linux-kernel - Re: [PATCH V2 2/2] cpufreq: Change freq before suspending governors

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Message-ID: <CAKohpomEL8aU_ETaHFG_G8mhYMZc6M6x7i4m+McozP=i7Fzz5A@mail.gmail.com>
Date:	Mon, 25 Nov 2013 09:58:29 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	Stephen Warren <swarren@...dotorg.org>,
	Stephen Warren <swarren@...dia.com>,
	Kukjin Kim <kgene@...nel.org>,
	Amit Daniel Kachhap <amit.daniel@...sung.com>,
	Sachin Kamat <sachin.kamat@...aro.org>,
	Lists linaro-kernel <linaro-kernel@...ts.linaro.org>,
	Patch Tracking <patches@...aro.org>,
	"cpufreq@...r.kernel.org" <cpufreq@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Lan Tianyu <tianyu.lan@...el.com>, Nishanth Menon <nm@...com>,
	jinchoi@...adcom.com,
	Sebastian Capella <sebastian.capella@...aro.org>,
	Peter De Schrijver <pdeschrijver@...dia.com>
Subject: Re: [PATCH V2 2/2] cpufreq: Change freq before suspending governors

On 25 November 2013 03:02, Rafael J. Wysocki <rjw@...ysocki.net> wrote:
> Viresh, maybe make it possible for the cpufreq driver to provide suspend/resume
> callbacks to be executed by cpufreq_suspend() and cpufreq_resume() introduced
> by [1/2]?  Then Tegra could set the frequencies to what it wants from there
> before the governors are stopped.

Giving cpufreq-drivers a chance to do whatever they want looks to be
correct. So, maybe prepare() or suspend_prepare() for them can be
implemented.

Though I would still go for a generic function in core, which can be
just  reused by samsung and tegra to set cores to specific frequencies.

--
viresh
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