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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: Tobias Jakobi <tjakobi@math.uni-bielefeld.de>
Suggested-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Lukasz Luba <l.luba@partner.samsung.com>
Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
This commit is contained in:
Lukasz Luba 2018-12-05 12:05:54 +01:00 committed by MyungJoo Ham
parent 83f8ca45af
commit 5903195605
2 changed files with 50 additions and 0 deletions
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44
drivers/devfreq/devfreq.c
View File

@ -934,6 +934,50 @@ int devfreq_resume_device(struct devfreq *devfreq)
} }
EXPORT_SYMBOL(devfreq_resume_device); 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 * devfreq_add_governor() - Add devfreq governor
* @governor: the devfreq governor to be added * @governor: the devfreq governor to be added

6
include/linux/devfreq.h
View File

@ -205,6 +205,9 @@ extern void devm_devfreq_remove_device(struct device *dev,
extern int devfreq_suspend_device(struct devfreq *devfreq); extern int devfreq_suspend_device(struct devfreq *devfreq);
extern int devfreq_resume_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 * update_devfreq() - Reevaluate the device and configure frequency
* @devfreq: the devfreq device * @devfreq: the devfreq device
@ -331,6 +334,9 @@ static inline int devfreq_resume_device(struct devfreq *devfreq)
return 0; 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, static inline struct dev_pm_opp *devfreq_recommended_opp(struct device *dev,
unsigned long *freq, u32 flags) unsigned long *freq, u32 flags)
{ {