===================================================================
@@ -26,6 +26,7 @@
#include <linux/spinlock.h>
#include <linux/wait.h>
#include <linux/timer.h>
+#include <linux/completion.h>
/*
* Callbacks for platform drivers to implement.
@@ -412,9 +413,11 @@ struct dev_pm_info {
pm_message_t power_state;
unsigned int can_wakeup:1;
unsigned int should_wakeup:1;
+ unsigned async_suspend:1;
enum dpm_state status; /* Owned by the PM core */
#ifdef CONFIG_PM_SLEEP
struct list_head entry;
+ struct completion completion;
#endif
#ifdef CONFIG_PM_RUNTIME
struct timer_list suspend_timer;
@@ -508,6 +511,13 @@ extern void __suspend_report_result(cons
__suspend_report_result(__func__, fn, ret); \
} while (0)
+extern int __dpm_wait(struct device *dev, void *ign);
+
+static inline void dpm_wait(struct device *dev)
+{
+ __dpm_wait(dev, NULL);
+}
+
#else /* !CONFIG_PM_SLEEP */
#define device_pm_lock() do {} while (0)
@@ -520,6 +530,8 @@ static inline int dpm_suspend_start(pm_m
#define suspend_report_result(fn, ret) do {} while (0)
+static inline void dpm_wait(struct device *dev) {}
+
#endif /* !CONFIG_PM_SLEEP */
/* How to reorder dpm_list after device_move() */
===================================================================
@@ -25,6 +25,7 @@
#include <linux/resume-trace.h>
#include <linux/rwsem.h>
#include <linux/interrupt.h>
+#include <linux/async.h>
#include "../base.h"
#include "power.h"
@@ -42,6 +43,7 @@
LIST_HEAD(dpm_list);
static DEFINE_MUTEX(dpm_list_mtx);
+static pm_message_t pm_transition;
/*
* Set once the preparation of devices for a PM transition has started, reset
@@ -56,6 +58,7 @@ static bool transition_started;
void device_pm_init(struct device *dev)
{
dev->power.status = DPM_ON;
+ init_completion(&dev->power.completion);
pm_runtime_init(dev);
}
@@ -162,6 +165,39 @@ void device_pm_move_last(struct device *
}
/**
+ * __dpm_wait - Wait for a PM operation to complete.
+ * @dev: Device to wait for.
+ * @ign: This value is not used by the function.
+ */
+int __dpm_wait(struct device *dev, void *ign)
+{
+ if (dev)
+ wait_for_completion(&dev->power.completion);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(__dpm_wait);
+
+static void dpm_wait_for_children(struct device *dev)
+{
+ device_for_each_child(dev, NULL, __dpm_wait);
+}
+
+/**
+ * dpm_synchronize - Wait for PM callbacks of all devices to complete.
+ */
+static void dpm_synchronize(void)
+{
+ struct device *dev;
+
+ async_synchronize_full();
+
+ mutex_lock(&dpm_list_mtx);
+ list_for_each_entry(dev, &dpm_list, power.entry)
+ INIT_COMPLETION(dev->power.completion);
+ mutex_unlock(&dpm_list_mtx);
+}
+
+/**
* pm_op - Execute the PM operation appropriate for given PM event.
* @dev: Device to handle.
* @ops: PM operations to choose from.
@@ -381,17 +417,18 @@ void dpm_resume_noirq(pm_message_t state
EXPORT_SYMBOL_GPL(dpm_resume_noirq);
/**
- * device_resume - Execute "resume" callbacks for given device.
+ * __device_resume - Execute "resume" callbacks for given device.
* @dev: Device to handle.
* @state: PM transition of the system being carried out.
*/
-static int device_resume(struct device *dev, pm_message_t state)
+static int __device_resume(struct device *dev, pm_message_t state)
{
int error = 0;
TRACE_DEVICE(dev);
TRACE_RESUME(0);
+ dpm_wait(dev->parent);
down(&dev->sem);
if (dev->bus) {
@@ -426,11 +463,34 @@ static int device_resume(struct device *
}
End:
up(&dev->sem);
+ complete_all(&dev->power.completion);
TRACE_RESUME(error);
return error;
}
+static void async_resume(void *data, async_cookie_t cookie)
+{
+ struct device *dev = (struct device *)data;
+ int error;
+
+ error = __device_resume(dev, pm_transition);
+ if (error)
+ pm_dev_err(dev, pm_transition, " async", error);
+ put_device(dev);
+}
+
+static int device_resume(struct device *dev)
+{
+ if (dev->power.async_suspend && !pm_trace_is_enabled()) {
+ get_device(dev);
+ async_schedule(async_resume, dev);
+ return 0;
+ }
+
+ return __device_resume(dev, pm_transition);
+}
+
/**
* dpm_resume - Execute "resume" callbacks for non-sysdev devices.
* @state: PM transition of the system being carried out.
@@ -444,6 +504,7 @@ static void dpm_resume(pm_message_t stat
INIT_LIST_HEAD(&list);
mutex_lock(&dpm_list_mtx);
+ pm_transition = state;
while (!list_empty(&dpm_list)) {
struct device *dev = to_device(dpm_list.next);
@@ -454,7 +515,7 @@ static void dpm_resume(pm_message_t stat
dev->power.status = DPM_RESUMING;
mutex_unlock(&dpm_list_mtx);
- error = device_resume(dev, state);
+ error = device_resume(dev);
mutex_lock(&dpm_list_mtx);
if (error)
@@ -469,6 +530,7 @@ static void dpm_resume(pm_message_t stat
}
list_splice(&list, &dpm_list);
mutex_unlock(&dpm_list_mtx);
+ dpm_synchronize();
}
/**
@@ -533,6 +595,8 @@ static void dpm_complete(pm_message_t st
mutex_unlock(&dpm_list_mtx);
}
+static atomic_t async_error;
+
/**
* dpm_resume_end - Execute "resume" callbacks and complete system transition.
* @state: PM transition of the system being carried out.
@@ -628,10 +692,11 @@ EXPORT_SYMBOL_GPL(dpm_suspend_noirq);
* @dev: Device to handle.
* @state: PM transition of the system being carried out.
*/
-static int device_suspend(struct device *dev, pm_message_t state)
+static int __device_suspend(struct device *dev, pm_message_t state)
{
int error = 0;
+ dpm_wait_for_children(dev);
down(&dev->sem);
if (dev->class) {
@@ -666,12 +731,50 @@ static int device_suspend(struct device
suspend_report_result(dev->bus->suspend, error);
}
}
+
+ if (!error)
+ dev->power.status = DPM_OFF;
+
End:
up(&dev->sem);
+ complete_all(&dev->power.completion);
return error;
}
+static void async_suspend(void *data, async_cookie_t cookie)
+{
+ struct device *dev = (struct device *)data;
+ int error = atomic_read(&async_error);
+
+ if (error) {
+ complete_all(&dev->power.completion);
+ goto End;
+ }
+
+ error = __device_suspend(dev, pm_transition);
+ if (error) {
+ pm_dev_err(dev, pm_transition, " async", error);
+ atomic_set(&async_error, error);
+ }
+
+ End:
+ put_device(dev);
+}
+
+static int device_suspend(struct device *dev, pm_message_t state)
+{
+ int error;
+
+ if (dev->power.async_suspend) {
+ get_device(dev);
+ async_schedule(async_suspend, dev);
+ return 0;
+ }
+
+ return __device_suspend(dev, pm_transition);
+}
+
/**
* dpm_suspend - Execute "suspend" callbacks for all non-sysdev devices.
* @state: PM transition of the system being carried out.
@@ -683,6 +786,7 @@ static int dpm_suspend(pm_message_t stat
INIT_LIST_HEAD(&list);
mutex_lock(&dpm_list_mtx);
+ pm_transition = state;
while (!list_empty(&dpm_list)) {
struct device *dev = to_device(dpm_list.prev);
@@ -697,13 +801,18 @@ static int dpm_suspend(pm_message_t stat
put_device(dev);
break;
}
- dev->power.status = DPM_OFF;
if (!list_empty(&dev->power.entry))
list_move(&dev->power.entry, &list);
put_device(dev);
+ error = atomic_read(&async_error);
+ if (error)
+ break;
}
list_splice(&list, dpm_list.prev);
mutex_unlock(&dpm_list_mtx);
+ dpm_synchronize();
+ if (!error)
+ error = atomic_read(&async_error);
return error;
}
@@ -762,6 +871,7 @@ static int dpm_prepare(pm_message_t stat
INIT_LIST_HEAD(&list);
mutex_lock(&dpm_list_mtx);
transition_started = true;
+ atomic_set(&async_error, 0);
while (!list_empty(&dpm_list)) {
struct device *dev = to_device(dpm_list.next);
@@ -793,8 +903,10 @@ static int dpm_prepare(pm_message_t stat
break;
}
dev->power.status = DPM_SUSPENDING;
- if (!list_empty(&dev->power.entry))
+ if (!list_empty(&dev->power.entry)) {
list_move_tail(&dev->power.entry, &list);
+ INIT_COMPLETION(dev->power.completion);
+ }
put_device(dev);
}
list_splice(&list, &dpm_list);
===================================================================
@@ -6,6 +6,11 @@
extern int pm_trace_enabled;
+static inline int pm_trace_is_enabled(void)
+{
+ return pm_trace_enabled;
+}
+
struct device;
extern void set_trace_device(struct device *);
extern void generate_resume_trace(const void *tracedata, unsigned int user);
@@ -17,6 +22,8 @@ extern void generate_resume_trace(const
#else
+static inline int pm_trace_is_enabled(void) { return 0; }
+
#define TRACE_DEVICE(dev) do { } while (0)
#define TRACE_RESUME(dev) do { } while (0)
===================================================================
@@ -472,6 +472,12 @@ static inline int device_is_registered(s
return dev->kobj.state_in_sysfs;
}
+static inline void device_enable_async_suspend(struct device *dev, bool enable)
+{
+ if (dev->power.status == DPM_ON)
+ dev->power.async_suspend = enable;
+}
+
void driver_init(void);
/*