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

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Message-ID: <1455643.Gytp1zkkCW@vostro.rjw.lan>
Date:	Tue, 18 Feb 2014 23:36:16 +0100
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Stephen Warren <swarren@...dotorg.org>
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 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?

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

-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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