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SubjectRe: [RFC][PATCH 3/4] PCI / ACPI PM: Platform support for PCI PME wake-up
On Mon, 21 Sep 2009 02:26:10 +0200
"Rafael J. Wysocki" <rjw@sisk.pl> wrote:

> On Monday 14 September 2009, Matthew Garrett wrote:
> > On Mon, Sep 14, 2009 at 12:53:05AM +0200, Rafael J. Wysocki wrote:
> > > On Monday 14 September 2009, Matthew Garrett wrote:
> > > > On Sun, Sep 13, 2009 at 11:24:03PM +0200, Rafael J. Wysocki
> > > > wrote:
> > > > > + } else if (!dev->wakeup.flags.run_wake) {
> > > > > + acpi_set_gpe_type(dev->wakeup.gpe_device,
> > > > > +
> > > > > dev->wakeup.gpe_number,
> > > > > + ACPI_GPE_TYPE_WAKE);
> > > >
> > > > Is this going to work for cases where we have multiple devices
> > > > attached to the same GPE? The common one is EHCI, where both
> > > > EHCI HCDs will be one a single GPE. If we wake one, that'll
> > > > then disable the GPE for the other. Further wakeup events will
> > > > then be lost.
> > >
> > > You're right, I overlooked that. Some kind of refcounting is
> > > needed here.
> >
> > I've sent patches to implement this at the GPE level, which also
> > change the API for requesting them. I'm waiting on feedback from
> > Bob Moore.
>
> In the meantime I realized there's one more thing we need to take
> care of. Namely, if a wake-up GPE is shared between multiple devices,
> it need not be necessary to install notify handlers for all of them.
> For example, if one of these devices is the root bridge, we will walk
> all of the hierarchy under it looking for devices that have PME set,
> so we need not install notify handlers for any devices that share the
> wake-up GPE with the root bridge. Similarly, there's no need to
> install a notify handler for a device that shares the wake-up GPE
> with a bridge (non-root) it is under.
>
> Taking that into account I have prepared another version of the
> @subject patch which is appended below. It also takes the PM vs
> hotplug issue into account. The idea is pretty straightforward,
> everything should be clear from the changelog and the comments within
> the patch.
>

What's the latest on this set? Is this the final version? Anyone have
issues with this version?

Thanks,
--
Jesse Barnes, Intel Open Source Technology Center


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