linux-kernel - Re: [PATCH] PCI quirk: AMD 780: work around wrong vendor ID on APC bridge

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Message-ID: <20100528122521.71ecab11@virtuousgeek.org>
Date:	Fri, 28 May 2010 12:25:21 -0700
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	Clemens Ladisch <clemens@...isch.de>
Cc:	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PCI quirk: AMD 780: work around wrong vendor ID on APC
 bridge

On Wed, 26 May 2010 12:21:10 +0200
Clemens Ladisch <clemens@...isch.de> wrote:

> In all AMD 780 family northbridges, the vendor ID of the internal
> graphics PCI/PCI bridge reads not as AMD but as that of the mainboard
> vendor, because the hardware actually returns the value of the subsystem
> vendor ID (erratum 18).
> 
> We currently have additional quirk entries for Asus and Acer, but it is
> likely that we will encounter more systems with other vendor IDs.
> 
> Since we do not know in advance all possible vendor IDs, a better way to
> find the device is to declare the quirk on the host bridge, whose ID is
> always correct, and use that device as a stepping stone to find the PCI/
> PCI bridge, if present.
> 
> Signed-off-by: Clemens Ladisch <clemens@...isch.de>

Applied to my for-linus branch, thanks.

-- 
Jesse Barnes, Intel Open Source Technology Center
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