Re: [PATCH 2/2] PCI / PM: Resume runtime-suspended devices later during system suspend

[Rafael J. Wysocki]

On Monday, February 24, 2014 01:58:05 PM Bjorn Helgaas wrote:
> On Sun, Feb 23, 2014 at 4:21 PM, Rafael J. Wysocki <rjw@xxxxxxxxxxxxx> wrote:
> > From: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
> >
> > Runtime-suspended devices are resumed during system suspend by
> > pci_pm_prepare() for two reasons: First, because they may need
> > to be reprogrammed in order to change their wakeup settings and,
> > second, because they may need to be operatonal for their children
> > to be successfully suspended.  That is a problem, though, if there
> > are many runtime-suspended devices that need to be resumed this
> > way during system suspend, because the .prepare() PM callbacks of
> > devices are executed sequentially and the times taken by them
> > accumulate, which may increase the total system suspend time quite
> > a bit.
> >
> > For this reason, move the resume of runtime-suspended devices up
> > to the next phase of device suspend (during system suspend), except
> > for the ones that have power.ignore_children set.  The exception is
> > made, because the devices with power.ignore_children set may still
> > be necessary for their children to be successfully suspended (during
> > system suspend) and they won't be resumed automatically as a result
> > of the runtime resume of their children.
> >
> > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
> 
> Acked-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
> 
> You can merge these two via your tree if you want.  I don't have any
> changes queued up for pci-driver.c.

I will, thanks!

Rafael

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