linux-kernel - Re: [PATCH 1/8] PCI PCIe portdrv: Remove root ports MSI quirk

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Message-Id: <200901100033.09569.rjw@sisk.pl>
Date:	Sat, 10 Jan 2009 00:33:09 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>
Cc:	Linux PCI <linux-pci@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/8] PCI PCIe portdrv: Remove root ports MSI quirk

On Saturday 10 January 2009, Jesse Barnes wrote:
> On Sunday, January 4, 2009 2:48 pm Rafael J. Wysocki wrote:
> > From: Rafael J. Wysocki <rjw@...k.pl>
> >
> > 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
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