linux-kernel - Re: [PATCH 0/2] media: cedrus: fix HEVC decoding

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Date:   Thu, 16 Jun 2022 09:14:05 +0200
From:   Hans Verkuil <hverkuil-cisco@...all.nl>
To:     Jernej Skrabec <jernej.skrabec@...il.com>, mripard@...nel.org,
        paul.kocialkowski@...tlin.com
Cc:     mchehab@...nel.org, wens@...e.org, samuel@...lland.org,
        benjamin.gaignard@...labora.com, nicolas.dufresne@...labora.com,
        gregkh@...uxfoundation.org, linux-media@...r.kernel.org,
        linux-staging@...ts.linux.dev,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] media: cedrus: fix HEVC decoding



On 6/15/22 22:44, Jernej Skrabec wrote:
> After detailed comparison of register names to vendor library I noticed
> that one register has completely different name. After some testing I
> discovered that it was misnamed and used incorrectly. This patch series
> fixes it. With that, 3 more reference bitstreams are now correctly
> decoded. It is also possible that this fixes instability issue I had
> after decoding such bitstreams. Running Fluster test suite very often
> locked up my board, but after applying this fix, I never experienced it
> again. It might still be completely coincidental, but I doubt this is
> the case.
> 
> Note: Patch 2 clashes with HEVC uAPI destaging. In current form, it can
> be easily backported. However, there are few users of Cedrus HEVC and
> skipping this fix wouldn't be that bad.
> 
> Please let me know which way to go:
> 1) wait for destaging, send rebased v2 and not care about backporting

Let's go with 1. There is not much point in backporting since destaging
the HEVC API will also change it, so userspace will need to adapt. It's
a staging driver anyway (although hopefully not for long).

If you post a v2 on top of the latest series from Benjamin, then that
should almost certainly work fine when Benjamin posts what will hopefully
be the final version of his series. When it is all OK, then I put both in
the same PR.

Regards,

	Hans

> 2) merge before destaging, but v9 of HEVC uAPI destaging would need to
>    be rebased.
> 3) something else?
> 
> Best regards,
> Jernej
> 
> Jernej Skrabec (2):
>   media: cedrus: h265: Fix flag name
>   media: cedrus: h265: Fix logic for not low delay flag
> 
>  .../staging/media/sunxi/cedrus/cedrus_h265.c  | 29 ++++++++++++++++++-
>  .../staging/media/sunxi/cedrus/cedrus_regs.h  |  3 +-
>  2 files changed, 29 insertions(+), 3 deletions(-)
>