_codec

On 2021/12/2 上午 09:29, Jammy Huang wrote:
> Hi Hans,
>
> Thanks for your review and suggestions.
>
> On 2021/11/26 下午 05:51, Hans Verkuil wrote:
>> On 26/11/2021 09:17, Jammy Huang wrote:
>>> Hi Hans,
>>>
>>> Please refer to Page 132, 'Video stream data format – ASPEED mode compression' of
>>> https://github.com/AspeedTech-BMC/openbmc/releases/download/v07.02/SDK_User_Guide_v07.02.pdf
>>>
>>> Is above information enough??
>> Hmm, close. It would need some additional information, possibly documented in the source
>> code:
>>
>> - What is the Frame Header? (the doc just says that it is different, but not what it actually is)
>> - What is the EOI code? Is it equal to 'FEND'? (not quite clear to me)
>>
>> I think the documentation looks sufficient once those two items are addressed.
> Information you mentioned will be included in next revision,
> "SDK_User_Guide_v07.03.pdf".
> The releases will be updated to
> https://github.com/AspeedTech-BMC/openbmc/releases
>>> Or maybe we can postpone this series until the source code for this format ready.
>>> I think I can accomplish it by the end of this year.
>> That's quite soon, so perhaps that would be the best approach. That way you also
>> know exactly what information is missing from the SDK User Guide, and if that is
>> documented, then this format can be used in the kernel.
>>
>> But several of the patches in the series are independent of the new jpeg format,
>> so it might be useful to get those in first.
> Understood. For the patches below, I will resend except for patch
> 5/6/8/10 which are closely
> relative to aspeed jpeg format.
>
>      1. media: aspeed: move err-handling together to the bottom
>      2. media: aspeed: use v4l2_info/v4l2_warn/v4l2_dbg for log
>      3. media: aspeed: add more debug log messages
>      4. media: aspeed: refactor to gather format/compress settings
>      5. media: v4l: Add definition for the Aspeed JPEG format
>      6. media: v4l2-ctrls: Reserve controls for ASPEED
>      7. media: aspeed: use model-data
>      8. media: aspeed: Support aspeed mode to reduce compressed data
>      9. media: aspeed: add comments and macro
>      10.media: aspeed: Extend debug message
>
>
>
>> Regards,
>>
>> 	Hans
>>
>>> On 2021/11/25 下午 10:31, Hans Verkuil wrote:
>>>> Hi Jammy,
>>>>
>>>> I suggest posting a v3 that moves the patches that deal with the
>>>> Aspeed JPEG format to the end of the series. That way I can easily
>>>> merge the patches up to that point, and the Aspeed JPEG support can
>>>> be handled separately.
>>>>
>>>> I'm not sure if it can be merged without that format being documented,
>>>> either in pixfmt-reserved.rst, by implementing support for it in
>>>> libv4lconvert from v4l-utils, or by providing a URL to some other
>>>> publicly available source code. We really don't like adding pixel
>>>> formats that cannot be interpreted by someone without access to the
>>>> datasheets.
>>>>
>>>> Regards,
>>>>
>>>> 	Hans
>>>>
>>>> On 18/11/2021 08:40, Jammy Huang wrote:
>>>>> The aim of this series is to add aspeed-jpeg support for aspeed-video
>>>>> driver.
>>>>>
>>>>> To achieve this major goal some refactors are included.
>>>>>
>>>>> In the last, debugfs information is also updated per this change.
>>>>>
>>>>> Changes in v5:
>>>>>     - Use model data to tell different soc
>>>>>
>>>>> Changes in v4:
>>>>>     - Add definition for the Aspeed JPEG format
>>>>>     - Reserve controls for ASPEED
>>>>>     - Use s_fmt to update format rather than new control
>>>>>     - Update aspeed hq quality range, 1 ~ 12
>>>>>
>>>>>
>>>>> Jammy Huang (10):
>>>>>      media: aspeed: move err-handling together to the bottom
>>>>>      media: aspeed: use v4l2_info/v4l2_warn/v4l2_dbg for log
>>>>>      media: aspeed: add more debug log messages
>>>>>      media: aspeed: refactor to gather format/compress settings
>>>>>      media: v4l: Add definition for the Aspeed JPEG format
>>>>>      media: v4l2-ctrls: Reserve controls for ASPEED
>>>>>      media: aspeed: use model-data
>>>>>      media: aspeed: Support aspeed mode to reduce compressed data
>>>>>      media: aspeed: add comments and macro
>>>>>      media: aspeed: Extend debug message
>>>>>
>>>>>     .../media/uapi/v4l/pixfmt-reserved.rst        |  12 +
>>>>>     drivers/media/platform/aspeed-video.c         | 534 ++++++++++++++----
>>>>>     drivers/media/v4l2-core/v4l2-ioctl.c          |   1 +
>>>>>     include/uapi/linux/aspeed-video.h             |  15 +
>>>>>     include/uapi/linux/v4l2-controls.h            |   5 +
>>>>>     include/uapi/linux/videodev2.h                |   1 +
>>>>>     6 files changed, 467 insertions(+), 101 deletions(-)
>>>>>     create mode 100644 include/uapi/linux/aspeed-video.h
>>>>>
-- 
Best Regards
Jammy

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