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.venkat@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) {