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

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Date:	Mon, 24 Feb 2014 12:14:01 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	Lists linaro-kernel <linaro-kernel@...ts.linaro.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>,
	Stephen Warren <swarren@...dotorg.org>,
	Kgene Kim <kgene.kim@...sung.com>,
	"jinchoi@...adcom.com" <jinchoi@...adcom.com>,
	Lan Tianyu <tianyu.lan@...el.com>,
	Sebastian Capella <sebastian.capella@...aro.org>,
	Jonghwan Choi <jhbird.choi@...sung.com>,
	Viresh Kumar <viresh.kumar@...aro.org>
Subject: Re: [PATCH V6 0/7] cpufreq: suspend early/resume late: dpm_{suspend|resume}()

On 17 February 2014 14:55, Viresh Kumar <viresh.kumar@...aro.org> 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.
>
> This is already tested by few people and so incorporating their Tested-by as
> well.
>
> I have tested this again on latest stuff on my thinkpad for several
> suspend/resume cycles.
>
> V6->V7:
> - Fixed crash reported by S.Warren on systems without a cpufreq driver.
> - Moved some function doc-comments to patch 1 from a later patch.
>
> For-v3.15
>
> Viresh Kumar (7):
>   cpufreq: suspend governors on system suspend/hibernate
>   cpufreq: suspend governors from dpm_{suspend|resume}()
>   cpufreq: call driver's suspend/resume for each policy
>   cpufreq: Implement cpufreq_generic_suspend()
>   cpufreq: exynos: Use cpufreq_generic_suspend()
>   cpufreq: s5pv210: Use cpufreq_generic_suspend()
>   cpufreq: Tegra: Use cpufreq_generic_suspend()
>
>  drivers/base/power/main.c         |   5 ++
>  drivers/cpufreq/cpufreq.c         | 137 +++++++++++++++++++++++---------------
>  drivers/cpufreq/exynos-cpufreq.c  |  96 ++------------------------
>  drivers/cpufreq/s5pv210-cpufreq.c |  49 +-------------
>  drivers/cpufreq/tegra-cpufreq.c   |  46 ++-----------
>  include/linux/cpufreq.h           |  11 +++
>  6 files changed, 113 insertions(+), 231 deletions(-)

Hi Rafael,

I think this patch is good to go now for 3.15?

--
viresh
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