linux-kernel - Re: [PATCH v7 2/3] PM / Domains: Add support for 'required-opps' to set default perf state

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Date:   Mon, 16 Aug 2021 18:47:32 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Ulf Hansson <ulf.hansson@...aro.org>,
        Rajendra Nayak <rnayak@...eaurora.org>
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        DTML <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Roja Rani Yarubandi <rojay@...eaurora.org>,
        Stephan Gerhold <stephan@...hold.net>,
        Dmitry Osipenko <digetx@...il.com>
Subject: Re: [PATCH v7 2/3] PM / Domains: Add support for 'required-opps' to
 set default perf state

On Thu, Aug 12, 2021 at 1:46 PM Ulf Hansson <ulf.hansson@...aro.org> wrote:
>
> On Thu, 12 Aug 2021 at 13:28, Rajendra Nayak <rnayak@...eaurora.org> wrote:
> >
> > Some devices within power domains with performance states do not
> > support DVFS, but still need to vote on a default/static state
> > while they are active. They can express this using the 'required-opps'
> > property in device tree, which points to the phandle of the OPP
> > supported by the corresponding power-domains.
> >
> > Add support to parse this information from DT and then set the
> > specified performance state during attach and drop it on detach.
> > runtime suspend/resume callbacks already have logic to drop/set
> > the vote as needed and should take care of dropping the default
> > perf state vote on runtime suspend and restore it back on runtime
> > resume.
> >
> > Signed-off-by: Rajendra Nayak <rnayak@...eaurora.org>
>
> Reviewed-by: Ulf Hansson <ulf.hansson@...aro.org>

All three patches applied as 5.15 material, thanks!