linux-kernel - Re: PM: after suspend/resume the system,can not suspends again

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Message-ID: <564A847C.1090406@jinso.co.jp>
Date:	Tue, 17 Nov 2015 10:35:56 +0900
From:	Cao Minh Hiep <cm-hiep@...so.co.jp>
To:	Ulf Hansson <ulf.hansson@...aro.org>
CC:	Nguyen Viet Dung <nv-dung@...so.co.jp>,
	Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
	Linux-SH <linux-sh@...r.kernel.org>,
	Linux-Kernel <linux-kernel@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Sakato Ryusuke <ryusuke.sakato.bx@...esas.com>
Subject: Re: PM: after suspend/resume the system,can not suspends again

Dear Ulf Hansson
Thanks for your feedback!

On 2015年11月17日 06:12, Ulf Hansson wrote:
> On 16 November 2015 at 10:13, Cao Minh Hiep <cm-hiep@...so.co.jp> wrote:
>> Dear Ulf Hansson,
>>
>> I am Hiep from Jinzai Solution (a Japanese Company)
>> We have tested PM driver on Rcar-Gen2 (Lager, Koelsch Board) at Linux v4.3.
>>
>> I would like to contact you because we found a patch that relate to a PM bug
>> :
>>
>> After Suspend/resume system one time, we can not suspend the system again!.
>> (I attach the test log file)
>>
>> The patch is show as below:
>> a98f1b7 PM / Domains: Fix validation of latency constraints in genpd
>> governor
>>
>> Tested-by: Harunaga <nx-truong@...so.co.jp>
>> Reported-by: Cao Minh Hiep <cm-hiep@...so.co.jp>
>>
>> This problem disapeared if revert this patch.
>> Please review it, when you have time!
> Thanks for reporting and bisecting!
>
> I had a look and I believe have found the cause of the problem, though
> I will need a few days to post a fix for it.
>
> The problem is actually in genpd's ->runtime_suspend() callback, as it
> validates PM QoS latencies even when it's being invoked from the
> system PM path.
> I will post a fixup to genpd in the next couple of days. I would
> appreciate if you could help out in testing it.
Please let me know when you post the fixup. I will test it.


Thank you!
Jinso/Cao Minh Hiep.

> Kind regards
> Uffe
>

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