| Message ID | 1544007956-28889-4-git-send-email-l.luba@partner.samsung.com (mailing list archive) |
|---|---|
| State | Not Applicable |
| Headers | show |
| Series | devfreq: handle suspend/resume | expand |
Hi Lukasz, On 2018년 12월 05일 20:05, Lukasz Luba wrote: > 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> > --- > drivers/devfreq/devfreq.c | 44 ++++++++++++++++++++++++++++++++++++++++++++ > include/linux/devfreq.h | 6 ++++++ > 2 files changed, 50 insertions(+) Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com> > > diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c > index 46517b6..0ae3de7 100644 > --- a/drivers/devfreq/devfreq.c > +++ b/drivers/devfreq/devfreq.c > @@ -935,6 +935,50 @@ 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 > */ > diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h > index d985199..fbffa74 100644 > --- a/include/linux/devfreq.h > +++ b/include/linux/devfreq.h > @@ -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) > { >
> Hi Lukasz, > > On 2018년 12월 05일 20:05, Lukasz Luba wrote: > > 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> > > --- > > drivers/devfreq/devfreq.c | 44 ++++++++++++++++++++++++++++++++++++++++++++ > > include/linux/devfreq.h | 6 ++++++ > > 2 files changed, 50 insertions(+) > > Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com> Acked-by: MyungJoo Ham <myungjoo.ham@samsung.com> The patches from 1 to 3 are being applied and tested. I'll probably send pull-request to Rafael today after some testing targetting 4.21+ Cheers, MyungJoo
diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c index 46517b6..0ae3de7 100644 --- a/drivers/devfreq/devfreq.c +++ b/drivers/devfreq/devfreq.c @@ -935,6 +935,50 @@ 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 */ diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h index d985199..fbffa74 100644 --- a/include/linux/devfreq.h +++ b/include/linux/devfreq.h @@ -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) {
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> --- drivers/devfreq/devfreq.c | 44 ++++++++++++++++++++++++++++++++++++++++++++ include/linux/devfreq.h | 6 ++++++ 2 files changed, 50 insertions(+)