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

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Message-ID: <201008191823.57915.stephan.diestelhorst@amd.com>
Date:	Thu, 19 Aug 2010 18:23:57 +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>,
	Stephan Diestelhorst <stephan.diestelhorst@...il.com>
Subject: Re: [PATCH] SATA / AHCI: Do not play with the link PM during suspend to RAM

Hi Tejun,

On Wednesday 18 August 2010, 08:12:24 Tejun Heo wrote:
> On 08/17/2010 11:28 PM, Stephan Diestelhorst wrote:
> > 2010/8/17 Tejun Heo <htejun@...il.com>:
> >> On 08/17/2010 12:51 PM, Stephan Diestelhorst wrote:
> >>> I've also confirmed that the "XXX ahci_set_ipm" is present in
> >>> libahci.ko. So either I've screwed up badly when compiling the initrd,
> >>> the code is not executed or the printout does not make it into any
> >>> logfile anymore.
> >>
> >> Yeah, that's weird.  You're enabling IPM, right?
>
> You can check whether it's enabled by
> 
> $ cat /sys/class/scsi_host/host0/link_power_management_policy
> 
> If it says max_performance, it's disabled.  If it says anything else,
> it's enabled.

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?

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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