linux-kernel - Re: [PATCH 0/4] Add sustainable OPP concept

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Date:   Thu, 29 Oct 2020 13:10:57 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Lukasz Luba <lukasz.luba@....com>, vincent.guittot@...aro.org
Cc:     linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        vireshk@...nel.org, robh+dt@...nel.org, sboyd@...nel.org,
        nm@...com, rafael@...nel.org, sudeep.holla@....com,
        daniel.lezcano@...aro.org, Dietmar.Eggemann@....com
Subject: Re: [PATCH 0/4] Add sustainable OPP concept

On 28-10-20, 14:08, Lukasz Luba wrote:
> Hi all,
> 
> This patch set introduces a concept of sustainable OPP, which then can be used
> by kernel frameworks or governors for estimating system sustainable system
> state. This kind of estimation is done e.g. in thermal governor Intelligent
> Power Allocation (IPA), which calculates sustainable power of the whole system
> and then derives some coefficients for internal algorithm.
> 
> The patch set introduces a new DT bindings 'opp-sustainable', with parsing
> code. It also adds a function (in patch 3/4) which allows device drivers to set
> directly the sustainable OPP. This is helpful when the device drivers populate
> the OPP table by themself (example in patch 4/4).
> 

Can we please have some more information about this ? What does the
sustainable OPP mean ? How will platform guys know or learn about this
? How we are going to use it finally ? What does it have to do with
temperature of the SoC or the thermal affects, etc.

-- 
viresh