linux-kernel - Re: [PATCH] PCI / PCIe: Clear Root PME Status bits early during system resume

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Message-ID: <20101223125435.248105fa@jbarnes-desktop>
Date:	Thu, 23 Dec 2010 12:54:35 -0800
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Matthew Wilcox <matthew@....cx>, linux-pci@...r.kernel.org,
	Matthew Garrett <mjg59@...f.ucam.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"Linux-pm mailing list" <linux-pm@...ts.linux-foundation.org>
Subject: Re: [PATCH] PCI / PCIe: Clear Root PME Status bits early during
 system resume

On Sun, 19 Dec 2010 15:57:16 +0100
"Rafael J. Wysocki" <rjw@...k.pl> wrote:

> From: Rafael J. Wysocki <rjw@...k.pl>
> 
> I noticed that PCI Express PMEs don't work on my Toshiba Portege R500
> after the system has been woken up from a sleep state by a PME
> (through Wake-on-LAN).  After some investigation it turned out that
> the BIOS didn't clear the Root PME Status bit in the root port that
> received the wakeup PME and since the Requester ID was also set in
> the port's Root Status register, any subsequent PMEs didn't trigger
> interrupts.
> 
> This problem can be avoided by clearing the Root PME Status bits in
> all PCI Express root ports during early resume.  For this purpose,
> add an early resume routine to the PCIe port driver and make this
> driver be always registered, even if pci_ports_disable is set (in
> which case the driver's only function is to provide the early
> resume callback).
> 
> Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
> ---
> 

Applied to my linux-next branch, thanks.

-- 
Jesse Barnes, Intel Open Source Technology Center
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