diff options
Diffstat (limited to 'drivers/devfreq/devfreq.c')
| -rw-r--r-- | drivers/devfreq/devfreq.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c index 46517b61b3a2..0ae3de76833b 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 */ |