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authorLukasz Luba <l.luba@partner.samsung.com>2018-12-05 12:05:54 +0100
committerMyungJoo Ham <myungjoo.ham@samsung.com>2018-12-11 11:40:13 +0900
commit5903195605287681f55094bbcdf8711ea109969b (patch)
treed86178f405d858f69b909b24bb66d40f0e8e4c38 /drivers/devfreq
parent83f8ca45afbf041e312909f442128b99657d90b7 (diff)
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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>
Diffstat (limited to 'drivers/devfreq')
-rw-r--r--drivers/devfreq/devfreq.c44
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
*/