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PM / Runtime: Update .runtime_idle() callback documentation 

Runtime PM documentation needs to be updated after the previous
change of the rpm_idle() behavior, so modify it as appropriate.

[rjw: Subject and changelog]
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
hifive-unleashed-5.1
Alan Stern 2013-06-03 21:49:59 +02:00 committed by Rafael J. Wysocki
parent 45f0a85c82
commit 43d51af489
1 changed files with 10 additions and 5 deletions
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15
Documentation/power/runtime_pm.txt
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@ -144,8 +144,12 @@ The action performed by the idle callback is totally dependent on the subsystem
(or driver) in question, but the expected and recommended action is to check
if the device can be suspended (i.e. if all of the conditions necessary for
suspending the device are satisfied) and to queue up a suspend request for the
device in that case. The value returned by this callback is ignored by the PM
core.
device in that case. If there is no idle callback, or if the callback returns
0, then the PM core will attempt to carry out a runtime suspend of the device;
in essence, it will call pm_runtime_suspend() directly. To prevent this (for
example, if the callback routine has started a delayed suspend), the routine
should return a non-zero value. Negative error return codes are ignored by the
PM core.
The helper functions provided by the PM core, described in Section 4, guarantee
that the following constraints are met with respect to runtime PM callbacks for
@ -301,9 +305,10 @@ drivers/base/power/runtime.c and include/linux/pm_runtime.h:
removing the device from device hierarchy
int pm_runtime_idle(struct device *dev);
- execute the subsystem-level idle callback for the device; returns 0 on
success or error code on failure, where -EINPROGRESS means that
->runtime_idle() is already being executed
- execute the subsystem-level idle callback for the device; returns an
error code on failure, where -EINPROGRESS means that ->runtime_idle() is
already being executed; if there is no callback or the callback returns 0
then run pm_runtime_suspend(dev) and return its result
int pm_runtime_suspend(struct device *dev);
- execute the subsystem-level suspend callback for the device; returns 0 on