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| author | Alan Stern <stern@rowland.harvard.edu> | 2015-07-15 15:40:06 +0300 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2015-07-22 00:14:22 +0300 |
| commit | 019d8817b1b064c2bacfbcf40fc68184438ad05a (patch) | |
| tree | f6ac6a9eba69331a3341fa8c85f49d99a912bc41 /Documentation/power/devices.txt | |
| parent | 6ce12a977b7e484540482febe47d1e65f7427abf (diff) | |
| download | linux-019d8817b1b064c2bacfbcf40fc68184438ad05a.tar.xz | |
PM / sleep: Allow devices without runtime PM to do direct-complete
Don't unset the direct_complete flag on devices that have runtime PM
disabled, if they are runtime suspended.
This is needed because otherwise ancestor devices wouldn't be able to
do direct_complete without adding runtime PM support to all its
descendants.
Also removes pm_runtime_suspended_if_enabled() because it's now unused.
Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'Documentation/power/devices.txt')
| -rw-r--r-- | Documentation/power/devices.txt | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/Documentation/power/devices.txt b/Documentation/power/devices.txt index d172bce0fd49..8ba6625fdd63 100644 --- a/Documentation/power/devices.txt +++ b/Documentation/power/devices.txt @@ -341,6 +341,13 @@ the phases are: and is entirely responsible for bringing the device back to the functional state as appropriate. + Note that this direct-complete procedure applies even if the device is + disabled for runtime PM; only the runtime-PM status matters. It follows + that if a device has system-sleep callbacks but does not support runtime + PM, then its prepare callback must never return a positive value. This + is because all devices are initially set to runtime-suspended with + runtime PM disabled. + 2. The suspend methods should quiesce the device to stop it from performing I/O. They also may save the device registers and put it into the appropriate low-power state, depending on the bus type the device is on, |