linux-kernel - Re: [PATCH 1/2] cpufreq: try to resume policies which failed on last resume

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Date:	Fri, 03 Jan 2014 10:53:34 +0100
From:	Bjørn Mork <bjorn@...k.no>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	cpufreq@...r.kernel.org, Viresh Kumar <viresh.kumar@...aro.org>,
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] cpufreq: try to resume policies which failed on last resume

Bjørn Mork <bjorn@...k.no> writes:
> "Rafael J. Wysocki" <rjw@...ysocki.net> writes:
>
>> OK, thanks!  Well, this is somewhat worrisome.
>>
>> Could you also check the linux-pm.git/fixes branch that contains all patches
>> I'm planning to push for 3.13-rc7 shortly?
>
> It's definitely still there.  But I'm less sure about the exact trigger.

I did a couple of more tests after clean reboots, and 100% sure ways to
trigger the circular locking on my laptop are

  echo ondemand > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
  s2disk

or

  echo 1401000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq 
  s2disk

or

  echo 1401000 > /sys/devices/system/cpu/cpu1/cpufreq/scaling_max_freq 
  s2disk


Note that "ondemand" and "1401000" are the default vaules, so I don't
actually change anything here.  The write is causing the problem, not
the value.  As expected, I guess.

Also note that boot vs non-boot cpu doesn't seem to matter.  Nor does
cancelling the hibernation.  The warning appears on hibernate - not on
resume.

Hope this helps.


Bjørn
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