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| author | Alan Stern <stern@rowland.harvard.edu> | 2016-10-21 23:45:38 +0300 |
|---|---|---|
| committer | Sasha Levin <alexander.levin@verizon.com> | 2017-01-14 01:59:59 +0300 |
| commit | 8537ab5ad79f6d528df8ef6a7ea4a3f44087ae90 (patch) | |
| tree | c961972006791d9fbd855ef4cd5e5fd51b4eb702 /drivers/pci | |
| parent | 066820f3484ea8f01a27f640d54b17907073e791 (diff) | |
| download | linux-8537ab5ad79f6d528df8ef6a7ea4a3f44087ae90.tar.xz | |
PCI: Check for PME in targeted sleep state
[ Upstream commit 6496ebd7edf446fccf8266a1a70ffcb64252593e ]
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: stable@vger.kernel.org
CC: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Diffstat (limited to 'drivers/pci')
| -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 94ff20e9a8a0..33d83b0d1318 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -1987,6 +1987,10 @@ 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; |