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PCI: Do not skip power-managed bridges in pci_enable_wake() 

Commit baecc470d5 ("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 themselves.  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>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Mika Westerberg 2018-09-27 16:53:53 -05:00 committed by Bjorn Helgaas
parent f0157160b3
commit ac86e8eeb0
1 changed files with 6 additions and 3 deletions
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9
drivers/pci/pci.c
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@ -2137,10 +2137,13 @@ 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. */