linux-kernel - Re: [PATCH 2/2] cpufreq: mediatek: Register an Energy Model

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Message-ID: <20190206181659.GI117604@google.com>
Date:   Wed, 6 Feb 2019 10:16:59 -0800
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Quentin Perret <quentin.perret@....com>
Cc:     "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        Taniya Das <tdas@...eaurora.org>, CK Hu <ck.hu@...iatek.com>,
        Eddie Huang <eddie.huang@...iatek.com>,
        Nicolas Boichat <drinkcat@...omium.org>,
        Douglas Anderson <dianders@...omium.org>
Subject: Re: [PATCH 2/2] cpufreq: mediatek: Register an Energy Model

Hi Quentin,

On Wed, Feb 06, 2019 at 10:13:18AM +0000, Quentin Perret wrote:
> Hi Matthias,
> 
> On Tuesday 05 Feb 2019 at 09:52:25 (-0800), Matthias Kaehlcke wrote:
> > Try and register an Energy Model from mediatek-cpufreq to allow
> > interested subsystems like the task scheduler to use the provided
> > information.
> > 
> > Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
> > ---
> >  drivers/cpufreq/mediatek-cpufreq.c | 2 ++
> >  1 file changed, 2 insertions(+)
> > 
> > diff --git a/drivers/cpufreq/mediatek-cpufreq.c b/drivers/cpufreq/mediatek-cpufreq.c
> > index eb8920d398181..e6168ee582783 100644
> > --- a/drivers/cpufreq/mediatek-cpufreq.c
> > +++ b/drivers/cpufreq/mediatek-cpufreq.c
> > @@ -460,6 +460,8 @@ static int mtk_cpufreq_init(struct cpufreq_policy *policy)
> >  		return ret;
> >  	}
> >  
> > +	dev_pm_opp_of_register_em(policy->cpus);
> 
> I'm not familiar with the mediatek-cpufreq driver so bear with me, but
> the code sets policy->cpus just below here. Is there any particular
> reason for not using that in PM_EM ?

You are prefectly right, I missed the obvious and didn't get my hands
on hardware yet for testing.

So much for screwing up a one-liner ... I'll send a fix.

I thought Viresh already applied the patch, however in opp/linux-next
I currently only see the other one of this series for qcom-hw, so it
seems sending a new version rather than a fix-up patch is the way to
go.

Thanks for the review!

> >  	cpumask_copy(policy->cpus, &info->cpus);
> >  	policy->freq_table = freq_table;
> >  	policy->driver_data = info;
> 
> Thanks,
> Quentin