linux-kernel - Re: [PATCH v5 3/5] thermal: devfreq_cooling: Use PM QoS to set frequency limits

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Message-ID: <20200403171818.GO199755@google.com>
Date:   Fri, 3 Apr 2020 10:18:18 -0700
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:     Lukasz Luba <lukasz.luba@....com>, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        dri-devel@...ts.freedesktop.org, linux-omap@...r.kernel.org,
        linux-mediatek@...ts.infradead.org, linux-arm-msm@...r.kernel.org,
        linux-imx@....com, Morten.Rasmussen@....com,
        Dietmar.Eggemann@....com, javi.merino@....com,
        cw00.choi@...sung.com, b.zolnierkie@...sung.com, rjw@...ysocki.net,
        sudeep.holla@....com, viresh.kumar@...aro.org, nm@...com,
        sboyd@...nel.org, rui.zhang@...el.com, amit.kucheria@...durent.com,
        mingo@...hat.com, peterz@...radead.org, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, rostedt@...dmis.org,
        qperret@...gle.com, bsegall@...gle.com, mgorman@...e.de,
        shawnguo@...nel.org, s.hauer@...gutronix.de, festevam@...il.com,
        kernel@...gutronix.de, khilman@...nel.org, agross@...nel.org,
        bjorn.andersson@...aro.org, robh@...nel.org,
        matthias.bgg@...il.com, steven.price@....com,
        tomeu.vizoso@...labora.com, alyssa.rosenzweig@...labora.com,
        airlied@...ux.ie, daniel@...ll.ch, liviu.dudau@....com,
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        orjan.eide@....com, rdunlap@...radead.org
Subject: Re: [PATCH v5 3/5] thermal: devfreq_cooling: Use PM QoS to set
 frequency limits

Hi Daniel,

On Fri, Apr 03, 2020 at 06:43:20PM +0200, Daniel Lezcano wrote:
> On 18/03/2020 12:45, Lukasz Luba wrote:
> > From: Matthias Kaehlcke <mka@...omium.org>
> > 
> > Now that devfreq supports limiting the frequency range of a device
> > through PM QoS make use of it instead of disabling OPPs that should
> > not be used.
> > 
> > The switch from disabling OPPs to PM QoS introduces a subtle behavioral
> > change in case of conflicting requests (min > max): PM QoS gives
> > precedence to the MIN_FREQUENCY request, while higher OPPs disabled
> > with dev_pm_opp_disable() would override MIN_FREQUENCY.
> > 
> > Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
> > Reviewed-by: Lukasz Luba <lukasz.luba@....com>
> > Reviewed-by: Chanwoo Choi <cw00.choi@...sung.com>
> 
> This patch is standalone, right? If yes, I will apply it.

Yes, it is standalone, please apply

Thanks

Matthias