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-rw-r--r--Documentation/power/devices.txt29
-rw-r--r--Documentation/power/runtime_pm.txt13
-rw-r--r--drivers/base/power/main.c150
-rw-r--r--drivers/base/power/runtime.c18
4 files changed, 92 insertions, 118 deletions
diff --git a/Documentation/power/devices.txt b/Documentation/power/devices.txt
index df1a5cb10c42..f023ba6bba62 100644
--- a/Documentation/power/devices.txt
+++ b/Documentation/power/devices.txt
@@ -249,23 +249,18 @@ various phases always run after tasks have been frozen and before they are
unfrozen. Furthermore, the *_noirq phases run at a time when IRQ handlers have
been disabled (except for those marked with the IRQ_WAKEUP flag).
-Most phases use bus, type, and class callbacks (that is, methods defined in
-dev->bus->pm, dev->type->pm, and dev->class->pm). The prepare and complete
-phases are exceptions; they use only bus callbacks. When multiple callbacks
-are used in a phase, they are invoked in the order: <class, type, bus> during
-power-down transitions and in the opposite order during power-up transitions.
-For example, during the suspend phase the PM core invokes
-
- dev->class->pm.suspend(dev);
- dev->type->pm.suspend(dev);
- dev->bus->pm.suspend(dev);
-
-before moving on to the next device, whereas during the resume phase the core
-invokes
-
- dev->bus->pm.resume(dev);
- dev->type->pm.resume(dev);
- dev->class->pm.resume(dev);
+All phases use bus, type, or class callbacks (that is, methods defined in
+dev->bus->pm, dev->type->pm, or dev->class->pm). These callbacks are mutually
+exclusive, so if the device type provides a struct dev_pm_ops object pointed to
+by its pm field (i.e. both dev->type and dev->type->pm are defined), the
+callbacks included in that object (i.e. dev->type->pm) will be used. Otherwise,
+if the class provides a struct dev_pm_ops object pointed to by its pm field
+(i.e. both dev->class and dev->class->pm are defined), the PM core will use the
+callbacks from that object (i.e. dev->class->pm). Finally, if the pm fields of
+both the device type and class objects are NULL (or those objects do not exist),
+the callbacks provided by the bus (that is, the callbacks from dev->bus->pm)
+will be used (this allows device types to override callbacks provided by bus
+types or classes if necessary).
These callbacks may in turn invoke device- or driver-specific methods stored in
dev->driver->pm, but they don't have to.
diff --git a/Documentation/power/runtime_pm.txt b/Documentation/power/runtime_pm.txt
index ffe55ffa540a..654097b130b4 100644
--- a/Documentation/power/runtime_pm.txt
+++ b/Documentation/power/runtime_pm.txt
@@ -1,6 +1,6 @@
Run-time Power Management Framework for I/O Devices
-(C) 2009 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
+(C) 2009-2011 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
(C) 2010 Alan Stern <stern@rowland.harvard.edu>
1. Introduction
@@ -44,11 +44,12 @@ struct dev_pm_ops {
};
The ->runtime_suspend(), ->runtime_resume() and ->runtime_idle() callbacks are
-executed by the PM core for either the bus type, or device type (if the bus
-type's callback is not defined), or device class (if the bus type's and device
-type's callbacks are not defined) of given device. The bus type, device type
-and device class callbacks are referred to as subsystem-level callbacks in what
-follows.
+executed by the PM core for either the device type, or the class (if the device
+type's struct dev_pm_ops object does not exist), or the bus type (if the
+device type's and class' struct dev_pm_ops objects do not exist) of the given
+device (this allows device types to override callbacks provided by bus types or
+classes if necessary). The bus type, device type and class callbacks are
+referred to as subsystem-level callbacks in what follows.
By default, the callbacks are always invoked in process context with interrupts
enabled. However, subsystems can use the pm_runtime_irq_safe() helper function
diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
index 05b989139b54..052dc53eef38 100644
--- a/drivers/base/power/main.c
+++ b/drivers/base/power/main.c
@@ -428,26 +428,17 @@ static int device_resume_noirq(struct device *dev, pm_message_t state)
pm_noirq_op(dev, &dev->pwr_domain->ops, state);
}
- if (dev->bus && dev->bus->pm) {
- pm_dev_dbg(dev, state, "EARLY ");
- error = pm_noirq_op(dev, dev->bus->pm, state);
- if (error)
- goto End;
- }
-
if (dev->type && dev->type->pm) {
pm_dev_dbg(dev, state, "EARLY type ");
error = pm_noirq_op(dev, dev->type->pm, state);
- if (error)
- goto End;
- }
-
- if (dev->class && dev->class->pm) {
+ } else if (dev->class && dev->class->pm) {
pm_dev_dbg(dev, state, "EARLY class ");
error = pm_noirq_op(dev, dev->class->pm, state);
+ } else if (dev->bus && dev->bus->pm) {
+ pm_dev_dbg(dev, state, "EARLY ");
+ error = pm_noirq_op(dev, dev->bus->pm, state);
}
-End:
TRACE_RESUME(error);
return error;
}
@@ -528,36 +519,34 @@ static int device_resume(struct device *dev, pm_message_t state, bool async)
pm_op(dev, &dev->pwr_domain->ops, state);
}
- if (dev->bus) {
- if (dev->bus->pm) {
- pm_dev_dbg(dev, state, "");
- error = pm_op(dev, dev->bus->pm, state);
- } else if (dev->bus->resume) {
- pm_dev_dbg(dev, state, "legacy ");
- error = legacy_resume(dev, dev->bus->resume);
- }
- if (error)
- goto End;
- }
-
- if (dev->type) {
- if (dev->type->pm) {
- pm_dev_dbg(dev, state, "type ");
- error = pm_op(dev, dev->type->pm, state);
- }
- if (error)
- goto End;
+ if (dev->type && dev->type->pm) {
+ pm_dev_dbg(dev, state, "type ");
+ error = pm_op(dev, dev->type->pm, state);
+ goto End;
}
if (dev->class) {
if (dev->class->pm) {
pm_dev_dbg(dev, state, "class ");
error = pm_op(dev, dev->class->pm, state);
+ goto End;
} else if (dev->class->resume) {
pm_dev_dbg(dev, state, "legacy class ");
error = legacy_resume(dev, dev->class->resume);
+ goto End;
}
}
+
+ if (dev->bus) {
+ if (dev->bus->pm) {
+ pm_dev_dbg(dev, state, "");
+ error = pm_op(dev, dev->bus->pm, state);
+ } else if (dev->bus->resume) {
+ pm_dev_dbg(dev, state, "legacy ");
+ error = legacy_resume(dev, dev->bus->resume);
+ }
+ }
+
End:
device_unlock(dev);
complete_all(&dev->power.completion);
@@ -644,19 +633,18 @@ static void device_complete(struct device *dev, pm_message_t state)
dev->pwr_domain->ops.complete(dev);
}
- if (dev->class && dev->class->pm && dev->class->pm->complete) {
- pm_dev_dbg(dev, state, "completing class ");
- dev->class->pm->complete(dev);
- }
-
- if (dev->type && dev->type->pm && dev->type->pm->complete) {
+ if (dev->type && dev->type->pm) {
pm_dev_dbg(dev, state, "completing type ");
- dev->type->pm->complete(dev);
- }
-
- if (dev->bus && dev->bus->pm && dev->bus->pm->complete) {
+ if (dev->type->pm->complete)
+ dev->type->pm->complete(dev);
+ } else if (dev->class && dev->class->pm) {
+ pm_dev_dbg(dev, state, "completing class ");
+ if (dev->class->pm->complete)
+ dev->class->pm->complete(dev);
+ } else if (dev->bus && dev->bus->pm) {
pm_dev_dbg(dev, state, "completing ");
- dev->bus->pm->complete(dev);
+ if (dev->bus->pm->complete)
+ dev->bus->pm->complete(dev);
}
device_unlock(dev);
@@ -741,27 +729,23 @@ static pm_message_t resume_event(pm_message_t sleep_state)
*/
static int device_suspend_noirq(struct device *dev, pm_message_t state)
{
- int error = 0;
-
- if (dev->class && dev->class->pm) {
- pm_dev_dbg(dev, state, "LATE class ");
- error = pm_noirq_op(dev, dev->class->pm, state);
- if (error)
- goto End;
- }
+ int error;
if (dev->type && dev->type->pm) {
pm_dev_dbg(dev, state, "LATE type ");
error = pm_noirq_op(dev, dev->type->pm, state);
if (error)
- goto End;
- }
-
- if (dev->bus && dev->bus->pm) {
+ return error;
+ } else if (dev->class && dev->class->pm) {
+ pm_dev_dbg(dev, state, "LATE class ");
+ error = pm_noirq_op(dev, dev->class->pm, state);
+ if (error)
+ return error;
+ } else if (dev->bus && dev->bus->pm) {
pm_dev_dbg(dev, state, "LATE ");
error = pm_noirq_op(dev, dev->bus->pm, state);
if (error)
- goto End;
+ return error;
}
if (dev->pwr_domain) {
@@ -769,8 +753,7 @@ static int device_suspend_noirq(struct device *dev, pm_message_t state)
pm_noirq_op(dev, &dev->pwr_domain->ops, state);
}
-End:
- return error;
+ return 0;
}
/**
@@ -857,25 +840,22 @@ static int __device_suspend(struct device *dev, pm_message_t state, bool async)
goto End;
}
+ if (dev->type && dev->type->pm) {
+ pm_dev_dbg(dev, state, "type ");
+ error = pm_op(dev, dev->type->pm, state);
+ goto Domain;
+ }
+
if (dev->class) {
if (dev->class->pm) {
pm_dev_dbg(dev, state, "class ");
error = pm_op(dev, dev->class->pm, state);
+ goto Domain;
} else if (dev->class->suspend) {
pm_dev_dbg(dev, state, "legacy class ");
error = legacy_suspend(dev, state, dev->class->suspend);
+ goto Domain;
}
- if (error)
- goto End;
- }
-
- if (dev->type) {
- if (dev->type->pm) {
- pm_dev_dbg(dev, state, "type ");
- error = pm_op(dev, dev->type->pm, state);
- }
- if (error)
- goto End;
}
if (dev->bus) {
@@ -886,11 +866,10 @@ static int __device_suspend(struct device *dev, pm_message_t state, bool async)
pm_dev_dbg(dev, state, "legacy ");
error = legacy_suspend(dev, state, dev->bus->suspend);
}
- if (error)
- goto End;
}
- if (dev->pwr_domain) {
+ Domain:
+ if (!error && dev->pwr_domain) {
pm_dev_dbg(dev, state, "power domain ");
pm_op(dev, &dev->pwr_domain->ops, state);
}
@@ -985,28 +964,27 @@ static int device_prepare(struct device *dev, pm_message_t state)
device_lock(dev);
- if (dev->bus && dev->bus->pm && dev->bus->pm->prepare) {
- pm_dev_dbg(dev, state, "preparing ");
- error = dev->bus->pm->prepare(dev);
- suspend_report_result(dev->bus->pm->prepare, error);
- if (error)
- goto End;
- }
-
- if (dev->type && dev->type->pm && dev->type->pm->prepare) {
+ if (dev->type && dev->type->pm) {
pm_dev_dbg(dev, state, "preparing type ");
- error = dev->type->pm->prepare(dev);
+ if (dev->type->pm->prepare)
+ error = dev->type->pm->prepare(dev);
suspend_report_result(dev->type->pm->prepare, error);
if (error)
goto End;
- }
-
- if (dev->class && dev->class->pm && dev->class->pm->prepare) {
+ } else if (dev->class && dev->class->pm) {
pm_dev_dbg(dev, state, "preparing class ");
- error = dev->class->pm->prepare(dev);
+ if (dev->class->pm->prepare)
+ error = dev->class->pm->prepare(dev);
suspend_report_result(dev->class->pm->prepare, error);
if (error)
goto End;
+ } else if (dev->bus && dev->bus->pm) {
+ pm_dev_dbg(dev, state, "preparing ");
+ if (dev->bus->pm->prepare)
+ error = dev->bus->pm->prepare(dev);
+ suspend_report_result(dev->bus->pm->prepare, error);
+ if (error)
+ goto End;
}
if (dev->pwr_domain && dev->pwr_domain->ops.prepare) {
diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
index 25edc9a3a489..54597c859ecb 100644
--- a/drivers/base/power/runtime.c
+++ b/drivers/base/power/runtime.c
@@ -214,12 +214,12 @@ static int rpm_idle(struct device *dev, int rpmflags)
dev->power.idle_notification = true;
- if (dev->bus && dev->bus->pm && dev->bus->pm->runtime_idle)
- callback = dev->bus->pm->runtime_idle;
- else if (dev->type && dev->type->pm && dev->type->pm->runtime_idle)
+ if (dev->type && dev->type->pm)
callback = dev->type->pm->runtime_idle;
else if (dev->class && dev->class->pm)
callback = dev->class->pm->runtime_idle;
+ else if (dev->bus && dev->bus->pm)
+ callback = dev->bus->pm->runtime_idle;
else
callback = NULL;
@@ -382,12 +382,12 @@ static int rpm_suspend(struct device *dev, int rpmflags)
__update_runtime_status(dev, RPM_SUSPENDING);
- if (dev->bus && dev->bus->pm && dev->bus->pm->runtime_suspend)
- callback = dev->bus->pm->runtime_suspend;
- else if (dev->type && dev->type->pm && dev->type->pm->runtime_suspend)
+ if (dev->type && dev->type->pm)
callback = dev->type->pm->runtime_suspend;
else if (dev->class && dev->class->pm)
callback = dev->class->pm->runtime_suspend;
+ else if (dev->bus && dev->bus->pm)
+ callback = dev->bus->pm->runtime_suspend;
else
callback = NULL;
@@ -584,12 +584,12 @@ static int rpm_resume(struct device *dev, int rpmflags)
if (dev->pwr_domain)
rpm_callback(dev->pwr_domain->ops.runtime_resume, dev);
- if (dev->bus && dev->bus->pm && dev->bus->pm->runtime_resume)
- callback = dev->bus->pm->runtime_resume;
- else if (dev->type && dev->type->pm && dev->type->pm->runtime_resume)
+ if (dev->type && dev->type->pm)
callback = dev->type->pm->runtime_resume;
else if (dev->class && dev->class->pm)
callback = dev->class->pm->runtime_resume;
+ else if (dev->bus && dev->bus->pm)
+ callback = dev->bus->pm->runtime_resume;
else
callback = NULL;
generated by cgit v1.2.3 (git 2.25.1) at 2024-08-04 23:28:55 +0000