From mboxrd@z Thu Jan 1 00:00:00 1970 From: Matthew Wilcox Subject: Re: PCI: Add ALI M5229 comaptibility mode quirk Date: Fri, 12 Sep 2008 07:26:37 -0600 Message-ID: <20080912132637.GB10844@parisc-linux.org> References: <20080912112252.505651015@fluff.org.uk> <20080912123339.GA10844@parisc-linux.org> <20080912130043.GF322@trinity.fluff.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from palinux.external.hp.com ([192.25.206.14]:48719 "EHLO mail.parisc-linux.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751676AbYILN0y (ORCPT ); Fri, 12 Sep 2008 09:26:54 -0400 Content-Disposition: inline In-Reply-To: <20080912130043.GF322@trinity.fluff.org> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Ben Dooks Cc: linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linux-ide@vger.kernel.org, Alan Cox On Fri, Sep 12, 2008 at 02:00:43PM +0100, Ben Dooks wrote: > On Fri, Sep 12, 2008 at 06:33:40AM -0600, Matthew Wilcox wrote: > > On Fri, Sep 12, 2008 at 12:22:52PM +0100, Ben Dooks wrote: > > > The M5229 implementation embedded into the ALI M1543 uses the > > > M1543's ISA PIC to provide the interrupts and thus does not have > > > an valid PCI IRQ set. This quirk detects the abscence of IRQ and > > > sets the M5229 back into compatibility mode to use IRQs 14 and 15 > > > so that libata works correctly. > > > > Why does this need to be a quirk rather than something in the libata ALi > > driver? > > The short answer is that "Alan Cox says not in libata", the longer > one can be found: > > http://www.archivum.info/linux-ide@vger.kernel.org/2008-07/msg00410.html Thanks for the reference. I've now read that thread. I'm not entirely convinced Alan is right; I think it's preferable to confine this quirking to the driver and fix up the BARs in the driver as well. -- Matthew Wilcox Intel Open Source Technology Centre "Bill, look, we understand that you're interested in selling us this operating system, but compare it to ours. We can't possibly take such a retrograde step."