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

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Message-ID: <201008241811.22991.stephan.diestelhorst@amd.com>
Date:	Tue, 24 Aug 2010 18:11:22 +0200
From:	Stephan Diestelhorst <stephan.diestelhorst@....com>
To:	Tejun Heo <htejun@...il.com>
CC:	"Rafael J. Wysocki" <rjw@...k.pl>,
	"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>
Subject: Re: [PATCH] SATA / AHCI: Do not play with the link PM during suspend to RAM

On Tuesday 24 August 2010 18:07:23 Stephan Diestelhorst wrote:
> On Monday 23 August 2010 14:03:40 Tejun Heo wrote:
> > 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.
> 
> Did that. Actually also added some printks to the XXX function, called

I meant ahci_dev_config() in libahci.c . Darn quick trigger finger ;-)

> early during boot. Output confirms that your patch is loaded. And even
> on the first resume the machine dies.
> 
> > * 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.
> 
> That next on my list...
> 
> Many thanks!
> 
> Stephan
> 
> 


-- 
Stephan Diestelhorst, AMD Operating System Research Center
stephan.diestelhorst@....com, Tel. +49 (0)351 448 356 719

Advanced Micro Devices GmbH Einsteinring 24 85609 Dornach
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