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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>
This commit is contained in:
Alan Stern 2015-07-15 14:40:06 +02:00 committed by Rafael J. Wysocki
parent 6ce12a977b
commit 019d8817b1
4 changed files with 8 additions and 11 deletions
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7
Documentation/power/devices.txt
View File

@ -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,

4
Documentation/power/runtime_pm.txt
View File

@ -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

2
drivers/base/power/main.c
View File

@ -1377,7 +1377,7 @@ static int __device_suspend(struct device *dev, pm_message_t state, bool async)
if (dev->power.direct_complete) {
if (pm_runtime_status_suspended(dev)) {
pm_runtime_disable(dev);
if (pm_runtime_suspended_if_enabled(dev))
if (pm_runtime_status_suspended(dev))
goto Complete;
pm_runtime_enable(dev);

6
include/linux/pm_runtime.h
View File

@ -98,11 +98,6 @@ static inline bool pm_runtime_status_suspended(struct device *dev)
return dev->power.runtime_status == RPM_SUSPENDED;
}
static inline bool pm_runtime_suspended_if_enabled(struct device *dev)
{
return pm_runtime_status_suspended(dev) && dev->power.disable_depth == 1;
}
static inline bool pm_runtime_enabled(struct device *dev)
{
return !dev->power.disable_depth;
@ -164,7 +159,6 @@ static inline void device_set_run_wake(struct device *dev, bool enable) {}
static inline bool pm_runtime_suspended(struct device *dev) { return false; }
static inline bool pm_runtime_active(struct device *dev) { return true; }
static inline bool pm_runtime_status_suspended(struct device *dev) { return false; }
static inline bool pm_runtime_suspended_if_enabled(struct device *dev) { return false; }
static inline bool pm_runtime_enabled(struct device *dev) { return false; }
static inline void pm_runtime_no_callbacks(struct device *dev) {}