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

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Date:   Tue, 7 Feb 2023 10:17:39 +0100
From:   Michał Krawczyk <mk@...ihalf.com>
To:     Stanimir Varbanov <stanimir.k.varbanov@...il.com>,
        Vikash Garodia <quic_vgarodia@...cinc.com>
Cc:     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-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, mw@...ihalf.com
Subject: Re: [PATCH v2] media: venus: dec: Fix handling of the start cmd

pon., 30 sty 2023 o 14:55 Michał Krawczyk <mk@...ihalf.com> napisał(a):
>
> From: Michał Krawczyk <mk@...ihalf.com>
>
> The decoder driver should clear the last_buffer_dequeued flag of the
> capture queue upon receiving V4L2_DEC_CMD_START.
>
> The last_buffer_dequeued flag is set upon receiving EOS (which always
> happens upon receiving V4L2_DEC_CMD_STOP).
>
> Without this patch, after issuing the V4L2_DEC_CMD_STOP and
> V4L2_DEC_CMD_START, the vb2_dqbuf() function will always fail, even if
> the buffers are completed by the hardware.
>
> Fixes: beac82904a87 ("media: venus: make decoder compliant with stateful codec API")
>
> Signed-off-by: Michał Krawczyk <mk@...ihalf.com>

Hello,

Did anyone have a chance to take a look at this patch? It's fairly
simple, but lack of this fix can have a big impact on the V4L2
applications which implement the flush mechanism using the stop/start
commands, especially in the middle of the video.

Thank you,
Michał