#ifdef CONFIG_PM_SLEEP
-static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev)
-{
- struct pci_driver *drv = pci_dev->driver;
-
- return drv && (drv->suspend || drv->suspend_late || drv->resume
- || drv->resume_early);
-}
-
/*
* Default "suspend" method for devices that have no driver provided suspend,
- * or not even a driver at all.
+ * or not even a driver at all (second part).
*/
-static void pci_default_pm_suspend(struct pci_dev *pci_dev)
+static void pci_pm_set_unknown_state(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.
pci_dev->current_state = PCI_UNKNOWN;
}
-/*
- * 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)
+static int pci_pm_reenable_device(struct pci_dev *pci_dev)
{
int retval;
i = drv->suspend(pci_dev, state);
suspend_report_result(drv->suspend, i);
} else {
- pci_default_pm_suspend(pci_dev);
+ pci_save_state(pci_dev);
+ /*
+ * This is for compatibility with existing code with legacy PM
+ * support.
+ */
+ pci_pm_set_unknown_state(pci_dev);
}
return i;
}
if (drv && drv->resume) {
error = drv->resume(pci_dev);
} else {
- pci_default_pm_resume_early(pci_dev);
- error = pci_default_pm_resume_late(pci_dev);
+ /* restore the PCI config space */
+ pci_restore_state(pci_dev);
+ error = pci_pm_reenable_device(pci_dev);
}
return error;
}
return error;
}
+/* 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_pm_reenable_device(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_pm_default_suspend_generic(pci_dev);
+
+ if (!pci_is_bridge(pci_dev))
+ pci_prepare_to_sleep(pci_dev);
+}
+
+static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev)
+{
+ struct pci_driver *drv = pci_dev->driver;
+ bool ret = drv && (drv->suspend || drv->suspend_late || drv->resume
+ || drv->resume_early);
+
+ /*
+ * Legacy PM support is used by default, so warn if the new framework is
+ * supported as well. Drivers are supposed to support either the
+ * former, or the latter, but not both at the same time.
+ */
+ WARN_ON(ret && drv->driver.pm);
+
+ return ret;
+}
+
+/* New power management framework */
+
static int pci_pm_prepare(struct device *dev)
{
struct device_driver *drv = dev->driver;
struct device_driver *drv = dev->driver;
int error = 0;
+ if (pci_has_legacy_pm_support(pci_dev)) {
+ error = pci_legacy_suspend(dev, PMSG_SUSPEND);
+ goto Exit;
+ }
+
if (drv && drv->pm) {
if (drv->pm->suspend) {
error = drv->pm->suspend(dev);
suspend_report_result(drv->pm->suspend, error);
}
- } else if (pci_has_legacy_pm_support(pci_dev)) {
- error = pci_legacy_suspend(dev, PMSG_SUSPEND);
+ } else {
+ pci_pm_default_suspend(pci_dev);
}
+
+ Exit:
pci_fixup_device(pci_fixup_suspend, pci_dev);
return error;
struct device_driver *drv = dev->driver;
int error = 0;
+ if (pci_has_legacy_pm_support(pci_dev))
+ return pci_legacy_suspend_late(dev, PMSG_SUSPEND);
+
if (drv && drv->pm) {
if (drv->pm->suspend_noirq) {
error = drv->pm->suspend_noirq(dev);
suspend_report_result(drv->pm->suspend_noirq, error);
}
- } else if (pci_has_legacy_pm_support(pci_dev)) {
- error = pci_legacy_suspend_late(dev, PMSG_SUSPEND);
} else {
- pci_default_pm_suspend(pci_dev);
+ pci_pm_set_unknown_state(pci_dev);
}
return error;
struct device_driver *drv = dev->driver;
int error = 0;
- pci_fixup_device(pci_fixup_resume, pci_dev);
+ if (pci_has_legacy_pm_support(pci_dev)) {
+ pci_fixup_device(pci_fixup_resume, pci_dev);
+ return pci_legacy_resume(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)) {
- error = pci_legacy_resume(dev);
} else {
- error = pci_default_pm_resume_late(pci_dev);
+ error = pci_pm_default_resume(pci_dev);
}
return error;
struct device_driver *drv = dev->driver;
int error = 0;
- pci_fixup_device(pci_fixup_resume_early, to_pci_dev(dev));
+ if (pci_has_legacy_pm_support(pci_dev)) {
+ pci_fixup_device(pci_fixup_resume_early, pci_dev);
+ return pci_legacy_resume_early(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)) {
- error = pci_legacy_resume_early(dev);
} else {
- pci_default_pm_resume_early(pci_dev);
+ pci_pm_default_resume_noirq(pci_dev);
}
return error;
struct device_driver *drv = dev->driver;
int error = 0;
+ if (pci_has_legacy_pm_support(pci_dev)) {
+ error = pci_legacy_suspend(dev, PMSG_FREEZE);
+ pci_fixup_device(pci_fixup_suspend, pci_dev);
+ return error;
+ }
+
if (drv && drv->pm) {
if (drv->pm->freeze) {
error = drv->pm->freeze(dev);
suspend_report_result(drv->pm->freeze, error);
}
- } else if (pci_has_legacy_pm_support(pci_dev)) {
- error = pci_legacy_suspend(dev, PMSG_FREEZE);
- pci_fixup_device(pci_fixup_suspend, pci_dev);
+ } else {
+ pci_pm_default_suspend_generic(pci_dev);
}
return error;
struct device_driver *drv = dev->driver;
int error = 0;
+ if (pci_has_legacy_pm_support(pci_dev))
+ return pci_legacy_suspend_late(dev, PMSG_FREEZE);
+
if (drv && drv->pm) {
if (drv->pm->freeze_noirq) {
error = drv->pm->freeze_noirq(dev);
suspend_report_result(drv->pm->freeze_noirq, error);
}
- } else if (pci_has_legacy_pm_support(pci_dev)) {
- error = pci_legacy_suspend_late(dev, PMSG_FREEZE);
} else {
- pci_default_pm_suspend(pci_dev);
+ pci_pm_set_unknown_state(pci_dev);
}
return error;
struct device_driver *drv = dev->driver;
int error = 0;
+ if (pci_has_legacy_pm_support(pci_dev)) {
+ pci_fixup_device(pci_fixup_resume, pci_dev);
+ return pci_legacy_resume(dev);
+ }
+
if (drv && drv->pm) {
if (drv->pm->thaw)
error = drv->pm->thaw(dev);
- } else if (pci_has_legacy_pm_support(pci_dev)) {
- pci_fixup_device(pci_fixup_resume, pci_dev);
- error = pci_legacy_resume(dev);
+ } else {
+ pci_pm_reenable_device(pci_dev);
}
return error;
struct device_driver *drv = dev->driver;
int error = 0;
+ if (pci_has_legacy_pm_support(pci_dev)) {
+ pci_fixup_device(pci_fixup_resume_early, to_pci_dev(dev));
+ return pci_legacy_resume_early(dev);
+ }
+
if (drv && drv->pm) {
if (drv->pm->thaw_noirq)
error = drv->pm->thaw_noirq(dev);
- } else if (pci_has_legacy_pm_support(pci_dev)) {
- pci_fixup_device(pci_fixup_resume_early, to_pci_dev(dev));
- error = pci_legacy_resume_early(dev);
+ } else {
+ pci_update_current_state(pci_dev, PCI_D0);
}
return error;
struct device_driver *drv = dev->driver;
int error = 0;
- pci_fixup_device(pci_fixup_suspend, pci_dev);
+ if (pci_has_legacy_pm_support(pci_dev)) {
+ error = pci_legacy_suspend(dev, PMSG_HIBERNATE);
+ goto Exit;
+ }
if (drv && drv->pm) {
if (drv->pm->poweroff) {
error = drv->pm->poweroff(dev);
suspend_report_result(drv->pm->poweroff, error);
}
- } else if (pci_has_legacy_pm_support(pci_dev)) {
- error = pci_legacy_suspend(dev, PMSG_HIBERNATE);
+ } else {
+ pci_pm_default_suspend(pci_dev);
}
+ Exit:
+ pci_fixup_device(pci_fixup_suspend, pci_dev);
+
return error;
}
struct device_driver *drv = dev->driver;
int error = 0;
+ if (pci_has_legacy_pm_support(to_pci_dev(dev)))
+ return pci_legacy_suspend_late(dev, PMSG_HIBERNATE);
+
if (drv && drv->pm) {
if (drv->pm->poweroff_noirq) {
error = drv->pm->poweroff_noirq(dev);
suspend_report_result(drv->pm->poweroff_noirq, error);
}
- } else if (pci_has_legacy_pm_support(to_pci_dev(dev))) {
- error = pci_legacy_suspend_late(dev, PMSG_HIBERNATE);
}
return error;
struct device_driver *drv = dev->driver;
int error = 0;
+ if (pci_has_legacy_pm_support(pci_dev)) {
+ pci_fixup_device(pci_fixup_resume, pci_dev);
+ return pci_legacy_resume(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)) {
- error = pci_legacy_resume(dev);
} else {
- error = pci_default_pm_resume_late(pci_dev);
+ error = pci_pm_default_resume(pci_dev);
}
- pci_fixup_device(pci_fixup_resume, pci_dev);
return error;
}
struct device_driver *drv = dev->driver;
int error = 0;
- pci_fixup_device(pci_fixup_resume, pci_dev);
+ if (pci_has_legacy_pm_support(pci_dev)) {
+ pci_fixup_device(pci_fixup_resume_early, pci_dev);
+ return pci_legacy_resume_early(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)) {
- error = pci_legacy_resume_early(dev);
} else {
- pci_default_pm_resume_early(pci_dev);
+ pci_pm_default_resume_noirq(pci_dev);
}
- pci_fixup_device(pci_fixup_resume_early, pci_dev);
return error;
}
projects / firefly-linux-kernel-4.4.55.git / blobdiff