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| author | Alan Stern <stern@rowland.harvard.edu> | 2016-10-21 16:45:38 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-01-09 08:22:00 +0100 |
| commit | 1f93d1a77b176282b3ae1842a9d353422bb32b1a (patch) | |
| tree | 2879d6ceddee4941fbc7e6caa23a5224e384631d | |
| parent | c75bc2bde1025ed047ba7f33d7509c76231f47ce (diff) | |
| download | linux-stable-1f93d1a77b176282b3ae1842a9d353422bb32b1a.tar.gz linux-stable-1f93d1a77b176282b3ae1842a9d353422bb32b1a.tar.bz2 linux-stable-1f93d1a77b176282b3ae1842a9d353422bb32b1a.zip | |
PCI: Check for PME in targeted sleep state
commit 6496ebd7edf446fccf8266a1a70ffcb64252593e upstream.
One some systems, the firmware does not allow certain PCI devices to be put
in deep D-states. This can cause problems for wakeup signalling, if the
device does not support PME# in the deepest allowed suspend state. For
example, Pierre reports that on his system, ACPI does not permit his xHCI
host controller to go into D3 during runtime suspend -- but D3 is the only
state in which the controller can generate PME# signals. As a result, the
controller goes into runtime suspend but never wakes up, so it doesn't work
properly. USB devices plugged into the controller are never detected.
If the device relies on PME# for wakeup signals but is not capable of
generating PME# in the target state, the PCI core should accurately report
that it cannot do wakeup from runtime suspend. This patch modifies the
pci_dev_run_wake() routine to add this check.
Reported-by: Pierre de Villemereuil <flyos@mailoo.org>
Tested-by: Pierre de Villemereuil <flyos@mailoo.org>
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
CC: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/pci/pci.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index aab9d5115a5f..24db77ea5093 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -2064,6 +2064,10 @@ bool pci_dev_run_wake(struct pci_dev *dev) if (!dev->pme_support) return false; + /* PME-capable in principle, but not from the intended sleep state */ + if (!pci_pme_capable(dev, pci_target_state(dev))) + return false; + while (bus->parent) { struct pci_dev *bridge = bus->self; |