diff options
Diffstat (limited to 'drivers/base/power/qos.c')
| -rw-r--r-- | drivers/base/power/qos.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/drivers/base/power/qos.c b/drivers/base/power/qos.c index 03f4bd069ca..c5d35883746 100644 --- a/drivers/base/power/qos.c +++ b/drivers/base/power/qos.c @@ -420,3 +420,28 @@ int dev_pm_qos_remove_global_notifier(struct notifier_block *notifier) return blocking_notifier_chain_unregister(&dev_pm_notifiers, notifier); } EXPORT_SYMBOL_GPL(dev_pm_qos_remove_global_notifier); + +/** + * dev_pm_qos_add_ancestor_request - Add PM QoS request for device's ancestor. + * @dev: Device whose ancestor to add the request for. + * @req: Pointer to the preallocated handle. + * @value: Constraint latency value. + */ +int dev_pm_qos_add_ancestor_request(struct device *dev, + struct dev_pm_qos_request *req, s32 value) +{ + struct device *ancestor = dev->parent; + int error = -ENODEV; + + while (ancestor && !ancestor->power.ignore_children) + ancestor = ancestor->parent; + + if (ancestor) + error = dev_pm_qos_add_request(ancestor, req, value); + + if (error) + req->dev = NULL; + + return error; +} +EXPORT_SYMBOL_GPL(dev_pm_qos_add_ancestor_request); |