Commit 206c30cf authored by Rajagopal Venkat's avatar Rajagopal Venkat Committed by Rafael J. Wysocki
Browse files

PM / devfreq: Add suspend and resume apis 



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: default avatarRajagopal Venkat <rajagopal.venkat@linaro.org>
Acked-by: default avatarMyungJoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 7e6fdd4b

drivers/devfreq/devfreq.c

+28 −0
Original line number Diff line number Diff line
@@ -427,6 +427,34 @@ 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)

{

drivers/devfreq/governor.h

+2 −0
Original line number Diff line number Diff line
@@ -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);

drivers/devfreq/governor_simpleondemand.c

+9 −0
Original line number Diff line number Diff line
@@ -104,6 +104,15 @@ static 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;

	}

include/linux/devfreq.h

+12 −0
Original line number Diff line number Diff line
@@ -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)

{

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