From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759959AbZAIXeZ (ORCPT ); Fri, 9 Jan 2009 18:34:25 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757663AbZAIXd6 (ORCPT ); Fri, 9 Jan 2009 18:33:58 -0500 Received: from ogre.sisk.pl ([217.79.144.158]:59480 "EHLO ogre.sisk.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756955AbZAIXd5 (ORCPT ); Fri, 9 Jan 2009 18:33:57 -0500 From: "Rafael J. Wysocki" To: Jesse Barnes Subject: Re: [PATCH 1/8] PCI PCIe portdrv: Remove root ports MSI quirk Date: Sat, 10 Jan 2009 00:33:09 +0100 User-Agent: KMail/1.10.3 (Linux/2.6.28-rjw; KDE/4.1.3; x86_64; ; ) Cc: Linux PCI , LKML References: <200901042346.42723.rjw@sisk.pl> <200901042348.22012.rjw@sisk.pl> <200901091518.25220.jbarnes@virtuousgeek.org> In-Reply-To: <200901091518.25220.jbarnes@virtuousgeek.org> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-2" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200901100033.09569.rjw@sisk.pl> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Saturday 10 January 2009, Jesse Barnes wrote: > On Sunday, January 4, 2009 2:48 pm Rafael J. Wysocki wrote: > > From: Rafael J. Wysocki > > > > The PCI Express port driver contains a quirk that prevents root > > ports from using MSI, but there is no explanation for it and the > > PCI Express specification clearly allows root ports to use MSI. > > Ah ignore my last message, it really does look like some chipsets are just > buggy here, and the quirk only affects a few, so it should be pretty harmless > for the most part (iow I don't think this patch is a good idea on those > chipsets). But this means we're not going to use MSI for PCIe PME at all, for example. I'd be very much interested in learning which chipsets are affected and whether we can make the quirk more specific. Thanks, Rafael