Re: [RFC][PATCH 4/4] PCI/ACPI PM: Propagate wake-up enable for devices w/o ACPI support

Matthew Garrett
2009-09-04T22:06:34Z

On Sat, Sep 05, 2009 at 12:00:32AM +0200, Rafael J. Wysocki wrote:
> > Yes, it's presumably the case that the PME event in the bridge is just
> > tied to the root bridge in the chipset. Do we know what chipset this
> > hardware is? For Intel, at least, GPE behaviour is defined in the
> > chipset docs.
>
> One box is Intel, the other one is based on an ATI (pre-AMD) chipset, but
> the design is similar in that respect.

GPE 0xb will be the one generated by any Intel chipset whenever the
external PCI PME# goes active. 0xd is the equivalent for chipset-level
devices that don't have a GPE of their own. I can't see any way that a
downstream bridge could reasonably generate a GPE, so I'd bet that it's
using 0xb.

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