linux-kernel - Re: [PATCH] ahci: disable FPDMA auto-activate optimization on NVIDIA AHCI

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Message-ID: <4B85F267.8090907@garzik.org>
Date:	Wed, 24 Feb 2010 22:45:43 -0500
From:	Jeff Garzik <jeff@...zik.org>
To:	Robert Hancock <hancockrwd@...il.com>
CC:	linux-kernel <linux-kernel@...r.kernel.org>,
	ide <linux-ide@...r.kernel.org>, Mike Cui <cuicui@...il.com>,
	Peer Chen <pchen@...dia.com>
Subject: Re: [PATCH] ahci: disable FPDMA auto-activate optimization on NVIDIA
 AHCI

On 01/26/2010 11:33 PM, Robert Hancock wrote:
> Mike Cui reported that his system with an NVIDIA MCP79 (aka MCP7A) chipset
> stopped working with 2.6.32. The problem appears to be that 2.6.32 now enables
> the FPDMA auto-activate optimization in the ahci driver. The drive works fine
> with this enabled on an Intel AHCI so this appears to be a chipset bug.
> Since MCP79 is a fairly recent NVIDIA chipset and we don't have any info on
> whether any other NVIDIA chipsets have this issue, disable FPDMA AA optimization
> on all NVIDIA AHCI controllers for now.
>
> Should address http://bugzilla.kernel.org/show_bug.cgi?id=14922
>
> Signed-off-by: Robert Hancock<hancockrwd@...il.com>
>
> ---
>
> Mike, can you test this out and make sure this resolves the problem for you?

applied


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