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PM / Runtime: Replace "run-time" with "runtime" in documentation

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The runtime PM documentation and kerneldoc comments sometimes spell
"runtime" with a dash (i.e. "run-time").  Replace all of those
instances with "runtime" to make the naming consistent.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
This commit is contained in:
Rafael J. Wysocki 2011-07-06 10:52:13 +02:00
parent e358bad75f
commit 62052ab1d1
2 changed files with 98 additions and 98 deletions
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130
Documentation/power/runtime_pm.txt
View file

@ -1,39 +1,39 @@
Run-time Power Management Framework for I/O Devices
Runtime Power Management Framework for I/O Devices
(C) 2009-2011 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
(C) 2010 Alan Stern <stern@rowland.harvard.edu>
1. Introduction
Support for run-time power management (run-time PM) of I/O devices is provided
Support for runtime power management (runtime PM) of I/O devices is provided
at the power management core (PM core) level by means of:
* The power management workqueue pm_wq in which bus types and device drivers can
put their PM-related work items. It is strongly recommended that pm_wq be
used for queuing all work items related to run-time PM, because this allows
used for queuing all work items related to runtime PM, because this allows
them to be synchronized with system-wide power transitions (suspend to RAM,
hibernation and resume from system sleep states). pm_wq is declared in
include/linux/pm_runtime.h and defined in kernel/power/main.c.
* A number of run-time PM fields in the 'power' member of 'struct device' (which
* A number of runtime PM fields in the 'power' member of 'struct device' (which
is of the type 'struct dev_pm_info', defined in include/linux/pm.h) that can
be used for synchronizing run-time PM operations with one another.
be used for synchronizing runtime PM operations with one another.
* Three device run-time PM callbacks in 'struct dev_pm_ops' (defined in
* Three device runtime PM callbacks in 'struct dev_pm_ops' (defined in
include/linux/pm.h).
* A set of helper functions defined in drivers/base/power/runtime.c that can be
used for carrying out run-time PM operations in such a way that the
used for carrying out runtime PM operations in such a way that the
synchronization between them is taken care of by the PM core. Bus types and
device drivers are encouraged to use these functions.
The run-time PM callbacks present in 'struct dev_pm_ops', the device run-time PM
The runtime PM callbacks present in 'struct dev_pm_ops', the device runtime PM
fields of 'struct dev_pm_info' and the core helper functions provided for
run-time PM are described below.
runtime PM are described below.
2. Device Run-time PM Callbacks
2. Device Runtime PM Callbacks
There are three device run-time PM callbacks defined in 'struct dev_pm_ops':
There are three device runtime PM callbacks defined in 'struct dev_pm_ops':
struct dev_pm_ops {
...
@ -72,11 +72,11 @@ knows what to do to handle the device).
not mean that the device has been put into a low power state. It is
supposed to mean, however, that the device will not process data and will
not communicate with the CPU(s) and RAM until the subsystem-level resume
callback is executed for it. The run-time PM status of a device after
callback is executed for it. The runtime PM status of a device after
successful execution of the subsystem-level suspend callback is 'suspended'.
* If the subsystem-level suspend callback returns -EBUSY or -EAGAIN,
the device's run-time PM status is 'active', which means that the device
the device's runtime PM status is 'active', which means that the device
_must_ be fully operational afterwards.
* If the subsystem-level suspend callback returns an error code different
@ -104,7 +104,7 @@ the device).
* Once the subsystem-level resume callback has completed successfully, the PM
core regards the device as fully operational, which means that the device
_must_ be able to complete I/O operations as needed. The run-time PM status
_must_ be able to complete I/O operations as needed. The runtime PM status
of the device is then 'active'.
* If the subsystem-level resume callback returns an error code, the PM core
@ -130,7 +130,7 @@ device in that case. The value returned by this callback is 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 the bus type's run-time
that the following constraints are met with respect to the bus type's runtime
PM callbacks:
(1) The callbacks are mutually exclusive (e.g. it is forbidden to execute
@ -142,7 +142,7 @@ PM callbacks:
(2) ->runtime_idle() and ->runtime_suspend() can only be executed for 'active'
devices (i.e. the PM core will only execute ->runtime_idle() or
->runtime_suspend() for the devices the run-time PM status of which is
->runtime_suspend() for the devices the runtime PM status of which is
'active').
(3) ->runtime_idle() and ->runtime_suspend() can only be executed for a device
@ -151,7 +151,7 @@ PM callbacks:
flag of which is set.
(4) ->runtime_resume() can only be executed for 'suspended' devices (i.e. the
PM core will only execute ->runtime_resume() for the devices the run-time
PM core will only execute ->runtime_resume() for the devices the runtime
PM status of which is 'suspended').
Additionally, the helper functions provided by the PM core obey the following
@ -171,9 +171,9 @@ rules:
scheduled requests to execute the other callbacks for the same device,
except for scheduled autosuspends.
3. Run-time PM Device Fields
3. Runtime PM Device Fields
The following device run-time PM fields are present in 'struct dev_pm_info', as
The following device runtime PM fields are present in 'struct dev_pm_info', as
defined in include/linux/pm.h:
struct timer_list suspend_timer;
@ -205,7 +205,7 @@ defined in include/linux/pm.h:
unsigned int disable_depth;
- used for disabling the helper funcions (they work normally if this is
equal to zero); the initial value of it is 1 (i.e. run-time PM is
equal to zero); the initial value of it is 1 (i.e. runtime PM is
initially disabled for all devices)
unsigned int runtime_error;
@ -229,10 +229,10 @@ defined in include/linux/pm.h:
suspend to complete; means "start a resume as soon as you've suspended"
unsigned int run_wake;
- set if the device is capable of generating run-time wake-up events
- set if the device is capable of generating runtime wake-up events
enum rpm_status runtime_status;
- the run-time PM status of the device; this field's initial value is
- the runtime PM status of the device; this field's initial value is
RPM_SUSPENDED, which means that each device is initially regarded by the
PM core as 'suspended', regardless of its real hardware status
@ -243,7 +243,7 @@ defined in include/linux/pm.h:
and pm_runtime_forbid() helper functions
unsigned int no_callbacks;
- indicates that the device does not use the run-time PM callbacks (see
- indicates that the device does not use the runtime PM callbacks (see
Section 8); it may be modified only by the pm_runtime_no_callbacks()
helper function
@ -270,16 +270,16 @@ defined in include/linux/pm.h:
All of the above fields are members of the 'power' member of 'struct device'.
4. Run-time PM Device Helper Functions
4. Runtime PM Device Helper Functions
The following run-time PM helper functions are defined in
The following runtime PM helper functions are defined in
drivers/base/power/runtime.c and include/linux/pm_runtime.h:
void pm_runtime_init(struct device *dev);
- initialize the device run-time PM fields in 'struct dev_pm_info'
- initialize the device runtime PM fields in 'struct dev_pm_info'
void pm_runtime_remove(struct device *dev);
- make sure that the run-time PM of the device will be disabled after
- make sure that the runtime PM of the device will be disabled after
removing the device from device hierarchy
int pm_runtime_idle(struct device *dev);
@ -289,7 +289,7 @@ drivers/base/power/runtime.c and include/linux/pm_runtime.h:
int pm_runtime_suspend(struct device *dev);
- execute the subsystem-level suspend callback for the device; returns 0 on
success, 1 if the device's run-time PM status was already 'suspended', or
success, 1 if the device's runtime PM status was already 'suspended', or
error code on failure, where -EAGAIN or -EBUSY means it is safe to attempt
to suspend the device again in future and -EACCES means that
'power.disable_depth' is different from 0
@ -302,7 +302,7 @@ drivers/base/power/runtime.c and include/linux/pm_runtime.h:
int pm_runtime_resume(struct device *dev);
- execute the subsystem-level resume callback for the device; returns 0 on
success, 1 if the device's run-time PM status was already 'active' or
success, 1 if the device's runtime PM status was already 'active' or
error code on failure, where -EAGAIN means it may be safe to attempt to
resume the device again in future, but 'power.runtime_error' should be
checked additionally, and -EACCES means that 'power.disable_depth' is
@ -323,7 +323,7 @@ drivers/base/power/runtime.c and include/linux/pm_runtime.h:
device in future, where 'delay' is the time to wait before queuing up a
suspend work item in pm_wq, in milliseconds (if 'delay' is zero, the work
item is queued up immediately); returns 0 on success, 1 if the device's PM
run-time status was already 'suspended', or error code if the request
runtime status was already 'suspended', or error code if the request
hasn't been scheduled (or queued up if 'delay' is 0); if the execution of
->runtime_suspend() is already scheduled and not yet expired, the new
value of 'delay' will be used as the time to wait
@ -331,7 +331,7 @@ drivers/base/power/runtime.c and include/linux/pm_runtime.h:
int pm_request_resume(struct device *dev);
- submit a request to execute the subsystem-level resume callback for the
device (the request is represented by a work item in pm_wq); returns 0 on
success, 1 if the device's run-time PM status was already 'active', or
success, 1 if the device's runtime PM status was already 'active', or
error code if the request hasn't been queued up
void pm_runtime_get_noresume(struct device *dev);
@ -370,14 +370,14 @@ drivers/base/power/runtime.c and include/linux/pm_runtime.h:
void pm_runtime_enable(struct device *dev);
- decrement the device's 'power.disable_depth' field; if that field is equal
to zero, the run-time PM helper functions can execute subsystem-level
to zero, the runtime PM helper functions can execute subsystem-level
callbacks described in Section 2 for the device
int pm_runtime_disable(struct device *dev);
- increment the device's 'power.disable_depth' field (if the value of that
field was previously zero, this prevents subsystem-level runtime PM
callbacks from being run for the device), make sure that all of the pending
run-time PM operations on the device are either completed or canceled;
runtime PM operations on the device are either completed or canceled;
returns 1 if there was a resume request pending and it was necessary to
execute the subsystem-level resume callback for the device to satisfy that
request, otherwise 0 is returned
@ -394,7 +394,7 @@ drivers/base/power/runtime.c and include/linux/pm_runtime.h:
- set/unset the power.ignore_children flag of the device
int pm_runtime_set_active(struct device *dev);
- clear the device's 'power.runtime_error' flag, set the device's run-time
- clear the device's 'power.runtime_error' flag, set the device's runtime
PM status to 'active' and update its parent's counter of 'active'
children as appropriate (it is only valid to use this function if
'power.runtime_error' is set or 'power.disable_depth' is greater than
@ -402,7 +402,7 @@ drivers/base/power/runtime.c and include/linux/pm_runtime.h:
which is not active and the 'power.ignore_children' flag of which is unset
void pm_runtime_set_suspended(struct device *dev);
- clear the device's 'power.runtime_error' flag, set the device's run-time
- clear the device's 'power.runtime_error' flag, set the device's runtime
PM status to 'suspended' and update its parent's counter of 'active'
children as appropriate (it is only valid to use this function if
'power.runtime_error' is set or 'power.disable_depth' is greater than
@ -423,7 +423,7 @@ drivers/base/power/runtime.c and include/linux/pm_runtime.h:
effectively prevent the device from being power managed at run time)
void pm_runtime_no_callbacks(struct device *dev);
- set the power.no_callbacks flag for the device and remove the run-time
- set the power.no_callbacks flag for the device and remove the runtime
PM attributes from /sys/devices/.../power (or prevent them from being
added when the device is registered)
@ -443,7 +443,7 @@ drivers/base/power/runtime.c and include/linux/pm_runtime.h:
void pm_runtime_set_autosuspend_delay(struct device *dev, int delay);
- set the power.autosuspend_delay value to 'delay' (expressed in
milliseconds); if 'delay' is negative then run-time suspends are
milliseconds); if 'delay' is negative then runtime suspends are
prevented
unsigned long pm_runtime_autosuspend_expiration(struct device *dev);
@ -482,35 +482,35 @@ pm_runtime_resume()
pm_runtime_get_sync()
pm_runtime_put_sync_suspend()
5. Run-time PM Initialization, Device Probing and Removal
5. Runtime PM Initialization, Device Probing and Removal
Initially, the run-time PM is disabled for all devices, which means that the
majority of the run-time PM helper funtions described in Section 4 will return
Initially, the runtime PM is disabled for all devices, which means that the
majority of the runtime PM helper funtions described in Section 4 will return
-EAGAIN until pm_runtime_enable() is called for the device.
In addition to that, the initial run-time PM status of all devices is
In addition to that, the initial runtime PM status of all devices is
'suspended', but it need not reflect the actual physical state of the device.
Thus, if the device is initially active (i.e. it is able to process I/O), its
run-time PM status must be changed to 'active', with the help of
runtime PM status must be changed to 'active', with the help of
pm_runtime_set_active(), before pm_runtime_enable() is called for the device.
However, if the device has a parent and the parent's run-time PM is enabled,
However, if the device has a parent and the parent's runtime PM is enabled,
calling pm_runtime_set_active() for the device will affect the parent, unless
the parent's 'power.ignore_children' flag is set. Namely, in that case the
parent won't be able to suspend at run time, using the PM core's helper
functions, as long as the child's status is 'active', even if the child's
run-time PM is still disabled (i.e. pm_runtime_enable() hasn't been called for
runtime PM is still disabled (i.e. pm_runtime_enable() hasn't been called for
the child yet or pm_runtime_disable() has been called for it). For this reason,
once pm_runtime_set_active() has been called for the device, pm_runtime_enable()
should be called for it too as soon as reasonably possible or its run-time PM
should be called for it too as soon as reasonably possible or its runtime PM
status should be changed back to 'suspended' with the help of
pm_runtime_set_suspended().
If the default initial run-time PM status of the device (i.e. 'suspended')
If the default initial runtime PM status of the device (i.e. 'suspended')
reflects the actual state of the device, its bus type's or its driver's
->probe() callback will likely need to wake it up using one of the PM core's
helper functions described in Section 4. In that case, pm_runtime_resume()
should be used. Of course, for this purpose the device's run-time PM has to be
should be used. Of course, for this purpose the device's runtime PM has to be
enabled earlier by calling pm_runtime_enable().
If the device bus type's or driver's ->probe() callback runs
@ -541,29 +541,29 @@ The user space can effectively disallow the driver of the device to power manage
it at run time by changing the value of its /sys/devices/.../power/control
attribute to "on", which causes pm_runtime_forbid() to be called. In principle,
this mechanism may also be used by the driver to effectively turn off the
run-time power management of the device until the user space turns it on.
Namely, during the initialization the driver can make sure that the run-time PM
runtime power management of the device until the user space turns it on.
Namely, during the initialization the driver can make sure that the runtime PM
status of the device is 'active' and call pm_runtime_forbid(). It should be
noted, however, that if the user space has already intentionally changed the
value of /sys/devices/.../power/control to "auto" to allow the driver to power
manage the device at run time, the driver may confuse it by using
pm_runtime_forbid() this way.
6. Run-time PM and System Sleep
6. Runtime PM and System Sleep
Run-time PM and system sleep (i.e., system suspend and hibernation, also known
Runtime PM and system sleep (i.e., system suspend and hibernation, also known
as suspend-to-RAM and suspend-to-disk) interact with each other in a couple of
ways. If a device is active when a system sleep starts, everything is
straightforward. But what should happen if the device is already suspended?
The device may have different wake-up settings for run-time PM and system sleep.
For example, remote wake-up may be enabled for run-time suspend but disallowed
The device may have different wake-up settings for runtime PM and system sleep.
For example, remote wake-up may be enabled for runtime suspend but disallowed
for system sleep (device_may_wakeup(dev) returns 'false'). When this happens,
the subsystem-level system suspend callback is responsible for changing the
device's wake-up setting (it may leave that to the device driver's system
suspend routine). It may be necessary to resume the device and suspend it again
in order to do so. The same is true if the driver uses different power levels
or other settings for run-time suspend and system sleep.
or other settings for runtime suspend and system sleep.
During system resume, the simplest approach is to bring all devices back to full
power, even if they had been suspended before the system suspend began. There
@ -582,10 +582,10 @@ are several reasons for this, including:
* The device might need to be reset.
* Even though the device was suspended, if its usage counter was > 0 then most
likely it would need a run-time resume in the near future anyway.
likely it would need a runtime resume in the near future anyway.
If the device had been suspended before the system suspend began and it's
brought back to full power during resume, then its run-time PM status will have
brought back to full power during resume, then its runtime PM status will have
to be updated to reflect the actual post-system sleep status. The way to do
this is:
@ -593,9 +593,9 @@ this is:
pm_runtime_set_active(dev);
pm_runtime_enable(dev);
The PM core always increments the run-time usage counter before calling the
The PM core always increments the runtime usage counter before calling the
->suspend() callback and decrements it after calling the ->resume() callback.
Hence disabling run-time PM temporarily like this will not cause any runtime
Hence disabling runtime PM temporarily like this will not cause any runtime
suspend attempts to be permanently lost. If the usage count goes to zero
following the return of the ->resume() callback, the ->runtime_idle() callback
will be invoked as usual.
@ -710,8 +710,8 @@ the GENERIC_SUBSYS_PM_OPS macro, defined in include/linux/pm.h, to its
dev_pm_ops structure pointer.
Device drivers that wish to use the same function as a system suspend, freeze,
poweroff and run-time suspend callback, and similarly for system resume, thaw,
restore, and run-time resume, can achieve this with the help of the
poweroff and runtime suspend callback, and similarly for system resume, thaw,
restore, and runtime resume, can achieve this with the help of the
UNIVERSAL_DEV_PM_OPS macro defined in include/linux/pm.h (possibly setting its
last argument to NULL).
@ -721,7 +721,7 @@ Some "devices" are only logical sub-devices of their parent and cannot be
power-managed on their own. (The prototype example is a USB interface. Entire
USB devices can go into low-power mode or send wake-up requests, but neither is
possible for individual interfaces.) The drivers for these devices have no
need of run-time PM callbacks; if the callbacks did exist, ->runtime_suspend()
need of runtime PM callbacks; if the callbacks did exist, ->runtime_suspend()
and ->runtime_resume() would always return 0 without doing anything else and
->runtime_idle() would always call pm_runtime_suspend().
@ -729,7 +729,7 @@ Subsystems can tell the PM core about these devices by calling
pm_runtime_no_callbacks(). This should be done after the device structure is
initialized and before it is registered (although after device registration is
also okay). The routine will set the device's power.no_callbacks flag and
prevent the non-debugging run-time PM sysfs attributes from being created.
prevent the non-debugging runtime PM sysfs attributes from being created.
When power.no_callbacks is set, the PM core will not invoke the
->runtime_idle(), ->runtime_suspend(), or ->runtime_resume() callbacks.
@ -737,7 +737,7 @@ Instead it will assume that suspends and resumes always succeed and that idle
devices should be suspended.
As a consequence, the PM core will never directly inform the device's subsystem
or driver about run-time power changes. Instead, the driver for the device's
or driver about runtime power changes. Instead, the driver for the device's
parent must take responsibility for telling the device's driver when the
parent's power state changes.
@ -748,13 +748,13 @@ A device should be put in a low-power state only when there's some reason to
think it will remain in that state for a substantial time. A common heuristic
says that a device which hasn't been used for a while is liable to remain
unused; following this advice, drivers should not allow devices to be suspended
at run-time until they have been inactive for some minimum period. Even when
at runtime until they have been inactive for some minimum period. Even when
the heuristic ends up being non-optimal, it will still prevent devices from
"bouncing" too rapidly between low-power and full-power states.
The term "autosuspend" is an historical remnant. It doesn't mean that the
device is automatically suspended (the subsystem or driver still has to call
the appropriate PM routines); rather it means that run-time suspends will
the appropriate PM routines); rather it means that runtime suspends will
automatically be delayed until the desired period of inactivity has elapsed.
Inactivity is determined based on the power.last_busy field. Drivers should

66
drivers/base/power/runtime.c
View file

@ -1,5 +1,5 @@
/*
* drivers/base/power/runtime.c - Helper functions for device run-time PM
* drivers/base/power/runtime.c - Helper functions for device runtime PM
*
* Copyright (c) 2009 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
* Copyright (C) 2010 Alan Stern <stern@rowland.harvard.edu>
@ -159,7 +159,7 @@ static int rpm_check_suspend_allowed(struct device *dev)
* @dev: Device to notify the bus type about.
* @rpmflags: Flag bits.
*
* Check if the device's run-time PM status allows it to be suspended. If
* Check if the device's runtime PM status allows it to be suspended. If
* another idle notification has been started earlier, return immediately. If
* the RPM_ASYNC flag is set then queue an idle-notification request; otherwise
* run the ->runtime_idle() callback directly.
@ -267,11 +267,11 @@ static int rpm_callback(int (*cb)(struct device *), struct device *dev)
}
/**
* rpm_suspend - Carry out run-time suspend of given device.
* rpm_suspend - Carry out runtime suspend of given device.
* @dev: Device to suspend.
* @rpmflags: Flag bits.
*
* Check if the device's run-time PM status allows it to be suspended. If
* Check if the device's runtime PM status allows it to be suspended. If
* another suspend has been started earlier, either return immediately or wait
* for it to finish, depending on the RPM_NOWAIT and RPM_ASYNC flags. Cancel a
* pending idle notification. If the RPM_ASYNC flag is set then queue a
@ -430,11 +430,11 @@ static int rpm_suspend(struct device *dev, int rpmflags)
}
/**
* rpm_resume - Carry out run-time resume of given device.
* rpm_resume - Carry out runtime resume of given device.
* @dev: Device to resume.
* @rpmflags: Flag bits.
*
* Check if the device's run-time PM status allows it to be resumed. Cancel
* Check if the device's runtime PM status allows it to be resumed. Cancel
* any scheduled or pending requests. If another resume has been started
* earlier, either return immediately or wait for it to finish, depending on the
* RPM_NOWAIT and RPM_ASYNC flags. Similarly, if there's a suspend running in
@ -551,7 +551,7 @@ static int rpm_resume(struct device *dev, int rpmflags)
spin_lock(&parent->power.lock);
/*
* We can resume if the parent's run-time PM is disabled or it
* We can resume if the parent's runtime PM is disabled or it
* is set to ignore children.
*/
if (!parent->power.disable_depth
@ -615,11 +615,11 @@ static int rpm_resume(struct device *dev, int rpmflags)
}
/**
* pm_runtime_work - Universal run-time PM work function.
* pm_runtime_work - Universal runtime PM work function.
* @work: Work structure used for scheduling the execution of this function.
*
* Use @work to get the device object the work is to be done for, determine what
* is to be done and execute the appropriate run-time PM function.
* is to be done and execute the appropriate runtime PM function.
*/
static void pm_runtime_work(struct work_struct *work)
{
@ -718,7 +718,7 @@ int pm_schedule_suspend(struct device *dev, unsigned int delay)
EXPORT_SYMBOL_GPL(pm_schedule_suspend);
/**
* __pm_runtime_idle - Entry point for run-time idle operations.
* __pm_runtime_idle - Entry point for runtime idle operations.
* @dev: Device to send idle notification for.
* @rpmflags: Flag bits.
*
@ -747,7 +747,7 @@ int __pm_runtime_idle(struct device *dev, int rpmflags)
EXPORT_SYMBOL_GPL(__pm_runtime_idle);
/**
* __pm_runtime_suspend - Entry point for run-time put/suspend operations.
* __pm_runtime_suspend - Entry point for runtime put/suspend operations.
* @dev: Device to suspend.
* @rpmflags: Flag bits.
*
@ -776,7 +776,7 @@ int __pm_runtime_suspend(struct device *dev, int rpmflags)
EXPORT_SYMBOL_GPL(__pm_runtime_suspend);
/**
* __pm_runtime_resume - Entry point for run-time resume operations.
* __pm_runtime_resume - Entry point for runtime resume operations.
* @dev: Device to resume.
* @rpmflags: Flag bits.
*
@ -802,11 +802,11 @@ int __pm_runtime_resume(struct device *dev, int rpmflags)
EXPORT_SYMBOL_GPL(__pm_runtime_resume);
/**
* __pm_runtime_set_status - Set run-time PM status of a device.
* __pm_runtime_set_status - Set runtime PM status of a device.
* @dev: Device to handle.
* @status: New run-time PM status of the device.
* @status: New runtime PM status of the device.
*
* If run-time PM of the device is disabled or its power.runtime_error field is
* If runtime PM of the device is disabled or its power.runtime_error field is
* different from zero, the status may be changed either to RPM_ACTIVE, or to
* RPM_SUSPENDED, as long as that reflects the actual state of the device.
* However, if the device has a parent and the parent is not active, and the
@ -852,7 +852,7 @@ int __pm_runtime_set_status(struct device *dev, unsigned int status)
/*
* It is invalid to put an active child under a parent that is
* not active, has run-time PM enabled and the
* not active, has runtime PM enabled and the
* 'power.ignore_children' flag unset.
*/
if (!parent->power.disable_depth
@ -886,7 +886,7 @@ EXPORT_SYMBOL_GPL(__pm_runtime_set_status);
* @dev: Device to handle.
*
* Flush all pending requests for the device from pm_wq and wait for all
* run-time PM operations involving the device in progress to complete.
* runtime PM operations involving the device in progress to complete.
*
* Should be called under dev->power.lock with interrupts disabled.
*/
@ -934,7 +934,7 @@ static void __pm_runtime_barrier(struct device *dev)
* Prevent the device from being suspended by incrementing its usage counter and
* if there's a pending resume request for the device, wake the device up.
* Next, make sure that all pending requests for the device have been flushed
* from pm_wq and wait for all run-time PM operations involving the device in
* from pm_wq and wait for all runtime PM operations involving the device in
* progress to complete.
*
* Return value:
@ -964,18 +964,18 @@ int pm_runtime_barrier(struct device *dev)
EXPORT_SYMBOL_GPL(pm_runtime_barrier);
/**
* __pm_runtime_disable - Disable run-time PM of a device.
* __pm_runtime_disable - Disable runtime PM of a device.
* @dev: Device to handle.
* @check_resume: If set, check if there's a resume request for the device.
*
* Increment power.disable_depth for the device and if was zero previously,
* cancel all pending run-time PM requests for the device and wait for all
* cancel all pending runtime PM requests for the device and wait for all
* operations in progress to complete. The device can be either active or
* suspended after its run-time PM has been disabled.
* suspended after its runtime PM has been disabled.
*
* If @check_resume is set and there's a resume request pending when
* __pm_runtime_disable() is called and power.disable_depth is zero, the
* function will wake up the device before disabling its run-time PM.
* function will wake up the device before disabling its runtime PM.
*/
void __pm_runtime_disable(struct device *dev, bool check_resume)
{
@ -988,7 +988,7 @@ void __pm_runtime_disable(struct device *dev, bool check_resume)
/*
* Wake up the device if there's a resume request pending, because that
* means there probably is some I/O to process and disabling run-time PM
* means there probably is some I/O to process and disabling runtime PM
* shouldn't prevent the device from processing the I/O.
*/
if (check_resume && dev->power.request_pending
@ -1013,7 +1013,7 @@ void __pm_runtime_disable(struct device *dev, bool check_resume)
EXPORT_SYMBOL_GPL(__pm_runtime_disable);
/**
* pm_runtime_enable - Enable run-time PM of a device.
* pm_runtime_enable - Enable runtime PM of a device.
* @dev: Device to handle.
*/
void pm_runtime_enable(struct device *dev)
@ -1032,7 +1032,7 @@ void pm_runtime_enable(struct device *dev)
EXPORT_SYMBOL_GPL(pm_runtime_enable);
/**
* pm_runtime_forbid - Block run-time PM of a device.
* pm_runtime_forbid - Block runtime PM of a device.
* @dev: Device to handle.
*
* Increase the device's usage count and clear its power.runtime_auto flag,
@ -1055,7 +1055,7 @@ void pm_runtime_forbid(struct device *dev)
EXPORT_SYMBOL_GPL(pm_runtime_forbid);
/**
* pm_runtime_allow - Unblock run-time PM of a device.
* pm_runtime_allow - Unblock runtime PM of a device.
* @dev: Device to handle.
*
* Decrease the device's usage count and set its power.runtime_auto flag.
@ -1076,12 +1076,12 @@ void pm_runtime_allow(struct device *dev)
EXPORT_SYMBOL_GPL(pm_runtime_allow);
/**
* pm_runtime_no_callbacks - Ignore run-time PM callbacks for a device.
* pm_runtime_no_callbacks - Ignore runtime PM callbacks for a device.
* @dev: Device to handle.
*
* Set the power.no_callbacks flag, which tells the PM core that this
* device is power-managed through its parent and has no run-time PM
* callbacks of its own. The run-time sysfs attributes will be removed.
* device is power-managed through its parent and has no runtime PM
* callbacks of its own. The runtime sysfs attributes will be removed.
*/
void pm_runtime_no_callbacks(struct device *dev)
{
@ -1157,8 +1157,8 @@ static void update_autosuspend(struct device *dev, int old_delay, int old_use)
* @delay: Value of the new delay in milliseconds.
*
* Set the device's power.autosuspend_delay value. If it changes to negative
* and the power.use_autosuspend flag is set, prevent run-time suspends. If it
* changes the other way, allow run-time suspends.
* and the power.use_autosuspend flag is set, prevent runtime suspends. If it
* changes the other way, allow runtime suspends.
*/
void pm_runtime_set_autosuspend_delay(struct device *dev, int delay)
{
@ -1178,7 +1178,7 @@ EXPORT_SYMBOL_GPL(pm_runtime_set_autosuspend_delay);
* @dev: Device to handle.
* @use: New value for use_autosuspend.
*
* Set the device's power.use_autosuspend flag, and allow or prevent run-time
* Set the device's power.use_autosuspend flag, and allow or prevent runtime
* suspends as needed.
*/
void __pm_runtime_use_autosuspend(struct device *dev, bool use)
@ -1195,7 +1195,7 @@ void __pm_runtime_use_autosuspend(struct device *dev, bool use)
EXPORT_SYMBOL_GPL(__pm_runtime_use_autosuspend);
/**
* pm_runtime_init - Initialize run-time PM fields in given device object.
* pm_runtime_init - Initialize runtime PM fields in given device object.
* @dev: Device object to initialize.
*/
void pm_runtime_init(struct device *dev)