linux-kernel - Re: [BUG REPORT] media: coda: mpeg4 decode corruption on i.MX6qp only

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Message-ID: <CAGngYiX2tQ3egFX0CZSMd8QBG_-FuXCWL9R1whu77J7ZE+M_+w@mail.gmail.com>
Date:   Wed, 10 Feb 2021 13:11:17 -0500
From:   Sven Van Asbroeck <thesven73@...il.com>
To:     Nicolas Dufresne <nicolas@...fresne.ca>
Cc:     Philipp Zabel <p.zabel@...gutronix.de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Adrian Ratiu <adrian.ratiu@...labora.com>,
        Lucas Stach <l.stach@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        linux-media <linux-media@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [BUG REPORT] media: coda: mpeg4 decode corruption on i.MX6qp only

Bonjour Nicolas,

On Wed, Feb 10, 2021 at 11:11 AM Nicolas Dufresne <nicolas@...fresne.ca> wrote:
>
> Are you sure you aren't just running out of CMA ? This is the only things that
> comes to mind at the moment, sorry if it's not that useful.

Thanks for the suggestion! No worries, this is such a strange/weird
problem, that basically any idea has merit at this point.

I tried increasing the CMA area from 256M -> 512M, but there was no
impact. The critical framebuffer width still remains the same
(=0x900).

And everything works fine on a classic i.MX6Quad, it's only the
i.MX6QuadPlus that has the problem. I am running i.MX6Quad and
i.MX6QuadPlus side-by-side with identical kernels/rootfses. Obviously
the devicetree is slightly different.

Sven