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

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Message-ID: <d73ce772-8d0a-e5f4-097a-d89e01ff7578@linaro.org>
Date:   Fri, 3 Apr 2020 18:43:20 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     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
Cc:     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,
        lorenzo.pieralisi@....com, patrick.bellasi@...bug.net,
        orjan.eide@....com, rdunlap@...radead.org, mka@...omium.org
Subject: Re: [PATCH v5 3/5] thermal: devfreq_cooling: Use PM QoS to set
 frequency limits

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.



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