linux-kernel - Re: ata2: SATA link down (SStatus 611 SControl 300)

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Message-ID: <48054515.4020202@gmail.com>
Date:	Wed, 16 Apr 2008 09:15:17 +0900
From:	Tejun Heo <htejun@...il.com>
To:	Paul Collins <paul@...ly.ondioline.org>
CC:	Jeff Garzik <jeff@...zik.org>, linux-kernel@...r.kernel.org
Subject: Re: ata2: SATA link down (SStatus 611 SControl 300)

Paul Collins wrote:
> Tejun Heo <htejun@...il.com> writes:
> 
>> Paul Collins wrote:
>>> I found a setting labelled "SATA Power Management".  It was set to
>>> "Enable".  When I set it to "Disable", 2.6.25-rc9 detected the optical
>>> drive.
>> This can't be something changed between 2.6.24 and 2.6.25-rc9.  Can
>> you please double check that?
> 
> I double-checked as follows:
> 
> * Verified "SATA Power Management" set to "Enable"
> * Verified optical device present in 2.6.24.3
> * Verified optical device not present in 2.6.25-rc9

Thanks for checking.  Yeah, on the second though, ata_piix as of 
2.6.24.3 doesn't have SCR access at all, so it would have just worked. 
Maybe what's necessary is more refined link onlineness test.  I'll prep 
a patch.

-- 
tejun
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