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Date:	Fri, 5 Feb 2010 16:57:17 -0700
From:	Bjorn Helgaas <bjorn.helgaas@...com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	"Moore, Robert" <robert.moore@...el.com>,
	Matthew Garrett <mjg@...hat.com>, Len Brown <lenb@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	Linux PCI <linux-pci@...r.kernel.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Oliver Neukum <oliver@...kum.org>,
	Shaohua Li <shaohua.li@...el.com>,
	Gary Hade <garyhade@...ibm.com>
Subject: Re: [PATCH 8/9] PCI / ACPI / PM: Platform support for PCI PME wake-up (rev. 7)

On Sunday 10 January 2010 07:01:03 am Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rjw@...k.pl>
> 
> Although the majority of PCI devices can generate PMEs that in
> principle may be used to wake up devices suspended at run time,
> platform support is generally necessary to convert PMEs into wake-up
> events that can be delivered to the kernel.  If ACPI is used for this
> purpose, a PME generated by a PCI device will trigger the ACPI GPE
> associated with the device to generate an ACPI wake-up event that we
> can set up a handler for, provided that everything is configured
> correctly.

I think acpiphp needs a little attention after this patch.  Gary
Hade noticed while testing Jesse's linux-next branch that acpiphp
complains like this:

  acpiphp: ACPI Hot Plug PCI Controller Driver version: 0.5
  acpiphp: Slot [9] registered
  acpiphp: Slot [10] registered
  acpiphp_glue: failed to register interrupt notify handler
  acpiphp: Slot [6] registered
  acpiphp_glue: failed to register interrupt notify handler

I reproduced this on an HP rx3600 (ia64), and found that acpiphp
doesn't complain on commit 82533a617f453, but it *does* complain
on commit fb3383bb4ac6e, which seems to be this patch.

I haven't tried to debug it any farther than just noticing that
acpiphp starts complaining here, so I don't know what the right
fix is, or even if acpiphp is really broken.

I did use acpiphp to power-cycle a slot ("echo 0 > power"), and
it seemed to work despite the warnings.  But I guess the notification
is probably not involved in that path; I suppose the notification
is like a latch or attention button interrupt or something.

Bjorn
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