Re: [PATCH 3/3] PCI / ACPI: Handle sibling devices sharing power resources

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On Thu, Jun 06, 2019 at 04:27:21PM +0200, Rafael J. Wysocki wrote:
> On Thu, Jun 6, 2019 at 4:17 PM Mika Westerberg
> <mika.westerberg@xxxxxxxxxxxxxxx> wrote:
> >
> > On Thu, Jun 06, 2019 at 04:08:11PM +0200, Rafael J. Wysocki wrote:
> > > That isn't necessary IMO as long as the device are not accessed.  If
> > > the kernel thinks that a given device is in D3cold and doesn't access
> > > it, then it really doesn't matter too much what state the device is in
> > > physically.  On the first access the device should be reinitialized
> > > anyway.
> >
> > But if the device is configured to wake. For example when it detects a
> > hotplug that state is gone when it goes to D0unitialized.
> 
> For this we'll need a pm_runtime_resume() of the dependent device on
> the resource going "on".
> 
> That means we need a list of devices to resume when the resource goes
> "on" after being taken "off".

OK, thanks.



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