Re: [PATCH 1/5] introduce .wakeup_event ops

Matthew Garrett
2009-08-20T07:41:02Z

On Thu, Aug 20, 2009 at 11:24:50AM +0800, Shaohua Li wrote:
> On Wed, Aug 19, 2009 at 07:52:10PM +0800, Matthew Garrett wrote:
> > I'm not averse to the general concept, but I'm not entirely sold on it
> > being necessary. All the hardware I'm aware of will send non-PME events
> > as a notification on a specific device. Under what circumstances will we
> > get a wakeup GPE for a non-PME device without knowing which device
> > should be woken?
> Below code is gotten from a laptop (samsung-x10), the PCIB is the PCI bridge.
> We can't guarantee the device which gets a wakeup event notification is really
> the device which invokes the wakeup event.

_L0B will only be triggered if a PME is generated, so we'll be able to
determine which device generated the wakeup by looking at the PME
registers.

--
Matthew Garrett | mjg59@srcf.ucam.org