linux-kernel - Re: [PATCH v2 2/5] media: venus: add a routine to set venus state

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Message-ID: <CAAFQd5BvTNhafus4WcoPLiBTN8X3Ls+YA0OgpfnyadDayvVQxA@mail.gmail.com>
Date:   Wed, 4 Jul 2018 18:00:59 +0900
From:   Tomasz Figa <tfiga@...omium.org>
To:     vgarodia@...eaurora.org
Cc:     Hans Verkuil <hverkuil@...all.nl>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Andy Gross <andy.gross@...aro.org>, bjorn.andersson@...aro.org,
        Stanimir Varbanov <stanimir.varbanov@...aro.org>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        linux-soc@...r.kernel.org, devicetree@...r.kernel.org,
        Alexandre Courbot <acourbot@...omium.org>
Subject: Re: [PATCH v2 2/5] media: venus: add a routine to set venus state

On Wed, Jul 4, 2018 at 4:59 PM Vikash Garodia <vgarodia@...eaurora.org> wrote:
> On 2018-06-04 18:24, Tomasz Figa wrote:
> > On Sat, Jun 2, 2018 at 6:21 AM Jordan Crouse <jcrouse@...eaurora.org>
> > wrote:
> >> On Sat, Jun 02, 2018 at 01:56:05AM +0530, Vikash Garodia wrote:
> > Given that this function is supposed to substitute existing calls into
> > qcom_scm_set_remote_state(), why not just do something like this:
> >
> >         if (qcom_scm_is_available())
> >                 return qcom_scm_set_remote_state(state, 0);
> >
> >         switch (state) {
> >         case TZBSP_VIDEO_SUSPEND:
> >                 writel_relaxed(1, reg_base + WRAPPER_A9SS_SW_RESET);
> >                 break;
> >         case TZBSP_VIDEO_RESUME:
> >                 venus_reset_hw(core);
> >                 break;
> >         }
> >
> >         return 0;
> This will not work as driver will write on the register irrespective of
> scm
> availability.

I'm sorry, where would it do so? The second line returns from the
function inf SCM is available, so the rest of the function wouldn't be
executed.

Best regards,
Tomasz