[PATCH 2/2] PM / devfreq: tie suspend/resume to runtime-pm
From: Rajagopal Venkat
Date: Thu Mar 21 2013 - 09:35:44 EST
Allow device devfreq to be suspend/resume automatically with
runtime pm suspend/resume. The devfreq drivers should be least
cared when to suspend/resume the devfreq.
pm_runtime_suspend(dev) will first suspend device devfreq(if available)
before device is suspended from runtime pm core.
pm_runtime_resume(dev) will resume device devfreq(if available) after
device is resumed from runtime pm core.
Signed-off-by: Rajagopal Venkat <rajagopal.venkat@xxxxxxxxxx>
---
drivers/base/power/runtime.c | 18 ++++++++++++++-
drivers/devfreq/devfreq.c | 51 ++++++++++++++++++++++++++++++++++++++----
include/linux/devfreq.h | 18 ++++-----------
include/linux/pm.h | 2 ++
4 files changed, 70 insertions(+), 19 deletions(-)
diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
index 3148b10..951bf92 100644
--- a/drivers/base/power/runtime.c
+++ b/drivers/base/power/runtime.c
@@ -11,6 +11,7 @@
#include <linux/export.h>
#include <linux/pm_runtime.h>
#include <trace/events/rpm.h>
+#include <linux/devfreq.h>
#include "power.h"
static int rpm_resume(struct device *dev, int rpmflags);
@@ -406,6 +407,10 @@ static int rpm_suspend(struct device *dev, int rpmflags)
__update_runtime_status(dev, RPM_SUSPENDING);
+ if (dev->power.devfreq &&
+ dev->power.devfreq->runtime_suspend(dev))
+ goto fail;
+
if (dev->pm_domain)
callback = dev->pm_domain->ops.runtime_suspend;
else if (dev->type && dev->type->pm)
@@ -421,8 +426,11 @@ static int rpm_suspend(struct device *dev, int rpmflags)
callback = dev->driver->pm->runtime_suspend;
retval = rpm_callback(callback, dev);
- if (retval)
+ if (retval) {
+ if (dev->power.devfreq)
+ dev->power.devfreq->runtime_resume(dev);
goto fail;
+ }
no_callback:
__update_runtime_status(dev, RPM_SUSPENDED);
@@ -638,6 +646,11 @@ static int rpm_resume(struct device *dev, int rpmflags)
__update_runtime_status(dev, RPM_RESUMING);
+ if (dev->power.devfreq)
+ retval = dev->power.devfreq->runtime_resume(dev);
+ if (retval)
+ goto skip_callback;
+
if (dev->pm_domain)
callback = dev->pm_domain->ops.runtime_resume;
else if (dev->type && dev->type->pm)
@@ -653,9 +666,12 @@ static int rpm_resume(struct device *dev, int rpmflags)
callback = dev->driver->pm->runtime_resume;
retval = rpm_callback(callback, dev);
+skip_callback:
if (retval) {
__update_runtime_status(dev, RPM_SUSPENDED);
pm_runtime_cancel_pending(dev);
+ if (dev->power.devfreq)
+ dev->power.devfreq->runtime_suspend(dev);
} else {
no_callback:
__update_runtime_status(dev, RPM_ACTIVE);
diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
index 44c4079..ed6cb88 100644
--- a/drivers/devfreq/devfreq.c
+++ b/drivers/devfreq/devfreq.c
@@ -25,6 +25,7 @@
#include <linux/list.h>
#include <linux/printk.h>
#include <linux/hrtimer.h>
+#include <linux/pm_runtime.h>
#include "governor.h"
static struct class *devfreq_class;
@@ -42,6 +43,9 @@ static LIST_HEAD(devfreq_governor_list);
static LIST_HEAD(devfreq_list);
static DEFINE_MUTEX(devfreq_list_lock);
+static int devfreq_runtime_suspend(struct device *dev);
+static int devfreq_runtime_resume(struct device *dev);
+
/**
* find_device_devfreq() - find devfreq struct using device pointer
* @dev: device pointer used to lookup device devfreq.
@@ -476,6 +480,9 @@ struct devfreq *devfreq_add_device(struct device *dev,
devfreq->previous_freq = profile->initial_freq;
devfreq->data = data;
devfreq->nb.notifier_call = devfreq_notifier_call;
+ devfreq->runtime_suspend = devfreq_runtime_suspend;
+ devfreq->runtime_resume = devfreq_runtime_resume;
+ dev->power.devfreq = devfreq;
devfreq->trans_table = devm_kzalloc(dev, sizeof(unsigned int) *
devfreq->profile->max_state *
@@ -549,7 +556,7 @@ EXPORT_SYMBOL(devfreq_remove_device);
* (e.g., runtime_suspend, suspend) of the device driver that
* holds the devfreq.
*/
-int devfreq_suspend_device(struct devfreq *devfreq)
+static int devfreq_suspend_device(struct devfreq *devfreq)
{
if (!devfreq)
return -EINVAL;
@@ -560,7 +567,6 @@ int devfreq_suspend_device(struct devfreq *devfreq)
return devfreq->governor->event_handler(devfreq,
DEVFREQ_GOV_SUSPEND, NULL);
}
-EXPORT_SYMBOL(devfreq_suspend_device);
/**
* devfreq_resume_device() - Resume devfreq of a device.
@@ -570,7 +576,7 @@ EXPORT_SYMBOL(devfreq_suspend_device);
* (e.g., runtime_resume, resume) of the device driver that
* holds the devfreq.
*/
-int devfreq_resume_device(struct devfreq *devfreq)
+static int devfreq_resume_device(struct devfreq *devfreq)
{
if (!devfreq)
return -EINVAL;
@@ -581,7 +587,44 @@ int devfreq_resume_device(struct devfreq *devfreq)
return devfreq->governor->event_handler(devfreq,
DEVFREQ_GOV_RESUME, NULL);
}
-EXPORT_SYMBOL(devfreq_resume_device);
+
+/**
+ * devfreq_runtime_suspend() - Suspend devfreq of a device.
+ * @dev: the device associated with devfreq
+ *
+ * This function is intended to be called by the runtime-pm
+ * core when the device associated with devfreq is
+ * runtime suspended.
+ */
+static int devfreq_runtime_suspend(struct device *dev)
+{
+ struct devfreq *devfreq;
+
+ mutex_lock(&devfreq_list_lock);
+ devfreq = find_device_devfreq(dev);
+ mutex_unlock(&devfreq_list_lock);
+
+ return devfreq_suspend_device(devfreq);
+}
+
+/**
+ * devfreq_runtime_resume() - Resume devfreq of a device.
+ * @dev: the device associated with devfreq
+ *
+ * This function is intended to be called by the runtime-pm
+ * core when the device associated with devfreq is
+ * runtime resumed.
+ */
+static int devfreq_runtime_resume(struct device *dev)
+{
+ struct devfreq *devfreq;
+
+ mutex_lock(&devfreq_list_lock);
+ devfreq = find_device_devfreq(dev);
+ mutex_unlock(&devfreq_list_lock);
+
+ return devfreq_resume_device(devfreq);
+}
/**
* devfreq_add_governor() - Add devfreq governor
diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h
index 5f1ab92..f50f46e 100644
--- a/include/linux/devfreq.h
+++ b/include/linux/devfreq.h
@@ -140,6 +140,8 @@ struct devfreq_governor {
* @trans_table: Statistics of devfreq transitions
* @time_in_state: Statistics of devfreq states
* @last_stat_updated: The last time stat updated
+ * @runtime_suspend: func to runtime suspend devfreq from runtime core
+ * @runtime_resume: func to runtime resume devfreq from runtime core
*
* This structure stores the devfreq information for a give device.
*
@@ -173,6 +175,8 @@ struct devfreq {
unsigned int *trans_table;
unsigned long *time_in_state;
unsigned long last_stat_updated;
+ int (*runtime_suspend)(struct device *dev);
+ int (*runtime_resume)(struct device *dev);
};
#if defined(CONFIG_PM_DEVFREQ)
@@ -182,10 +186,6 @@ extern struct devfreq *devfreq_add_device(struct device *dev,
void *data);
extern int devfreq_remove_device(struct devfreq *devfreq);
-/* Supposed to be called by PM_SLEEP/PM_RUNTIME callbacks */
-extern int devfreq_suspend_device(struct devfreq *devfreq);
-extern int devfreq_resume_device(struct devfreq *devfreq);
-
/* Helper functions for devfreq user device driver with OPP. */
extern struct opp *devfreq_recommended_opp(struct device *dev,
unsigned long *freq, u32 flags);
@@ -228,16 +228,6 @@ static inline int devfreq_remove_device(struct devfreq *devfreq)
return 0;
}
-static inline int devfreq_suspend_device(struct devfreq *devfreq)
-{
- return 0;
-}
-
-static inline int devfreq_resume_device(struct devfreq *devfreq)
-{
- return 0;
-}
-
static inline struct opp *devfreq_recommended_opp(struct device *dev,
unsigned long *freq, u32 flags)
{
diff --git a/include/linux/pm.h b/include/linux/pm.h
index 03d7bb1..6097db1 100644
--- a/include/linux/pm.h
+++ b/include/linux/pm.h
@@ -40,6 +40,7 @@ extern void (*pm_power_off_prepare)(void);
*/
struct device;
+struct devfreq;
#ifdef CONFIG_PM
extern const char power_group_name[]; /* = "power" */
@@ -549,6 +550,7 @@ struct dev_pm_info {
#endif
struct pm_subsys_data *subsys_data; /* Owned by the subsystem. */
struct dev_pm_qos *qos;
+ struct devfreq *devfreq;
};
extern void update_pm_runtime_accounting(struct device *dev);
--
1.7.10.4
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