linux-kernel - Re: [PATCH v2 0/3] EM / PM: Inefficient OPPs

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Message-ID: <20210526093318.cbtjkybzwdchxi5y@vireshk-i7>
Date:   Wed, 26 May 2021 15:03:18 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Lukasz Luba <lukasz.luba@....com>
Cc:     Vincent Donnefort <vincent.donnefort@....com>,
        peterz@...radead.org, rjw@...ysocki.net,
        vincent.guittot@...aro.org, qperret@...gle.com,
        linux-kernel@...r.kernel.org, ionela.voinescu@....com,
        dietmar.eggemann@....com
Subject: Re: [PATCH v2 0/3] EM / PM: Inefficient OPPs

On 26-05-21, 09:56, Lukasz Luba wrote:
> No, these OPPs have to stay because they are used in thermal for cooling
> states.

This won't break the thermal tables. Thermal just sets the max-freq for a CPU,
and it doesn't depend on the OPP table for that.

> DT cooling devices might have them set as a scope of possible
> states. We don't want to break existing platforms, don't we?

I don't think we will end up breaking anything here.

> We want to 'avoid' those OPPs when possible (no thermal pressure), but
> we might have to use them sometimes.

Why would we want to use them if they are inefficient ? Thermal or something
else as well ?

More in the other reply I am sending to Vincent.

-- 
viresh