linux-kernel - Re: [PATCH v2] media: venus: dec: Fix handling of the start cmd

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Date:   Tue, 7 Feb 2023 12:15:48 +0100
From:   Michał Krawczyk <mk@...ihalf.com>
To:     Vikash Garodia <vgarodia@....qualcomm.com>
Cc:     Stanimir Varbanov <stanimir.k.varbanov@...il.com>,
        "Vikash Garodia (QUIC)" <quic_vgarodia@...cinc.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        "linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "mw@...ihalf.com" <mw@...ihalf.com>
Subject: Re: [PATCH v2] media: venus: dec: Fix handling of the start cmd

wt., 7 lut 2023 o 10:54 Vikash Garodia <vgarodia@....qualcomm.com> napisał(a):
> I have reviewed the patch, and the drain sequence handling looks good to me.
> Could you share some details on the test client which you are using to catch this issue ?

Hi Vikash,

Thank you for looking at the code!

I've been testing it using the Chromium implementation of the V4L2
codec [1]. Meanwhile, we were running a test suite which changes the
encryption method in the middle of the video decoding. This triggers
the flush behavior and the Chromium sends the stop/start cmd to the
V4L2 kernel component, and the test expects the video to continue the
playback normally. Unfortunately, it was causing a stall of the video
at the same time.

[1] https://source.chromium.org/chromium/chromium/src/+/main:media/gpu/v4l2/

>
> > Thank you,
> > Michał
>
> Thanks,
> Vikash