linux-kernel - Re: PME via interrupt or SCI mechanism?

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Message-ID: <20111001003010.GA26349@xanatos>
Date:	Fri, 30 Sep 2011 17:30:10 -0700
From:	Sarah Sharp <sarah.a.sharp@...ux.intel.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	linux-acpi@...r.kernel.org, linux-pci@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>,
	Matthew Garrett <mjg59@...f.ucam.org>
Subject: Re: PME via interrupt or SCI mechanism?

On Fri, Sep 30, 2011 at 10:21:06PM +0200, Rafael J. Wysocki wrote:
> OK, please test the appended patch.  The difference is that it should only
> continuously poll devices that don't get notifications.  You'll still see
> the debug messages from your previous patches, but this one should be a bit
> less wasteful than the previous one in general.

This patch seems to work.  The GPE fires and the xHCI host controller
comes out of D3 after a stream of:

Sep 30 17:07:32 talon kernel: [  197.745312] ehci_hcd 0000:00:1d.0: pci_acpi_wake_dev
Sep 30 17:07:32 talon kernel: [  197.745321] ehci_hcd 0000:00:1a.0: pci_acpi_wake_dev
Sep 30 17:07:32 talon kernel: [  197.745326] snd_hda_intel 0000:00:1b.0: pci_acpi_wake_dev
Sep 30 17:07:32 talon kernel: [  197.745331] e1000e 0000:00:19.0: pci_acpi_wake_dev

It does seem to take less time to come out of D3 than the previous patch
though.

I occasionally do not see the host controller come out of D3 when I plug
in a new device, but the interrupt count for GPE 0D doesn't increment
when that happens, so it's probably just a BIOS or hardware bug.  Did
mention this was bleeding edge hardware?

Sarah Sharp
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