On Fri, Aug 21, 2009 at 05:23:16PM +0800, Matthew Garrett wrote: > On Fri, Aug 21, 2009 at 02:33:50PM +0800, Shaohua Li wrote: > > On Thu, Aug 20, 2009 at 03:40:51PM +0800, Matthew Garrett wrote: > > > _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. > > Right, but the event is sent to a bridge. The devices under the bridge invoke > > wakeup event, not the bridge itself. So you must scan all devices under the > > bridge to check which device has its PME registers set. > > So the bridge case isn't what you said (notification always sent to a specific > > device which invokes the wakeup event) > > Yes, but that's fine because the PME state tells us exactly which device > caused the wakeup. We'll never get a bus notification if the wakeup is > triggered by UHCI on Intel. Hmm, but here what we are talking about is if notification is always sent to the device which invokes wakeup event. I pointed out this isn't true because BIOS might sent notification to a pci bridge and OS should scan devices under the bridge to check which devices invokes it by looking at PME state. Looks you are talking about other things. Thanks, Shaohua _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
