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

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Date:   Wed, 04 Jul 2018 15:11:49 +0530
From:   Vikash Garodia <vgarodia@...eaurora.org>
To:     Tomasz Figa <tfiga@...omium.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>,
        linux-media-owner@...r.kernel.org
Subject: Re: [PATCH v2 2/5] media: venus: add a routine to set venus state

On 2018-07-04 14:30, Tomasz Figa wrote:
> 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.

Ah!! you are right. That would work as well.
I am ok with either way, but would recommend to keep it the existing way
as it makes it little more readable.

> Best regards,
> Tomasz