linux-kernel - Re: [PATCH] cpufreq: suspend/resume governors with PM notifiers

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Message-ID: <5286F536.70403@linaro.org>
Date:	Sat, 16 Nov 2013 10:01:50 +0530
From:	viresh kumar <viresh.kumar@...aro.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
CC:	linaro-kernel@...ts.linaro.org, patches@...aro.org,
	cpufreq@...r.kernel.org, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org, tianyu.lan@...el.com, nm@...com,
	jinchoi@...adcom.com, sebastian.capella@...aro.org
Subject: Re: [PATCH] cpufreq: suspend/resume governors with PM notifiers

On Saturday 16 November 2013 05:54 AM, Rafael J. Wysocki wrote:
> Will cpufreq work during system-wide power transitions (suspend/resume etc.)
> after this?  In particular, what about hibernation?

I am disabling governors as soon as we start suspend. So No, cpufreq wouldn't
work during suspend/resume. But once system is resumed we are starting it back
again.

Hibernation is probably not supported by my code yet.. I just went through
hibernation code quickly and it looks we don't send PM_SUSPEND_PREPARE or
PM_POST_SUSPEND notifications in case of hibernation. Correct?

And these are the notifications that we send:
- PM_HIBERNATION_PREPARE
- PM_POST_HIBERNATION
- PM_RESTORE_PREPARE
- PM_POST_RESTORE

If I am not wrong I need to stop governors on PM_HIBERNATION_PREPARE and need to
start them back on: PM_POST_HIBERNATION (I am a bit confused with this one. Does
this POST_HIBERNATION one happens at the end of going into hibernation? or after
booting back? I need a notifier at the end of restore)..

--
viresh
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