linux-kernel - Re: [PATCH v3 4/9] media: venus: vdec: add video decoder files

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Date:   Wed, 23 Nov 2016 15:24:42 -0500
From:   Nicolas Dufresne <nicolas@...fresne.ca>
To:     Stanimir Varbanov <stanimir.varbanov@...aro.org>,
        Hans Verkuil <hverkuil@...all.nl>,
        Mauro Carvalho Chehab <mchehab@...nel.org>
Cc:     Andy Gross <andy.gross@...aro.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v3 4/9] media: venus: vdec: add video decoder files

Le lundi 21 novembre 2016 à 18:09 +0200, Stanimir Varbanov a écrit :
> >> Meanwhile I have found bigger obstacle - I cannot run multiple
> instances
> >> simultaneously. By m2m design it can execute only one job (m2m
> context)
> >> at a time per m2m device. Can you confirm that my observation is
> correct?
> > 
> > The m2m framework assumes a single HW instance, yes. Do you have
> multiple
> > HW decoders? I might not understand what you mean...
> > 
> 
> I mean that I can start and execute up to 16 decoder sessions
> simultaneously. Its a firmware responsibility how those sessions are
> scheduled and how the hardware is shared between them. Of course
> depending on the resolution the firmware can refuse to start the
> session
> because the hardware will be overloaded and will not be able to
> satisfy
> the bitrate requirements.

This is similar to S5P-MFC driver, which you may have notice not use
m2m framework.

Nicolas
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