diff options
Diffstat (limited to 'drivers/pci/pci-driver.c')
| -rw-r--r-- | drivers/pci/pci-driver.c | 36 |
1 files changed, 29 insertions, 7 deletions
diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c index bf0cee629b60..185be3703343 100644 --- a/drivers/pci/pci-driver.c +++ b/drivers/pci/pci-driver.c @@ -459,16 +459,17 @@ static int pci_restore_standard_config(struct pci_dev *pci_dev) return 0; } +#endif + +#ifdef CONFIG_PM_SLEEP + static void pci_pm_default_resume_early(struct pci_dev *pci_dev) { - pci_restore_standard_config(pci_dev); + pci_power_up(pci_dev); + pci_restore_state(pci_dev); pci_fixup_device(pci_fixup_resume_early, pci_dev); } -#endif - -#ifdef CONFIG_PM_SLEEP - /* * Default "suspend" method for devices that have no driver provided suspend, * or not even a driver at all (second part). @@ -748,6 +749,18 @@ static int pci_pm_suspend_noirq(struct device *dev) pci_pm_set_unknown_state(pci_dev); + /* + * Some BIOSes from ASUS have a bug: If a USB EHCI host controller's + * PCI COMMAND register isn't 0, the BIOS assumes that the controller + * hasn't been quiesced and tries to turn it off. If the controller + * is already in D3, this can hang or cause memory corruption. + * + * Since the value of the COMMAND register doesn't matter once the + * device has been suspended, we can safely set it to 0 here. + */ + if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI) + pci_write_config_word(pci_dev, PCI_COMMAND, 0); + return 0; } @@ -1019,10 +1032,13 @@ static int pci_pm_runtime_suspend(struct device *dev) if (!pm || !pm->runtime_suspend) return -ENOSYS; + pci_dev->no_d3cold = false; error = pm->runtime_suspend(dev); suspend_report_result(pm->runtime_suspend, error); if (error) return error; + if (!pci_dev->d3cold_allowed) + pci_dev->no_d3cold = true; pci_fixup_device(pci_fixup_suspend, pci_dev); @@ -1044,17 +1060,23 @@ static int pci_pm_runtime_suspend(struct device *dev) static int pci_pm_runtime_resume(struct device *dev) { + int rc; struct pci_dev *pci_dev = to_pci_dev(dev); const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; if (!pm || !pm->runtime_resume) return -ENOSYS; - pci_pm_default_resume_early(pci_dev); + pci_restore_standard_config(pci_dev); + pci_fixup_device(pci_fixup_resume_early, pci_dev); __pci_enable_wake(pci_dev, PCI_D0, true, false); pci_fixup_device(pci_fixup_resume, pci_dev); - return pm->runtime_resume(dev); + rc = pm->runtime_resume(dev); + + pci_dev->runtime_d3cold = false; + + return rc; } static int pci_pm_runtime_idle(struct device *dev) |