linux-kernel - Re: PCI: Add ALI M5229 comaptibility mode quirk

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Message-ID: <20080912134249.GG322@trinity.fluff.org>
Date:	Fri, 12 Sep 2008 14:42:49 +0100
From:	Ben Dooks <ben-linux@...ff.org>
To:	Matthew Wilcox <matthew@....cx>
Cc:	Ben Dooks <ben-linux@...ff.org>, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org, linux-ide@...r.kernel.org,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: PCI: Add ALI M5229 comaptibility mode quirk

On Fri, Sep 12, 2008 at 07:26:37AM -0600, Matthew Wilcox wrote:
> 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.

I'm not convinced by that, I've no idea how that will affect the system
moving PCI BARs after the fact.
 
> -- 
> 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."

-- 
-- 
Ben

Q:      What's a light-year?
A:      One-third less calories than a regular year.

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