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author | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2013-11-19 01:06:49 +0100 |
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committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2013-11-19 01:06:49 +0100 |
commit | 77aa26514a3858cabce748fa093d871b5a51d269 (patch) | |
tree | 6625ffc28c4d1eef7f69818964f4e484e92fd3f2 /Documentation/power/runtime_pm.txt | |
parent | 6431b430973c1c6eb2597da1533764cb4f696526 (diff) | |
parent | aa1b9f13b3346352455bfdc343ecff7667b84ff5 (diff) | |
download | op-kernel-dev-77aa26514a3858cabce748fa093d871b5a51d269.zip op-kernel-dev-77aa26514a3858cabce748fa093d871b5a51d269.tar.gz |
Merge branch 'pm-runtime'
* pm-runtime:
PM / Runtime: Fix error path for prepare
PM / Runtime: Update documentation around probe|remove|suspend
Diffstat (limited to 'Documentation/power/runtime_pm.txt')
-rw-r--r-- | Documentation/power/runtime_pm.txt | 14 |
1 files changed, 6 insertions, 8 deletions
diff --git a/Documentation/power/runtime_pm.txt b/Documentation/power/runtime_pm.txt index 0f54333..b6ce00b 100644 --- a/Documentation/power/runtime_pm.txt +++ b/Documentation/power/runtime_pm.txt @@ -547,13 +547,11 @@ helper functions described in Section 4. In that case, pm_runtime_resume() should be used. Of course, for this purpose the device's runtime PM has to be enabled earlier by calling pm_runtime_enable(). -If the device bus type's or driver's ->probe() callback runs -pm_runtime_suspend() or pm_runtime_idle() or their asynchronous counterparts, -they will fail returning -EAGAIN, because the device's usage counter is -incremented by the driver core before executing ->probe(). Still, it may be -desirable to suspend the device as soon as ->probe() has finished, so the driver -core uses pm_runtime_put_sync() to invoke the subsystem-level idle callback for -the device at that time. +It may be desirable to suspend the device once ->probe() has finished. +Therefore the driver core uses the asyncronous pm_request_idle() to submit a +request to execute the subsystem-level idle callback for the device at that +time. A driver that makes use of the runtime autosuspend feature, may want to +update the last busy mark before returning from ->probe(). Moreover, the driver core prevents runtime PM callbacks from racing with the bus notifier callback in __device_release_driver(), which is necessary, because the @@ -656,7 +654,7 @@ out the following operations: __pm_runtime_disable() with 'false' as the second argument for every device right before executing the subsystem-level .suspend_late() callback for it. - * During system resume it calls pm_runtime_enable() and pm_runtime_put_sync() + * During system resume it calls pm_runtime_enable() and pm_runtime_put() for every device right after executing the subsystem-level .resume_early() callback and right after executing the subsystem-level .resume() callback for it, respectively. |