linux-kernel - Re: [Update 2x][PATCH 1/2] ACPI / PM: Always enable wakeup GPEs when enabling device wakeup

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Date:	Tue, 22 Jul 2014 03:02:29 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux PM list <linux-pm@...r.kernel.org>,
	Linux PCI <linux-pci@...r.kernel.org>,
	Zhang Rui <rui.zhang@...el.com>
Subject: Re: [Update 2x][PATCH 1/2] ACPI / PM: Always enable wakeup GPEs when enabling device wakeup

On Monday, July 21, 2014 10:17:34 AM Peter Zijlstra wrote:
> On Mon, Jul 21, 2014 at 01:51:46AM +0200, Rafael J. Wysocki wrote:
> > From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> > Subject: ACPI / PM: Always enable wakeup GPEs when enabling device wakeup
> > 
> > Wakeup GPEs are currently only enabled when setting up devices for
> > remote wakeup at run time.  During system-wide transitions they are
> > enabled by ACPICA at the very last stage of suspend (before asking
> > the BIOS to take over).  Of course, that only works for system
> > sleep states supported by ACPI, so in particular it doesn't work
> > for the "freeze" sleep state.
> > 
> > For this reason, modify the ACPI core device PM code to enable wakeup
> > GPEs for devices when setting them up for wakeup regardless of whether
> > that is remote wakeup at runtime or system wakeup.  That allows the
> > same device wakeup setup routine to be used for both runtime PM and
> > system-wide PM and makes it possible to reduce code size quite a bit.
> > 
> > That should make things like ACPI-based PCI Wake-on-LAN work with
> > the "freeze" sleep state among other things.
> > 
> > Tested-on: Toshiba Portege R500
> > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> > ---
> > 
> > The PCI ACPI device PM notify handler has to be updated to avoid running
> > runtime resume callbacks during system suspend too.
> 
> So I tested the first version, with that my WSM-EP didn't resume on WoL
> and pressing the power button after the WoL had it crash and burn in the
> igb driver.
> 
> Today I tested this latest version and WoL still didn't trigger a
> resume, but the power button did make it go again, no crashes and I
> suppose I can confirm the earlier patch that stopped making it go halt
> works.

OK, thanks!

> When I 'halt' I can wake the machine back up using a WoL so that all
> _should_ work afaik.

Yes, it should.

I'll send an updated patchset shortly, so please test that one.  If it
doesn't help, we'll need to dig deeper still.

Rafael

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