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| author | Alan Stern <stern@rowland.harvard.edu> | 2015-07-15 14:40:06 +0200 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2015-07-21 23:14:22 +0200 |
| commit | 019d8817b1b064c2bacfbcf40fc68184438ad05a (patch) | |
| tree | f6ac6a9eba69331a3341fa8c85f49d99a912bc41 /Documentation/power | |
| parent | 6ce12a977b7e484540482febe47d1e65f7427abf (diff) | |
| download | linux-019d8817b1b064c2bacfbcf40fc68184438ad05a.tar.gz linux-019d8817b1b064c2bacfbcf40fc68184438ad05a.tar.bz2 linux-019d8817b1b064c2bacfbcf40fc68184438ad05a.zip | |
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')
| -rw-r--r-- | Documentation/power/devices.txt | 7 | ||||
| -rw-r--r-- | Documentation/power/runtime_pm.txt | 4 |
2 files changed, 7 insertions, 4 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, diff --git a/Documentation/power/runtime_pm.txt b/Documentation/power/runtime_pm.txt index e76dc0ad4d2b..0784bc3a2ab5 100644 --- a/Documentation/power/runtime_pm.txt +++ b/Documentation/power/runtime_pm.txt @@ -445,10 +445,6 @@ drivers/base/power/runtime.c and include/linux/pm_runtime.h: bool pm_runtime_status_suspended(struct device *dev); - return true if the device's runtime PM status is 'suspended' - bool pm_runtime_suspended_if_enabled(struct device *dev); - - return true if the device's runtime PM status is 'suspended' and its - 'power.disable_depth' field is equal to 1 - void pm_runtime_allow(struct device *dev); - set the power.runtime_auto flag for the device and decrease its usage counter (used by the /sys/devices/.../power/control interface to |