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

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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@xxxxxxxxx>

---

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.

	Jeff




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