linux-kernel - Re: [PATCH V5 0/7] cpufreq: suspend early/resume late: dpm

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Message-ID: <CAKohpo=7Kbvh5UN9iZ6V3e=1ZY6y5_grQjxj6raEL_djHnMZrQ@mail.gmail.com>
Date:	Mon, 17 Feb 2014 11:38:53 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Stephen Warren <swarren@...dotorg.org>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	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>, Kgene Kim <kgene.kim@...sung.com>,
	jinchoi@...adcom.com, Lan Tianyu <tianyu.lan@...el.com>,
	Sebastian Capella <sebastian.capella@...aro.org>,
	Jonghwan Choi <jhbird.choi@...sung.com>
Subject: Re: [PATCH V5 0/7] cpufreq: suspend early/resume late: dpm_{suspend|resume}()

On 15 February 2014 01:12, Stephen Warren <swarren@...dotorg.org> wrote:
> On 02/12/2014 11:50 PM, Viresh Kumar wrote:
>> This patchset creates/calls cpufreq suspend/resume callbacks from dpm_{suspend|resume}()
>> for handling suspend/resume of cpufreq governors and core.
>
> Are these patches for 3.14 or 3.15?

3.15

> I ask because I just tested Linus's master from a few days back (some
> point after v3.14-rc2; commit 9398a10cd964 Merge tag
> 'regulator-v3.14-rc2'), and I see a lot of the following messages during
> suspend and/or resume (about 2-7 times, perhaps more of them from the
> resume path, but it's hard to tell):
>
> cpufreq: __cpufreq_driver_target: Failed to change cpu frequency: -16

That's because you return -EBUSY from your tegra_cpu_init() once
suspend/resume has started. Probably the print message is new here,
and so you are able to see it failing.. Nothing else should have changed
otherwise.

> This series does appear to solve those, so I think at least part of it
> needs to be applied for 3.14.

Because we disallow calls to __cpufreq_driver_target() after suspend/
resume have started.

> Also, I sometimes see the following during resume. I saw it twice with
> Linus's tree, but then I did 10 more reboot+suspend+resume cycles and
> couldn't repro it, and I saw it once with Linus's tree plus this series
> applied, then couldn't reproduce it in 5 more tries.

> Do you have any idea what the problem might be, and how to solve it?

Not yet, will check..
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