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

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Message-ID: <51f3faa71002131453m4dd2b82cgd8b874866146da60@mail.gmail.com>
Date:	Sat, 13 Feb 2010 16:53:20 -0600
From:	Robert Hancock <hancockrwd@...il.com>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	ide <linux-ide@...r.kernel.org>, Mike Cui <cuicui@...il.com>,
	Peer Chen <pchen@...dia.com>, Allen Martin <AMartin@...dia.com>
Subject: Re: [PATCH] ahci: disable FPDMA auto-activate optimization on NVIDIA 
	AHCI

On Sat, Feb 13, 2010 at 4:46 PM, Jeff Garzik <jeff@...zik.org> wrote:
> 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?
>
> Sigh...   we never did hear back from Mike or NVIDIA on this one, did we?
>  I've been watching for a response, and haven't seen one to date.

No, I haven't seen a response. It's pretty apparent it should fix the
problem based on earlier testing, but it would be nice to find out for
sure which chipsets this affects.
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