linux-kernel - Re: [PATCH V6 0/7] cpufreq: suspend early/resume late: dpm

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Date:	Tue, 18 Feb 2014 13:30:52 -0700
From:	Stephen Warren <swarren@...dotorg.org>
To:	Viresh Kumar <viresh.kumar@...aro.org>, rjw@...ysocki.net
CC:	linaro-kernel@...ts.linaro.org, cpufreq@...r.kernel.org,
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org, nm@...com,
	kgene.kim@...sung.com, jinchoi@...adcom.com, tianyu.lan@...el.com,
	sebastian.capella@...aro.org, jhbird.choi@...sung.com
Subject: Re: [PATCH V6 0/7] cpufreq: suspend early/resume late: dpm_{suspend|resume}()

On 02/17/2014 02:25 AM, Viresh Kumar wrote:
> This patchset creates/calls cpufreq suspend/resume callbacks from dpm_{suspend|resume}()
> for handling suspend/resume of cpufreq governors and core.
> 
> There are multiple problems that are fixed by this patch:
> - Nishanth Menon (TI) found an interesting problem on his platform, OMAP. His board
>   wasn't working well with suspend/resume as calls for removing non-boot CPUs
>   was turning out into a call to drivers ->target() which then tries to play
>   with regulators. But regulators and their I2C bus were already suspended and
>   this resulted in a failure. Many platforms have such problems, samsung, tegra,
>   etc.. They solved it with driver specific PM notifiers where they used to
>   disable their driver's ->target() routine.
> - Lan Tianyu (Intel) & Jinhyuk Choi (Broadcom) found an issue where tunables
>   configuration for clusters/sockets with non-boot CPUs was getting lost after
>   suspend/resume, as we were notifying governors with CPUFREQ_GOV_POLICY_EXIT on
>   removal of the last cpu for that policy and so deallocating memory for
>   tunables.  This is fixed by this patch as we don't allow any operation on
>   governors after device suspend and before device resume now.

The series,
Tested-by: Stephen Warren <swarren@...dia.com>

Patch 7/7,
Acked-by: Stephen Warren <swarren@...dia.com>

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