diff options
Diffstat (limited to 'drivers/pci/pci-driver.c')
| -rw-r--r-- | drivers/pci/pci-driver.c | 109 |
1 files changed, 72 insertions, 37 deletions
diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c index bfaa77d88537..750ee79c178f 100644 --- a/drivers/pci/pci-driver.c +++ b/drivers/pci/pci-driver.c @@ -316,21 +316,10 @@ static void pci_device_shutdown(struct device *dev) /* * Default "suspend" method for devices that have no driver provided suspend, - * or not even a driver at all (first part). - */ -static void pci_default_pm_suspend_early(struct pci_dev *pci_dev) -{ - /* If device is enabled at this point, disable it */ - pci_disable_enabled_device(pci_dev); -} - -/* - * Default "suspend" method for devices that have no driver provided suspend, * or not even a driver at all (second part). */ static void pci_default_pm_suspend_late(struct pci_dev *pci_dev) { - pci_save_state(pci_dev); /* * mark its power state as "unknown", since we don't know if * e.g. the BIOS will change its device state when we suspend. @@ -341,16 +330,6 @@ static void pci_default_pm_suspend_late(struct pci_dev *pci_dev) /* * Default "resume" method for devices that have no driver provided resume, - * or not even a driver at all (first part). - */ -static void pci_default_pm_resume_early(struct pci_dev *pci_dev) -{ - /* restore the PCI config space */ - pci_restore_state(pci_dev); -} - -/* - * Default "resume" method for devices that have no driver provided resume, * or not even a driver at all (second part). */ static int pci_default_pm_resume_late(struct pci_dev *pci_dev) @@ -379,9 +358,10 @@ static int pci_legacy_suspend(struct device *dev, pm_message_t state) i = drv->suspend(pci_dev, state); suspend_report_result(drv->suspend, i); } else { + pci_save_state(pci_dev); /* - * For compatibility with existing code with legacy PM support - * don't call pci_default_pm_suspend_early() here. + * This is for compatibility with existing code with legacy PM + * support. */ pci_default_pm_suspend_late(pci_dev); } @@ -410,7 +390,8 @@ static int pci_legacy_resume(struct device *dev) if (drv && drv->resume) { error = drv->resume(pci_dev); } else { - pci_default_pm_resume_early(pci_dev); + /* restore the PCI config space */ + pci_restore_state(pci_dev); error = pci_default_pm_resume_late(pci_dev); } return error; @@ -429,22 +410,72 @@ static int pci_legacy_resume_early(struct device *dev) /* Auxiliary functions used by the new power management framework */ +static int pci_restore_standard_config(struct pci_dev *pci_dev) +{ + struct pci_dev *parent = pci_dev->bus->self; + int error = 0; + + /* Check if the device's bus is operational */ + if (!parent || parent->current_state == PCI_D0) { + pci_restore_state(pci_dev); + pci_update_current_state(pci_dev, PCI_D0); + } else { + dev_warn(&pci_dev->dev, "unable to restore config, " + "bridge %s in low power state D%d\n", pci_name(parent), + parent->current_state); + pci_dev->current_state = PCI_UNKNOWN; + error = -EAGAIN; + } + + return error; +} + static bool pci_is_bridge(struct pci_dev *pci_dev) { return !!(pci_dev->subordinate); } +static void pci_pm_default_resume_noirq(struct pci_dev *pci_dev) +{ + if (pci_restore_standard_config(pci_dev)) + pci_fixup_device(pci_fixup_resume_early, pci_dev); +} + static int pci_pm_default_resume(struct pci_dev *pci_dev) { + /* + * pci_restore_standard_config() should have been called once already, + * but it would have failed if the device's parent bridge had not been + * in power state D0 at that time. Check it and try again if necessary. + */ + if (pci_dev->current_state == PCI_UNKNOWN) { + int error = pci_restore_standard_config(pci_dev); + if (error) + return error; + } + + pci_fixup_device(pci_fixup_resume, pci_dev); + if (!pci_is_bridge(pci_dev)) pci_enable_wake(pci_dev, PCI_D0, false); return pci_default_pm_resume_late(pci_dev); } +static void pci_pm_default_suspend_generic(struct pci_dev *pci_dev) +{ + /* If device is enabled at this point, disable it */ + pci_disable_enabled_device(pci_dev); + /* + * Save state with interrupts enabled, because in principle the bus the + * device is on may be put into a low power state after this code runs. + */ + pci_save_state(pci_dev); +} + static void pci_pm_default_suspend(struct pci_dev *pci_dev) { - pci_default_pm_suspend_early(pci_dev); + pci_pm_default_suspend_generic(pci_dev); if (!pci_is_bridge(pci_dev)) pci_prepare_to_sleep(pci_dev); @@ -529,12 +560,13 @@ static int pci_pm_resume(struct device *dev) struct device_driver *drv = dev->driver; int error = 0; - pci_fixup_device(pci_fixup_resume, pci_dev); - if (drv && drv->pm) { + pci_fixup_device(pci_fixup_resume, pci_dev); + if (drv->pm->resume) error = drv->pm->resume(dev); } else if (pci_has_legacy_pm_support(pci_dev)) { + pci_fixup_device(pci_fixup_resume, pci_dev); error = pci_legacy_resume(dev); } else { error = pci_pm_default_resume(pci_dev); @@ -549,15 +581,16 @@ static int pci_pm_resume_noirq(struct device *dev) struct device_driver *drv = dev->driver; int error = 0; - pci_fixup_device(pci_fixup_resume_early, to_pci_dev(dev)); - if (drv && drv->pm) { + pci_fixup_device(pci_fixup_resume_early, pci_dev); + if (drv->pm->resume_noirq) error = drv->pm->resume_noirq(dev); } else if (pci_has_legacy_pm_support(pci_dev)) { + pci_fixup_device(pci_fixup_resume_early, pci_dev); error = pci_legacy_resume_early(dev); } else { - pci_default_pm_resume_early(pci_dev); + pci_pm_default_resume_noirq(pci_dev); } return error; @@ -589,7 +622,7 @@ static int pci_pm_freeze(struct device *dev) error = pci_legacy_suspend(dev, PMSG_FREEZE); pci_fixup_device(pci_fixup_suspend, pci_dev); } else { - pci_default_pm_suspend_early(pci_dev); + pci_pm_default_suspend_generic(pci_dev); } return error; @@ -647,7 +680,7 @@ static int pci_pm_thaw_noirq(struct device *dev) pci_fixup_device(pci_fixup_resume_early, to_pci_dev(dev)); error = pci_legacy_resume_early(dev); } else { - pci_default_pm_resume_early(pci_dev); + pci_update_current_state(pci_dev, PCI_D0); } return error; @@ -698,12 +731,13 @@ static int pci_pm_restore(struct device *dev) struct device_driver *drv = dev->driver; int error = 0; - pci_fixup_device(pci_fixup_resume, pci_dev); - if (drv && drv->pm) { + pci_fixup_device(pci_fixup_resume, pci_dev); + if (drv->pm->restore) error = drv->pm->restore(dev); } else if (pci_has_legacy_pm_support(pci_dev)) { + pci_fixup_device(pci_fixup_resume, pci_dev); error = pci_legacy_resume(dev); } else { error = pci_pm_default_resume(pci_dev); @@ -718,15 +752,16 @@ static int pci_pm_restore_noirq(struct device *dev) struct device_driver *drv = dev->driver; int error = 0; - pci_fixup_device(pci_fixup_resume_early, pci_dev); - if (drv && drv->pm) { + pci_fixup_device(pci_fixup_resume_early, pci_dev); + if (drv->pm->restore_noirq) error = drv->pm->restore_noirq(dev); } else if (pci_has_legacy_pm_support(pci_dev)) { + pci_fixup_device(pci_fixup_resume_early, pci_dev); error = pci_legacy_resume_early(dev); } else { - pci_default_pm_resume_early(pci_dev); + pci_pm_default_resume_noirq(pci_dev); } return error; |