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path: root/drivers/base/power/runtime.c
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Diffstat (limited to 'drivers/base/power/runtime.c')
-rw-r--r--drivers/base/power/runtime.c93
1 files changed, 70 insertions, 23 deletions
diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
index 02c652be83e7..54597c859ecb 100644
--- a/drivers/base/power/runtime.c
+++ b/drivers/base/power/runtime.c
@@ -168,6 +168,7 @@ static int rpm_check_suspend_allowed(struct device *dev)
static int rpm_idle(struct device *dev, int rpmflags)
{
int (*callback)(struct device *);
+ int (*domain_callback)(struct device *);
int retval;
retval = rpm_check_suspend_allowed(dev);
@@ -213,19 +214,28 @@ static int rpm_idle(struct device *dev, int rpmflags)
dev->power.idle_notification = true;
- if (dev->bus && dev->bus->pm && dev->bus->pm->runtime_idle)
- callback = dev->bus->pm->runtime_idle;
- else if (dev->type && dev->type->pm && dev->type->pm->runtime_idle)
+ if (dev->type && dev->type->pm)
callback = dev->type->pm->runtime_idle;
else if (dev->class && dev->class->pm)
callback = dev->class->pm->runtime_idle;
+ else if (dev->bus && dev->bus->pm)
+ callback = dev->bus->pm->runtime_idle;
else
callback = NULL;
- if (callback) {
+ if (dev->pwr_domain)
+ domain_callback = dev->pwr_domain->ops.runtime_idle;
+ else
+ domain_callback = NULL;
+
+ if (callback || domain_callback) {
spin_unlock_irq(&dev->power.lock);
- callback(dev);
+ if (domain_callback)
+ retval = domain_callback(dev);
+
+ if (!retval && callback)
+ callback(dev);
spin_lock_irq(&dev->power.lock);
}
@@ -250,13 +260,16 @@ static int rpm_callback(int (*cb)(struct device *), struct device *dev)
if (!cb)
return -ENOSYS;
- spin_unlock_irq(&dev->power.lock);
+ if (dev->power.irq_safe) {
+ retval = cb(dev);
+ } else {
+ spin_unlock_irq(&dev->power.lock);
- retval = cb(dev);
+ retval = cb(dev);
- spin_lock_irq(&dev->power.lock);
+ spin_lock_irq(&dev->power.lock);
+ }
dev->power.runtime_error = retval;
-
return retval;
}
@@ -369,12 +382,12 @@ static int rpm_suspend(struct device *dev, int rpmflags)
__update_runtime_status(dev, RPM_SUSPENDING);
- if (dev->bus && dev->bus->pm && dev->bus->pm->runtime_suspend)
- callback = dev->bus->pm->runtime_suspend;
- else if (dev->type && dev->type->pm && dev->type->pm->runtime_suspend)
+ if (dev->type && dev->type->pm)
callback = dev->type->pm->runtime_suspend;
else if (dev->class && dev->class->pm)
callback = dev->class->pm->runtime_suspend;
+ else if (dev->bus && dev->bus->pm)
+ callback = dev->bus->pm->runtime_suspend;
else
callback = NULL;
@@ -387,6 +400,8 @@ static int rpm_suspend(struct device *dev, int rpmflags)
else
pm_runtime_cancel_pending(dev);
} else {
+ if (dev->pwr_domain)
+ rpm_callback(dev->pwr_domain->ops.runtime_suspend, dev);
no_callback:
__update_runtime_status(dev, RPM_SUSPENDED);
pm_runtime_deactivate_timer(dev);
@@ -404,12 +419,15 @@ static int rpm_suspend(struct device *dev, int rpmflags)
goto out;
}
- if (parent && !parent->power.ignore_children) {
- spin_unlock_irq(&dev->power.lock);
+ /* Maybe the parent is now able to suspend. */
+ if (parent && !parent->power.ignore_children && !dev->power.irq_safe) {
+ spin_unlock(&dev->power.lock);
- pm_request_idle(parent);
+ spin_lock(&parent->power.lock);
+ rpm_idle(parent, RPM_ASYNC);
+ spin_unlock(&parent->power.lock);
- spin_lock_irq(&dev->power.lock);
+ spin_lock(&dev->power.lock);
}
out:
@@ -527,10 +545,13 @@ static int rpm_resume(struct device *dev, int rpmflags)
if (!parent && dev->parent) {
/*
- * Increment the parent's resume counter and resume it if
- * necessary.
+ * Increment the parent's usage counter and resume it if
+ * necessary. Not needed if dev is irq-safe; then the
+ * parent is permanently resumed.
*/
parent = dev->parent;
+ if (dev->power.irq_safe)
+ goto skip_parent;
spin_unlock(&dev->power.lock);
pm_runtime_get_noresume(parent);
@@ -553,18 +574,22 @@ static int rpm_resume(struct device *dev, int rpmflags)
goto out;
goto repeat;
}
+ skip_parent:
if (dev->power.no_callbacks)
goto no_callback; /* Assume success. */
__update_runtime_status(dev, RPM_RESUMING);
- if (dev->bus && dev->bus->pm && dev->bus->pm->runtime_resume)
- callback = dev->bus->pm->runtime_resume;
- else if (dev->type && dev->type->pm && dev->type->pm->runtime_resume)
+ if (dev->pwr_domain)
+ rpm_callback(dev->pwr_domain->ops.runtime_resume, dev);
+
+ if (dev->type && dev->type->pm)
callback = dev->type->pm->runtime_resume;
else if (dev->class && dev->class->pm)
callback = dev->class->pm->runtime_resume;
+ else if (dev->bus && dev->bus->pm)
+ callback = dev->bus->pm->runtime_resume;
else
callback = NULL;
@@ -584,7 +609,7 @@ static int rpm_resume(struct device *dev, int rpmflags)
rpm_idle(dev, RPM_ASYNC);
out:
- if (parent) {
+ if (parent && !dev->power.irq_safe) {
spin_unlock_irq(&dev->power.lock);
pm_runtime_put(parent);
@@ -1065,7 +1090,6 @@ EXPORT_SYMBOL_GPL(pm_runtime_allow);
* Set the power.no_callbacks flag, which tells the PM core that this
* device is power-managed through its parent and has no run-time PM
* callbacks of its own. The run-time sysfs attributes will be removed.
- *
*/
void pm_runtime_no_callbacks(struct device *dev)
{
@@ -1078,6 +1102,27 @@ void pm_runtime_no_callbacks(struct device *dev)
EXPORT_SYMBOL_GPL(pm_runtime_no_callbacks);
/**
+ * pm_runtime_irq_safe - Leave interrupts disabled during callbacks.
+ * @dev: Device to handle
+ *
+ * Set the power.irq_safe flag, which tells the PM core that the
+ * ->runtime_suspend() and ->runtime_resume() callbacks for this device should
+ * always be invoked with the spinlock held and interrupts disabled. It also
+ * causes the parent's usage counter to be permanently incremented, preventing
+ * the parent from runtime suspending -- otherwise an irq-safe child might have
+ * to wait for a non-irq-safe parent.
+ */
+void pm_runtime_irq_safe(struct device *dev)
+{
+ if (dev->parent)
+ pm_runtime_get_sync(dev->parent);
+ spin_lock_irq(&dev->power.lock);
+ dev->power.irq_safe = 1;
+ spin_unlock_irq(&dev->power.lock);
+}
+EXPORT_SYMBOL_GPL(pm_runtime_irq_safe);
+
+/**
* update_autosuspend - Handle a change to a device's autosuspend settings.
* @dev: Device to handle.
* @old_delay: The former autosuspend_delay value.
@@ -1199,4 +1244,6 @@ void pm_runtime_remove(struct device *dev)
/* Change the status back to 'suspended' to match the initial status. */
if (dev->power.runtime_status == RPM_ACTIVE)
pm_runtime_set_suspended(dev);
+ if (dev->power.irq_safe && dev->parent)
+ pm_runtime_put_sync(dev->parent);
}
generated by cgit v1.2.3 (git 2.0.4) at 2024-04-26 12:07:39 +0000