Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 59031956 authored by Lukasz Luba's avatar Lukasz Luba Committed by MyungJoo Ham
Browse files

PM / devfreq: add devfreq_suspend/resume() functions 



This patch adds implementation for global suspend/resume for
devfreq framework. System suspend will next use these functions.

Suggested-by: default avatarTobias Jakobi <tjakobi@math.uni-bielefeld.de>
Suggested-by: default avatarChanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: default avatarLukasz Luba <l.luba@partner.samsung.com>
Reviewed-by: default avatarChanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: default avatarMyungJoo Ham <myungjoo.ham@samsung.com>
parent 83f8ca45

drivers/devfreq/devfreq.c

+44 −0
Original line number Diff line number Diff line
@@ -934,6 +934,50 @@ int devfreq_resume_device(struct devfreq *devfreq) 
}

EXPORT_SYMBOL(devfreq_resume_device);



/**

 * devfreq_suspend() - Suspend devfreq governors and devices

 *

 * Called during system wide Suspend/Hibernate cycles for suspending governors

 * and devices preserving the state for resume. On some platforms the devfreq

 * device must have precise state (frequency) after resume in order to provide

 * fully operating setup.

 */

void devfreq_suspend(void)

{

	struct devfreq *devfreq;

	int ret;



	mutex_lock(&devfreq_list_lock);

	list_for_each_entry(devfreq, &devfreq_list, node) {

		ret = devfreq_suspend_device(devfreq);

		if (ret)

			dev_err(&devfreq->dev,

				"failed to suspend devfreq device\n");

	}

	mutex_unlock(&devfreq_list_lock);

}



/**

 * devfreq_resume() - Resume devfreq governors and devices

 *

 * Called during system wide Suspend/Hibernate cycle for resuming governors and

 * devices that are suspended with devfreq_suspend().

 */

void devfreq_resume(void)

{

	struct devfreq *devfreq;

	int ret;



	mutex_lock(&devfreq_list_lock);

	list_for_each_entry(devfreq, &devfreq_list, node) {

		ret = devfreq_resume_device(devfreq);

		if (ret)

			dev_warn(&devfreq->dev,

				 "failed to resume devfreq device\n");

	}

	mutex_unlock(&devfreq_list_lock);

}



/**

 * devfreq_add_governor() - Add devfreq governor

 * @governor:	the devfreq governor to be added

include/linux/devfreq.h

+6 −0
Original line number Diff line number Diff line
@@ -205,6 +205,9 @@ extern void devm_devfreq_remove_device(struct device *dev, 
extern int devfreq_suspend_device(struct devfreq *devfreq);

extern int devfreq_resume_device(struct devfreq *devfreq);



extern void devfreq_suspend(void);

extern void devfreq_resume(void);



/**

 * update_devfreq() - Reevaluate the device and configure frequency

 * @devfreq:	the devfreq device
@@ -331,6 +334,9 @@ static inline int devfreq_resume_device(struct devfreq *devfreq) 
	return 0;

}



static inline void devfreq_suspend(void) {}

static inline void devfreq_resume(void) {}



static inline struct dev_pm_opp *devfreq_recommended_opp(struct device *dev,

					   unsigned long *freq, u32 flags)

{