linux-kernel - Re: Regression 3.2 -> 3.3-rc1 10 sec hang at boot and resume, COMRESET failed

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Message-ID: <4F3D2C86.6080701@garzik.org>
Date:	Thu, 16 Feb 2012 11:19:18 -0500
From:	Jeff Garzik <jeff@...zik.org>
To:	Mark Lord <kernel@...savvy.com>
CC:	Tejun Heo <tj@...nel.org>,
	Brian Norris <computersforpeace@...il.com>,
	Lin Ming <ming.m.lin@...el.com>,
	Norbert Preining <preining@...ic.at>,
	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org,
	"stern@...land.harvard.edu >> Alan Stern" <stern@...land.harvard.edu>,
	linux-ide@...r.kernel.org,
	Linux PM mailing list <linux-pm@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Jian Peng <jipeng2005@...il.com>,
	Kevin Cernekee <cernekee@...il.com>, valdis.kletnieks@...edu
Subject: Re: Regression 3.2 -> 3.3-rc1 10 sec hang at boot and resume, COMRESET
 failed

On 02/16/2012 09:20 AM, Mark Lord wrote:
> On 12-02-15 01:31 PM, Tejun Heo wrote:
>> Hey, Jeff.
>>
>> On Wed, Feb 15, 2012 at 01:29:29PM -0500, Jeff Garzik wrote:
>>> A module parameter is not necessarily the best/only option.
>>> ahci_platform already has infrastructure set up to deal with
>>> platform-specific quirks.  An internal flag seems more appropriate
>>> to enable automatic handling of this on the specific platforms where
>>> it applies (plus the revert Tejun has already mentioned).
>>
>> The problem is that there's no way to identify the controller in
>> question, so we can't do this automatically, so might just as well do
>> it in the simplest way for now.  :(
>
> Well, a module parameter is no good,
> because that method would affect all attached controllers
> rather than just the one(s) with the issue.
>
> Something in sysfs perhaps.

See the method already described in my previous message.
grep for IMX53_AHCI.

	Jeff

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