Re: [PATCH v2 01/10] PCI: Do not skip power managed bridges in pci_enable_wake()

[Mika Westerberg <mika.westerberg@linux.intel.com>]

On Thu, Sep 13, 2018 at 04:33:39PM +0200, Rafael J. Wysocki wrote:
> On Thursday, September 13, 2018 4:33:13 PM CEST Mika Westerberg wrote:
> > Commit baecc470d5fd ("PCI / PM: Skip bridges in pci_enable_wake()")
> > changed pci_enable_wake() so that all bridges are skipped when wakeup is
> > enabled (or disabled) with the reasoning that bridges can only signal
> > wakeup on behalf of their subordinate devices.
> > 
> > However, there are bridges that can signal wakeup itself. For example
> > PCIe downstream and root ports supporting hotplug may signal wakeup upon
> > hotplug event.
> > 
> > For this reason change pci_enable_wake() so that it skips all bridges
> > except those that we power manage (->bridge_d3 is set). Those are the
> > ones that can go into low power states and may need to signal wakeup.
> > 
> > Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
> > ---
> >  drivers/pci/pci.c | 9 ++++++---
> >  1 file changed, 6 insertions(+), 3 deletions(-)
> > 
> > diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
> > index 29ff9619b5fa..1af6f1887986 100644
> > --- a/drivers/pci/pci.c
> > +++ b/drivers/pci/pci.c
> > @@ -2133,10 +2133,13 @@ static int __pci_enable_wake(struct pci_dev *dev, pci_power_t state, bool enable
> >  	int ret = 0;
> >  
> >  	/*
> > -	 * Bridges can only signal wakeup on behalf of subordinate devices,
> > -	 * but that is set up elsewhere, so skip them.
> > +	 * Bridges that are not power-manageable directly only signal
> > +	 * wakeup on behalf of subordinate devices which is set up
> > +	 * elsewhere, so skip them. However, bridges that are
> > +	 * power-manageable may signal wakeup for themselves (for example,
> > +	 * on a hotplug event) and they need to be covered here.
> >  	 */
> > -	if (pci_has_subordinate(dev))
> > +	if (!pci_power_manageable(dev))
> >  		return 0;
> >  
> >  	/* Don't do the same thing twice in a row for one device. */
> > 
> 
> Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Thanks!

For some reason this patch never hit the mailing lists (others did).
Since you kept the whole context people should still be able to review
it. I can resend this patch as well.