linux-kernel - Re: [PATCH 1/2] thermal: cooling: Check Energy Model type in cpufreq_cooling and devfreq

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Message-ID: <1812eadf-7924-5abd-857b-22b7dfdf8f7d@linaro.org>
Date:   Thu, 17 Feb 2022 13:33:00 +0100
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Lukasz Luba <lukasz.luba@....com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        amit daniel kachhap <amit.kachhap@...il.com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Amit Kucheria <amitk@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Pierre.Gondois@....com, Stephen Boyd <swboyd@...omium.org>,
        Rajendra Nayak <rnayak@...eaurora.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Doug Anderson <dianders@...omium.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        Vincent Guittot <vincent.guittot@...aro.org>
Subject: Re: [PATCH 1/2] thermal: cooling: Check Energy Model type in
 cpufreq_cooling and devfreq_cooling

On 17/02/2022 13:11, Lukasz Luba wrote:

[ ... ]

>> Why not make it more generic and replace the frequency by a 
>> performance index, so it can be used by any kind of perf limiter?
> 
> For that DT array, yes, it can be an index, so effectively it could be
> a simple 1d array.
> 
> something like:
> 
> msm_gpu_energy_model: msm-gpu-energy-model {
>      compatible = "energy-model"
>      /* Values are sorted micro-Watts which correspond to each OPP
>         or performance state. The total amount of them must match
>         number of OPPs. */
>      power-microwatt = <100000>,
>              <230000>,
>              <380000>,
>              <600000>;
> };
> 
> then in gpu node instead of having 'dynamic-power-coefficient',
> which is useless because voltage is missing, we would have
> 'energy-model', like:
> 
>      energy-model = <&msm_gpu_energy_model>;
> 
> 
> If you agree to continue this topic. I will send an RFC so we could
> further discuss this idea. This $subject doesn't fit well.

Yes, definitively I agree to continue on this topic.


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