From mboxrd@z Thu Jan 1 00:00:00 1970 From: Robert Hancock Subject: Re: [PATCH] ahci: disable FPDMA auto-activate optimization on NVIDIA AHCI Date: Sat, 13 Feb 2010 16:53:20 -0600 Message-ID: <51f3faa71002131453m4dd2b82cgd8b874866146da60@mail.gmail.com> References: <4B5FC213.1060601@gmail.com> <4B772BE2.30108@garzik.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from mail-iw0-f201.google.com ([209.85.223.201]:43106 "EHLO mail-iw0-f201.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757796Ab0BMWxV convert rfc822-to-8bit (ORCPT ); Sat, 13 Feb 2010 17:53:21 -0500 In-Reply-To: <4B772BE2.30108@garzik.org> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Jeff Garzik Cc: linux-kernel , ide , Mike Cui , Peer Chen , Allen Martin On Sat, Feb 13, 2010 at 4:46 PM, Jeff Garzik wrote: > On 01/26/2010 11:33 PM, Robert Hancock wrote: >> >> Mike Cui reported that his system with an NVIDIA MCP79 (aka MCP7A) c= hipset >> stopped working with 2.6.32. The problem appears to be that 2.6.32 n= ow >> enables >> the FPDMA auto-activate optimization in the ahci driver. The drive w= orks >> fine >> with this enabled on an Intel AHCI so this appears to be a chipset b= ug. >> 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=3D14922 >> >> Signed-off-by: Robert Hancock >> >> --- >> >> Mike, can you test this out and make sure this resolves the problem = for >> you? > > Sigh... =A0 we never did hear back from Mike or NVIDIA on this one, d= id we? > =A0I'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.