On Thursday 04 of October 2012 14:58:33 Rajagopal Venkat wrote:
Add devfreq suspend/resume apis for devfreq users. This patch supports suspend and resume of devfreq load monitoring, required for devices which can idle.
Signed-off-by: Rajagopal Venkat rajagopal.venkat@linaro.org Acked-by: MyungJoo Ham myungjoo.ham@samsung.com
Well, I wonder if this may be tied in to the runtime PM framework, so that, for example, pm_runtime_suspend() will automatically suspend devfreq on success (and the runtime resume of the device will resume devfreq)?
Rafael
drivers/devfreq/devfreq.c | 28 ++++++++++++++++++++++++++++ drivers/devfreq/governor.h | 2 ++ drivers/devfreq/governor_simpleondemand.c | 9 +++++++++ include/linux/devfreq.h | 12 ++++++++++++ 4 files changed, 51 insertions(+)
diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c index 41a4099..63e075e 100644 --- a/drivers/devfreq/devfreq.c +++ b/drivers/devfreq/devfreq.c @@ -428,6 +428,34 @@ 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;- return devfreq->governor->event_handler(devfreq,
DEVFREQ_GOV_SUSPEND, NULL);+} +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;- return devfreq->governor->event_handler(devfreq,
DEVFREQ_GOV_RESUME, NULL);+} +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.h b/drivers/devfreq/governor.h index bb3aff3..26432ac 100644 --- a/drivers/devfreq/governor.h +++ b/drivers/devfreq/governor.h @@ -22,6 +22,8 @@ #define DEVFREQ_GOV_START 0x1 #define DEVFREQ_GOV_STOP 0x2 #define DEVFREQ_GOV_INTERVAL 0x3 +#define DEVFREQ_GOV_SUSPEND 0x4 +#define DEVFREQ_GOV_RESUME 0x5 /* Caution: devfreq->lock must be locked before calling update_devfreq */ extern int update_devfreq(struct devfreq *devfreq); diff --git a/drivers/devfreq/governor_simpleondemand.c b/drivers/devfreq/governor_simpleondemand.c index cf94218..a8ba78c 100644 --- a/drivers/devfreq/governor_simpleondemand.c +++ b/drivers/devfreq/governor_simpleondemand.c @@ -104,6 +104,15 @@ int devfreq_simple_ondemand_handler(struct devfreq *devfreq, case DEVFREQ_GOV_INTERVAL: devfreq_interval_update(devfreq, (unsigned int *)data); break;
- case DEVFREQ_GOV_SUSPEND:
devfreq_monitor_suspend(devfreq);break;- case DEVFREQ_GOV_RESUME:
devfreq_monitor_resume(devfreq);break;- default: break; }
diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h index 9cdffde..ee243a3 100644 --- a/include/linux/devfreq.h +++ b/include/linux/devfreq.h @@ -158,6 +158,8 @@ extern struct devfreq *devfreq_add_device(struct device *dev, const struct devfreq_governor *governor, 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, @@ -211,6 +213,16 @@ static int devfreq_remove_device(struct devfreq *devfreq) return 0; } +static int devfreq_suspend_device(struct devfreq *devfreq) +{
- return 0;
+}
+static int devfreq_resume_device(struct devfreq *devfreq) +{
- return 0;
+}
static struct opp *devfreq_recommended_opp(struct device *dev, unsigned long *freq, u32 flags) {