linux-kernel - Re: [PATCH V8 1/6] PM / Domains: Add support to select performance-state of domains

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Message-ID: <20170731041424.GA5804@vireshk-i7>
Date:   Mon, 31 Jul 2017 09:44:24 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Ulf Hansson <ulf.hansson@...aro.org>
Cc:     Rafael Wysocki <rjw@...ysocki.net>,
        Kevin Hilman <khilman@...nel.org>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Nishanth Menon <nm@...com>, Rob Herring <robh+dt@...nel.org>,
        Lina Iyer <lina.iyer@...aro.org>,
        Rajendra Nayak <rnayak@...eaurora.org>,
        Sudeep Holla <sudeep.holla@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
        Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>
Subject: Re: [PATCH V8 1/6] PM / Domains: Add support to select
 performance-state of domains

On 29-07-17, 10:24, Ulf Hansson wrote:
> Let's invent a new genpd flag, GENPD_FLAG_PERF_STATE!
> 
> The creator of the genpd then needs to set this before calling
> pm_genpd_init(). Similar as we are dealing with GENPD_FLAG_PM_CLK.
> 
> The requirement for GENPD_FLAG_PERF_STATES, is to have the
> ->get_performance_state() assigned. This shall be verified during
> pm_genpd_init().
> 
> The pm_genpd_has_performance_state() then only need to return true, in
> cases the device's genpd has GENPD_FLAG_PERF_STATE set - else false.
> 
> Regarding ->set_performance_state(), let's just make it optional - and
> when trying to set a new performance state, just walk the genpd
> hierarchy, from bottom to up, then invoke the callback when it's
> assigned.

Sounds good.

-- 
viresh