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| author | Johan Hovold <johan@kernel.org> | 2017-04-10 13:38:24 +0200 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2017-04-19 23:29:17 +0200 |
| commit | 72ec2e17f9f7f7f6082ec57183080726eb3523e3 (patch) | |
| tree | c1975c248e1473bf1b7d82295eb2697adb2d2e62 /Documentation/power | |
| parent | Linux 4.11-rc7 (diff) | |
| download | linux-72ec2e17f9f7f7f6082ec57183080726eb3523e3.tar.xz linux-72ec2e17f9f7f7f6082ec57183080726eb3523e3.zip | |
PM / runtime: Fix autosuspend documentation
Update the autosuspend documentation which claimed that the autosuspend
delay is not taken into account when using the non-autosuspend helper
functions, something which is no longer true since commit d66e6db28df3
("PM / Runtime: Respect autosuspend when idle triggers suspend").
This specifically means that drivers must now disable autosuspend before
disabling runtime pm in probe error paths and remove callbacks if
pm_runtime_put_sync was being used to suspend the device before
returning. (If an idle callback can prevent suspend,
pm_runtime_put_sync_suspend must be used instead of pm_runtime_put_sync
as before.)
Also remove the claim that the autosuspend helpers behave "just like
the non-autosuspend counterparts", something which have never really
been true as some of the latter use idle notifications.
Signed-off-by: Johan Hovold <johan@kernel.org>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'Documentation/power')
| -rw-r--r-- | Documentation/power/runtime_pm.txt | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/Documentation/power/runtime_pm.txt b/Documentation/power/runtime_pm.txt index 64546eb9a16a..56a13b865927 100644 --- a/Documentation/power/runtime_pm.txt +++ b/Documentation/power/runtime_pm.txt @@ -836,9 +836,8 @@ of the non-autosuspend counterparts: Instead of: pm_runtime_put_sync use: pm_runtime_put_sync_autosuspend. Drivers may also continue to use the non-autosuspend helper functions; they -will behave normally, not taking the autosuspend delay into account. -Similarly, if the power.use_autosuspend field isn't set then the autosuspend -helper functions will behave just like the non-autosuspend counterparts. +will behave normally, which means sometimes taking the autosuspend delay into +account (see pm_runtime_idle). Under some circumstances a driver or subsystem may want to prevent a device from autosuspending immediately, even though the usage counter is zero and the |