linux-kernel - Re: [PATCH] SATA / AHCI: Do not play with the link PM during suspend to RAM

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Date:	Tue, 24 Aug 2010 09:37:34 +0200
From:	Tejun Heo <htejun@...il.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
CC:	Stephan Diestelhorst <stephan.diestelhorst@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-ide@...r.kernel.org" <linux-ide@...r.kernel.org>,
	"linux-pm@...ts.osdl.org" <linux-pm@...ts.osdl.org>,
	Stephan Diestelhorst <stephan.diestelhorst@...il.com>
Subject: Re: [PATCH] SATA / AHCI: Do not play with the link PM during suspend
 to RAM

On 08/23/2010 08:58 PM, Rafael J. Wysocki wrote:
> On Monday, August 23, 2010, Tejun Heo wrote:
>> Hello, sorry about the delay.
>>
>> On 08/19/2010 06:23 PM, Stephan Diestelhorst wrote:
>>> It says "max_performance", I have not touched anyhting. So it has been
>>> like that all the time. Would this explain why your patch did not show
>>> the debug printout?
>>
>> Hmm... okay.  Yeah, if you haven't been using IPM at all, there won't
>> be any debug messages but at the same time the posted patch should
>> have had the same effect as Rafael's patch as IPM path isn't traveled
>> at all.  Can you please check the followings?
>>
>> * You're actually running the correct patched kernel and modules.  It
>>   probably is a good idea to add a printk message.  ie. Apply the
>>   patch and add a printk() in ata_host_request_pm() in libata-core.c
>>   and make sure the debug messages appears.
>>
>> * Rafael's patch actually fixes the problem.  If you haven't been
>>   using IPM at all, Rafael's patch and mine should behave exactly the
>>   same (ie. no IPM operation at all during suspend/resume).  It could
>>   be that you're seeing a different issue.
>>
>> Rafael, can you please test my patch and see how your case behaves?
> 
> This one: http://lkml.org/lkml/2010/8/5/328 ?

Yeap, that one.  I can prep a test git branch if necessary.

Thanks.

-- 
tejun
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