linux-kernel - Re: [PATCH v5 00/14] media: mtk-vcodec: support for MT8183 decoder

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Message-ID: <7d485a28-c03d-ec54-7a83-022074a0c042@xs4all.nl>
Date:   Thu, 27 May 2021 12:18:43 +0200
From:   Hans Verkuil <hverkuil-cisco@...all.nl>
To:     Alexandre Courbot <acourbot@...omium.org>
Cc:     Tiffany Lin <tiffany.lin@...iatek.com>,
        Andrew-CT Chen <andrew-ct.chen@...iatek.com>,
        Dafna Hirschfeld <dafna.hirschfeld@...labora.com>,
        Yunfei Dong <yunfei.dong@...iatek.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH v5 00/14] media: mtk-vcodec: support for MT8183 decoder

On 27/05/2021 12:10, Alexandre Courbot wrote:
> On Thu, May 27, 2021 at 5:08 PM Hans Verkuil <hverkuil-cisco@...all.nl> wrote:
>>
>> Hi Alexandre,
>>
>> On 19/05/2021 16:29, Alexandre Courbot wrote:
>>> This series adds support for the stateless API into mtk-vcodec, by first
>>> separating the stateful ops into their own source file, and introducing
>>> a new set of ops suitable for stateless decoding. As such, support for
>>> stateful decoders should remain completely unaffected.
>>>
>>> This series has been tested with both MT8183 and MT8173. Decoding was
>>> working for both chips, and in the case of MT8173 no regression has been
>>> spotted.
>>>
>>> Patches 1-5 fix a few compliance issues with the decoder and encoder, most
>>> notably by adding support for the START and STOP command for the latter. These
>>> patches were last in the previous series but have been moved to the beginning so
>>> they can be applied sooner.
>>>
>>> Patches 6-9 separates the "stateful" part of the driver into its own file and
>>> add support for the new firmware and pixel format used by MT8183.
>>>
>>> Patches 10-14 add support for H.264 stateless decoding and MT8183.
>>>
>>> Changes since v4:
>>> * Moved compliance fix patches to the head of the series.
>>> * Select MEDIA_CONTROLLER_REQUEST_API.
>>> * Properly capitalize MM21's format description string.
>>> * Reorganize stateless code as suggested by Hans.
>>> * Fix compilation errors when DEBUG is defined.
>>> * Merge double-free fixup patch into the patch that introduced the issue (was
>>>   a separate patch coming right after the one introducing the issue).
>>>
>>> Changes since v3:
>>> * Stop checking that controls are set for every request.
>>> * Add V4L2_CID_STATELESS_H264_START_CODE control.
>>> * Stop mapping OUTPUT buffers and getting the NAL type from them, use the
>>>   nal_ref_idc field instead.
>>> * Make V4L2_CID_MIN_BUFFERS_FOR_CAPTURE control stateful-only.
>>> * Set vb2_buffer's field to V4L2_FIELD_NONE in buffer validation hook.
>>>
>>> Changes since v2:
>>> * Add follow-up patches fixing support for START/STOP commands for the
>>>   encoder, and stateful decoder.
>>>
>>> Alexandre Courbot (8):
>>>   media: mtk-vcodec: vdec: use helpers in VIDIOC_(TRY_)DECODER_CMD
>>>   media: mtk-vcodec: vdec: clamp OUTPUT resolution to hardware limits
>>>   media: mtk-vcodec: make flush buffer reusable by encoder
>>>   media: mtk-vcodec: venc: support START and STOP commands
>>>   media: mtk-vcodec: vdec: handle firmware version field
>>>   media: mtk-vcodec: support version 2 of decoder firmware ABI
>>>   media: add Mediatek's MM21 format
>>>   dt-bindings: media: document mediatek,mt8183-vcodec-dec
>>>
>>> Hirokazu Honda (1):
>>>   media: mtk-vcodec: vdec: Support H264 profile control
>>>
>>> Yunfei Dong (5):
>>>   media: mtk-vcodec: vdec: move stateful ops into their own file
>>>   media: mtk-vcodec: vdec: support stateless API
>>>   media: mtk-vcodec: vdec: support stateless H.264 decoding
>>>   media: mtk-vcodec: vdec: add media device if using stateless api
>>>   media: mtk-vcodec: enable MT8183 decoder
>>
>> Running scripts/checkpatch.pl --strict over this patch series gives
>> a lot of warnings and checks. A lot of these look like they are easy
>> to fix and reasonable.
> 
> Apologies, I forgot to use --strict. It's not pretty indeed. I've
> fixed most of the problems reported ; a few are more tricky or would
> require extra cleanup patches like converting e.g. uint32_t to u32
> when adding a member to a struct, which would make sense if we convert
> all members of the struct (or better, the whole driver) separately.
> Hopefully these can be overlooked for the time being.

Fair enough, just mention that in the cover letter.

Regards,

	Hans

>