Re: [PATCH][v3] PCI / PM: Avoid resuming PCI devices during system suspend

["Rafael J. Wysocki" <rjw@rjwysocki.net>]

On Friday, January 23, 2015 02:55:25 PM Bjorn Helgaas wrote:
> On Tue, Jan 20, 2015 at 7:17 PM, Rafael J. Wysocki <rjw@rjwysocki.net> wrote:
> > From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> >
> > Commit f25c0ae2b4c4 (ACPI / PM: Avoid resuming devices in ACPI PM
> > domain during system suspend) modified the ACPI PM domain's system
> > suspend callbacks to allow devices attached to it to be left in the
> > runtime-suspended state during system suspend so as to optimize
> > the suspend process.
> >
> > This was based on the general mechanism introduced by commit
> > aae4518b3124 (PM / sleep: Mechanism to avoid resuming runtime-suspended
> > devices unnecessarily).
> >
> > Extend that approach to PCI devices by modifying the PCI bus type's
> > ->prepare callback to return 1 for devices that are runtime-suspended
> > when it is being executed and that are in a suitable power state and
> > need not be resumed going forward.
> >
> > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> 
> I don't profess to understand this, and it seems like something you
> could merge via your PM tree.  So I trust you to do the right thing
> with it :)
> 
> Acked-by: Bjorn Helgaas <bhelgaas@google.com>

Thanks!