linux-kernel - Re: [PATCH v4 0/5] Register an Energy Model for Arm reference platforms

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Date:   Tue, 5 Feb 2019 10:25:13 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Quentin Perret <quentin.perret@....com>
Cc:     sudeep.holla@....com, rjw@...ysocki.net, nm@...com,
        sboyd@...nel.org, mka@...omium.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        dietmar.eggemann@....com
Subject: Re: [PATCH v4 0/5] Register an Energy Model for Arm reference
 platforms

On 04-02-19, 11:09, Quentin Perret wrote:
> The Energy Model (EM) framework feeds interested subsystems (the
> scheduler/EAS as of now) with power costs provided by drivers. Yet, no
> driver is actually doing that upstream yet. This series updates a set of
> CPUFreq drivers in order to register power costs in the EM framework for
> some of the Arm reference platforms for EAS: Hikey960, Juno and TC2.
> 
> The series is split as follows:
>  - Patch 01 introduces in PM_OPP a helper function which estimates the
>    CPU power using the P=CV²f equation also used by IPA. It should be
>    noted that this introduces duplicate code with IPA, which will
>    eventually be fixed by migrating IPA to using PM_EM. The ideal plan
>    would be to do so later, in a separate patch series. I would indeed
>    prefer to keep the thermal and CPUFreq discussion separate at this
>    stage, if deemed acceptable.
>  - Patches 02-04 make use of that PM_OPP helper function from the
>    following CPUFreq drivers: cpufreq-dt, scpi-cpufreq and
>    arm_big_little.
>  - Patch 05 modifies the SCMI cpufreq driver to pass the power costs
>    obtained from firmware to PM_EM. This patch is independent from the
>    rest of the series.
> 
> 
> Changes since v3 (20190201093101.31869-1-quentin.perret@....com)
>  - Moved the OPP count inside dev_pm_opp_of_register_em() (Matthias,
>    Sudeep)

Applied. Thanks.

-- 
viresh