linux-kernel - Re: [PATCH v2 4/4] PM: domains: Drop/restore performance state votes for devices at system PM

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Message-ID: <20210603111529.GB4257@sirena.org.uk>
Date:   Thu, 3 Jun 2021 12:15:29 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Ulf Hansson <ulf.hansson@...aro.org>
Cc:     "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        Dmitry Osipenko <digetx@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Roja Rani Yarubandi <rojay@...eaurora.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Stephan Gerhold <stephan@...hold.net>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Rajendra Nayak <rnayak@...eaurora.org>
Subject: Re: [PATCH v2 4/4] PM: domains: Drop/restore performance state votes
 for devices at system PM

On Thu, Jun 03, 2021 at 12:20:57PM +0200, Ulf Hansson wrote:
> On Thu, 3 Jun 2021 at 11:34, Ulf Hansson <ulf.hansson@...aro.org> wrote:

> > Recent changes in genpd drops and restore performance state votes for
> > devices during runtime PM.

> After a second thought, it looks like we maybe should defer to apply
> this final patch of the series. At least until we figured out how to
> address the below issue:

> So, I noticed that we have things like "regulator-fixed-domain", that
> uses "required-opps" to enable/disable a regulator through the
> dev_pm_set_performance_state() interface. We likely don't want to drop
> the performance state internally in genpd when genpd_suspend_noirq()
> gets called, for the corresponding struct device for the regulator.

> I guess if genpd should drop performance states like $subject patch
> suggest, we need some kind of additional coordination, that allows a
> subsystem/driver to inform genpd when it should avoid it. Or something
> along those lines.

I'm not sure what you're looking for from me here - was there a concrete
question or somehing?

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