diff options
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/pci-driver.c | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c index cae630fe6387..5eadbc3d0969 100644 --- a/drivers/pci/pci-driver.c +++ b/drivers/pci/pci-driver.c @@ -734,6 +734,8 @@ static int pci_pm_suspend(struct device *dev) struct pci_dev *pci_dev = to_pci_dev(dev); const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; + pci_dev->skip_bus_pm = false; + if (pci_has_legacy_pm_support(pci_dev)) return pci_legacy_suspend(dev, PMSG_SUSPEND); @@ -827,7 +829,20 @@ static int pci_pm_suspend_noirq(struct device *dev) } } - if (!pci_dev->state_saved) { + if (pci_dev->skip_bus_pm) { + /* + * The function is running for the second time in a row without + * going through full resume, which is possible only during + * suspend-to-idle in a spurious wakeup case. Moreover, the + * device was originally left in D0, so its power state should + * not be changed here and the device register values saved + * originally should be restored on resume again. + */ + pci_dev->state_saved = true; + } else if (pci_dev->state_saved) { + if (pci_dev->current_state == PCI_D0) + pci_dev->skip_bus_pm = true; + } else { pci_save_state(pci_dev); if (pci_power_manageable(pci_dev)) pci_prepare_to_sleep(pci_dev); |