linux-kernel - Re: [PATCH 2/2] PNP: work around Dell 1536/1546 BIOS MMCONFIG bug that breaks USB

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Message-ID: <CAErSpo6=yHFspY_L0rQa6iVD692nYyL=BR=3qBwc3UV8M16xbw@mail.gmail.com>
Date:	Thu, 5 Jan 2012 14:30:13 -0700
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>
Cc:	thuban@...gularity.fr, dann frazier <dann.frazier@...onical.com>,
	Lisa Salimbas <lisa.salimbas@...onical.com>,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	Len Brown <lenb@...nel.org>
Subject: Re: [PATCH 2/2] PNP: work around Dell 1536/1546 BIOS MMCONFIG bug
 that breaks USB

On Thu, Jan 5, 2012 at 2:27 PM, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
> Some Dell BIOSes have MCFG tables that don't report the entire
> MMCONFIG area claimed by the chipset.  If we move PCI devices into
> that claimed-but-unreported area, they don't work.
>
> This quirk reads the AMD MMCONFIG MSRs and adds PNP0C01 resources as
> needed to cover the entire area.

PNP stuff usually goes through Len's ACPI tree, but this is really
x86-specific, and these two patches need to go together, so I think it
would make sense to put them both in the x86 tree.  Len, do you
object?

Bjorn
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