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

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Date:	Tue, 18 Feb 2014 15:26:01 -0700
From:	Stephen Warren <swarren@...dotorg.org>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
CC:	Viresh Kumar <viresh.kumar@...aro.org>,
	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 02/18/2014 03:36 PM, Rafael J. Wysocki wrote:
> On Tuesday, February 18, 2014 01:30:52 PM Stephen Warren wrote:
>> 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>
> 
> Is this series necessary to fix bugs that you're seeing in 3.14-rc and if so,
> the what bugs are they?

No, Viresh sent a separate patch that fixed the sysfs warning I was
getting (I believe you've already applied that), and there's still some
ongoing discussion about the other kernel spew.

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