linux-kernel - Re: [PATCH 2.6.32.3] ahci: AHCI and RAID mode SATA patch for Intel Cougar Point DeviceIDs

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Date:	Thu, 14 Jan 2010 18:15:56 -0600
From:	Robert Hancock <hancockrwd@...il.com>
To:	Henrique de Moraes Holschuh <hmh@....eng.br>
Cc:	Jeff Garzik <jgarzik@...ox.com>,
	Seth Heasley <seth.heasley@...el.com>,
	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2.6.32.3] ahci: AHCI and RAID mode SATA patch for Intel 
	Cougar Point DeviceIDs

On Thu, Jan 14, 2010 at 2:11 PM, Henrique de Moraes Holschuh
<hmh@....eng.br> wrote:
> On Wed, 13 Jan 2010, Robert Hancock wrote:
>> Hmm, it seems like it's a bit more complicated than that. For ICH6R
>> (0x2652), ata_piix attaches to it regardless of mode intentionally, it
>> has specific logic to disable AHCI on the controller since it can be
>> used in either mode. That seems a bit questionable. Having the same
>> device being handled by different enabled drivers and depending on
>> link or module load order to decide which one loads is fragile and
>> prone to errors. I'd be in favor of removing the ICH6R support from
>> ata_piix entirely and saying that you should be using ahci for that
>> device. Maybe when ahci was immature there was a benefit to allowing
>> ata_piix to run it, but I doubt that's true today.
>
> Maybe it is the silicon AHCI in ICH6R that is immature, and one is much
> better of using it in IDE mode?

That seems unlikely, since the Intel-provided Matrix Storage drivers
for that controller on Windows will be using AHCI mode..
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