klist_add_tail(&dev->p->knode_driver, &dev->driver->p->klist_devices);
+ device_pm_check_callbacks(dev);
+
/*
* Make sure the device is no longer in one of the deferred lists and
* kick off retrying all pending devices
dev->pm_domain->dismiss(dev);
klist_remove(&dev->p->knode_driver);
+ device_pm_check_callbacks(dev);
if (dev->bus)
blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
BUS_NOTIFY_UNBOUND_DRIVER,
{
pr_debug("PM: Adding info for %s:%s\n",
dev->bus ? dev->bus->name : "No Bus", dev_name(dev));
+ device_pm_check_callbacks(dev);
mutex_lock(&dpm_list_mtx);
if (dev->parent && dev->parent->power.is_prepared)
dev_warn(dev, "parent %s should not be sleeping\n",
mutex_unlock(&dpm_list_mtx);
device_wakeup_disable(dev);
pm_runtime_remove(dev);
+ device_pm_check_callbacks(dev);
}
/**
dev->power.wakeup_path = device_may_wakeup(dev);
+ if (dev->power.no_pm_callbacks) {
+ ret = 1; /* Let device go direct_complete */
+ goto unlock;
+ }
+
if (dev->pm_domain) {
info = "preparing power domain ";
callback = dev->pm_domain->ops.prepare;
if (callback)
ret = callback(dev);
+unlock:
device_unlock(dev);
if (ret < 0) {
device_pm_unlock();
}
EXPORT_SYMBOL_GPL(dpm_for_each_dev);
+
+static bool pm_ops_is_empty(const struct dev_pm_ops *ops)
+{
+ if (!ops)
+ return true;
+
+ return !ops->prepare &&
+ !ops->suspend &&
+ !ops->suspend_late &&
+ !ops->suspend_noirq &&
+ !ops->resume_noirq &&
+ !ops->resume_early &&
+ !ops->resume &&
+ !ops->complete;
+}
+
+void device_pm_check_callbacks(struct device *dev)
+{
+ spin_lock_irq(&dev->power.lock);
+ dev->power.no_pm_callbacks =
+ (!dev->bus || pm_ops_is_empty(dev->bus->pm)) &&
+ (!dev->class || pm_ops_is_empty(dev->class->pm)) &&
+ (!dev->type || pm_ops_is_empty(dev->type->pm)) &&
+ (!dev->pm_domain || pm_ops_is_empty(&dev->pm_domain->ops)) &&
+ (!dev->driver || pm_ops_is_empty(dev->driver->pm));
+ spin_unlock_irq(&dev->power.lock);
+}
extern void device_pm_move_before(struct device *, struct device *);
extern void device_pm_move_after(struct device *, struct device *);
extern void device_pm_move_last(struct device *);
+extern void device_pm_check_callbacks(struct device *dev);
#else /* !CONFIG_PM_SLEEP */
struct device *devb) {}
static inline void device_pm_move_last(struct device *dev) {}
+static inline void device_pm_check_callbacks(struct device *dev) {}
+
#endif /* !CONFIG_PM_SLEEP */
static inline void device_pm_init(struct device *dev)