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Date:   Sun, 15 Nov 2020 19:59:24 +0100 (CET)
From:   Martin Cerveny <martin@c-home.cz>
Reply-To: Martin Cerveny <M.Cerveny@computer.org>
To:     Hans Verkuil <hverkuil@xs4all.nl>
cc:     Martin Cerveny <m.cerveny@computer.org>,
        Maxime Ripard <mripard@kernel.org>,
        Chen-Yu Tsai <wens@csie.org>, devel@driverdev.osuosl.org,
        devicetree@vger.kernel.org,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        linux-media@vger.kernel.org,
        Mauro Carvalho Chehab <mchehab@kernel.org>,
        Paul Kocialkowski <paul.kocialkowski@bootlin.com>,
        Rob Herring <robh+dt@kernel.org>
Subject: Re: [PATCH v2 0/6] ARM: dts: sun8i: v3s: Enable video decoder
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References: <20200912143052.30952-1-m.cerveny@computer.org> <c8cc3529-3e21-2a11-d258-bb03885a5c91@xs4all.nl>
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Hello.

On Thu, 5 Nov 2020, Hans Verkuil wrote:

> Hi Martin,
>
> On 12/09/2020 16:30, Martin Cerveny wrote:
>> First patch extends cedrus capability to all decoders
>> because V3s missing MPEG2 decoder.
>>
>> Next two patches add system control node (SRAM C1) and
>> next three patches add support for Cedrus VPU.
>>
>> Tested on "Lichee Zero" V3s platform with testing LCD patch
>> ( https://github.com/mcerveny/linux/tree/v3s_videocodec_v4 )
>> and V4L2 raw API testing utility
>> ( https://github.com/mcerveny/v4l2-request-test ):
>> - enabled LCD (DRM dual VI and sigle UI planes)
>> - added RGB panel
>> - enabled PWM
>>
>> There is low memory on V3s (64MB) and maximum must be available to CMA:
>> - CONFIG_CMA_SIZE_MBYTES=28
>> - add swap to swapout other processes
>> - decrease buffers in v4l2-request-test (.buffers_count from 16 to 6)
>>
>> Only H.264 decoder working - MPEG and H.265 unsupported by V3s,
>> JPEG/MJPEG still unimplemented, encoder unimplemented
>
> When I tried to merged these patches I got merge conflicts.
>
> Possibly due to other 5.10 changes, but certainly because of conflicts
> with patches from Jernej:
>
> https://patchwork.linuxtv.org/project/linux-media/patch/20200825173523.1289379-4-jernej.skrabec@siol.net/
> https://patchwork.linuxtv.org/project/linux-media/patch/20200825173523.1289379-5-jernej.skrabec@siol.net/
>
> I've merged Jerne's patches and posted a PR for that:
> https://patchwork.linuxtv.org/project/linux-media/patch/f3b8e5e2-5f0e-fb6f-e5b2-7f44f7e365e7@xs4all.nl/
>
> Can you rebase your patches on top of my branch that contains Jernej's patches?
>
> https://git.linuxtv.org/hverkuil/media_tree.git/log/?h=for-v5.11e
>
> Once my PR is merged into the media_tree master I can take your rebased
> patches.

I updated patches:
https://github.com/mcerveny/linux/tree/media_tree_for-v5.11e

BUT, commit (555 commits) for v5.10-1
https://github.com/torvalds/linux/commit/fd5c32d80884268a381ed0e67cccef0b3d37750b
disrupts usability of Cedrus H.264 (at least for my Allwinner V3s):

1) colors are disrupted

There are missing some initialization now.

If I use "5.9" compatible code
(last bisect good point https://github.com/torvalds/linux/commit/647412daeb454b6dad12a6c6961ab90aac9e5d29 )
then reboot (not power-off!) and use new code 
( https://github.com/mcerveny/linux/tree/media_tree_for-v5.11e )
and colors are OK.

2) decoding of complex streams fails

( https://github.com/mcerveny/v4l2-request-test/tree/v5.10 )
- bbb-h264-all-i-32 - OK
- bbb-h264-32 - bad from frame 5
- bbb-h264-high-32 - bad from frame 6

best regards,
Martin

>> Changes since v1:
>> - patch 0005 rename
>> - added testing description
>>
>> Martin Cerveny (6):
>>   media: cedrus: Register all codecs as capability
>>   dt-bindings: sram: allwinner,sun4i-a10-system-control: Add V3s
>>     compatibles
>>   ARM: dts: sun8i: v3s: Add node for system control
>>   media: cedrus: Add support for V3s
>>   dt-bindings: media: cedrus: Add V3s compatible
>>   ARM: dts: sun8i: v3s: Add video engine node
>>
>>  .../allwinner,sun4i-a10-video-engine.yaml     |  1 +
>>  .../allwinner,sun4i-a10-system-control.yaml   |  6 ++++
>>  arch/arm/boot/dts/sun8i-v3s.dtsi              | 33 +++++++++++++++++++
>>  drivers/staging/media/sunxi/cedrus/cedrus.c   | 28 +++++++++++++++-
>>  drivers/staging/media/sunxi/cedrus/cedrus.h   |  2 ++
>>  .../staging/media/sunxi/cedrus/cedrus_video.c |  2 ++
>>  6 files changed, 71 insertions(+), 1 deletion(-)
>>
>