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

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Date:	Mon, 18 Nov 2013 21:37:39 +0800
From:	Lan Tianyu <tianyu.lan@...el.com>
To:	Viresh Kumar <viresh.kumar@...aro.org>
CC:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	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>,
	Nishanth Menon <nm@...com>, jinchoi@...adcom.com,
	Sebastian Capella <sebastian.capella@...aro.org>,
	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
Subject: Re: [PATCH] cpufreq: suspend/resume governors with PM notifiers

On 11/18/2013 07:01 PM, Viresh Kumar wrote:
> On 18 November 2013 16:27, Lan Tianyu <tianyu.lan@...el.com> wrote:
>> How about introducing a resume/suspend callback pointer or list(if there
>> are several places that need to deal with cpu resume/suspend) in the
>> struct cpu and populate it in the cpufreq_add_dev()?
>>
>> The suspend/resume() of cpu_subsys needs to check the callback pointer
>> and run it if available.
>
> That's almost a new infrastructure then and looks more hackish :)

The resume/suspend() must be stored in the struct driver->pm? :)

> Apart from that even cpufreq would be a bit hacky as we don't really need
> per-cpu callbacks..
>

This maybe depends on where we want the issue to be fixed, right?
The cpufreq driver also can fix the issue if we run their cpu_driver 
resume/suspend callback earlier.

Another point, I just see cpuidle_resume() and cpuidle_pause() are 
called in the dpm_resume_noirq and dpm_suspend_noirq(). Not sure whether 
this can be applied to cpufreq.

-- 
Best Regards
Tianyu Lan
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