This patch adds suspend and resume apis needed
for devices which can idle. Suspend/resume apis
are called from driver to suspend/resume devfreq
load monitoring of that device.
Signed-off-by: Rajagopal Venkat <rajagopal.ven...@linaro.org>
---
drivers/devfreq/devfreq.c | 30 ++++++++++++++++++++++++++++++
drivers/devfreq/governor_simpleondemand.c | 15 +++++++++++++++
include/linux/devfreq.h | 16 ++++++++++++++++
3 files changed, 61 insertions(+)
diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
index 5aa23a8..375b5aa1 100644
--- a/drivers/devfreq/devfreq.c
+++ b/drivers/devfreq/devfreq.c
@@ -233,6 +233,36 @@ int devfreq_remove_device(struct devfreq *devfreq)
}
EXPORT_SYMBOL(devfreq_remove_device);
+/**
+ * devfreq_suspend_device() - Suspend devfreq of a device.
+ * @devfreq the devfreq instance to be suspended
+ */
+int devfreq_suspend_device(struct devfreq *devfreq)
+{
+ if (!devfreq)
+ return -EINVAL;
+
+ devfreq->governor->event_handler(devfreq, DEVFREQ_GOV_SUSPEND);
+
+ return 0;
+}
+EXPORT_SYMBOL(devfreq_suspend_device);
+
+/**
+ * devfreq_resume_device() - Resume devfreq of a device.
+ * @devfreq the devfreq instance to be resumed
+ */
+int devfreq_resume_device(struct devfreq *devfreq)
+{
+ if (!devfreq)
+ return -EINVAL;
+
+ devfreq->governor->event_handler(devfreq, DEVFREQ_GOV_RESUME);
+
+ return 0;
+}
+EXPORT_SYMBOL(devfreq_resume_device);
+
static ssize_t show_governor(struct device *dev,
struct device_attribute *attr, char *buf)
{
diff --git a/drivers/devfreq/governor_simpleondemand.c
b/drivers/devfreq/governor_simpleondemand.c
index 7c70c30..95e4db9 100644
--- a/drivers/devfreq/governor_simpleondemand.c
+++ b/drivers/devfreq/governor_simpleondemand.c
@@ -221,6 +221,21 @@ static int devfreq_simple_ondemand_func(struct devfreq *df,
ondemand_exit(df);
break;
+ case DEVFREQ_GOV_SUSPEND:
+ if (delayed_work_pending(&data->work)) {
+ data->stop_queuing = true;
+ cancel_delayed_work_sync(&data->work);
+ }
+ break;
+
+ case DEVFREQ_GOV_RESUME:
+ if (!delayed_work_pending(&data->work)) {
+ data->stop_queuing = false;
+ queue_delayed_work(devfreq_wq, &data->work,
+ msecs_to_jiffies(df->profile->polling_ms));
+ }
+ break;
+
case DEVFREQ_GOV_LIMITS:
if (delayed_work_pending(&data->work)) {
mutex_lock(&df->lock);
diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h
index 600cc2e..7c6517f 100644
--- a/include/linux/devfreq.h
+++ b/include/linux/devfreq.h
@@ -56,6 +56,8 @@ struct devfreq_dev_status {
#define DEVFREQ_GOV_START 0x1
#define DEVFREQ_GOV_STOP 0x2
#define DEVFREQ_GOV_LIMITS 0x3
+#define DEVFREQ_GOV_SUSPEND 0x4
+#define DEVFREQ_GOV_RESUME 0x5
/**
* struct devfreq_dev_profile - Devfreq's user device profile
@@ -155,6 +157,10 @@ extern struct devfreq *devfreq_add_device(struct device
*dev,
void *data);
extern int devfreq_remove_device(struct devfreq *devfreq);
+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);
@@ -207,6 +213,16 @@ static int devfreq_remove_device(struct devfreq *devfreq)
return 0;
}
+static int devfreq_suspend_device(struct devfreq *devfreq)
+{
+ return 0;
+}
+
+extern int devfreq_resume_device(struct devfreq *devfreq)
+{
+ return 0;
+}
+
static struct opp *devfreq_recommended_opp(struct device *dev,
unsigned long *freq, u32 flags)
{
--
1.7.11.3
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