diff mbox series

[04/11] PM / devfreq: bail out early if no freq changes in devfreq_set_target

Message ID 1615294733-22761-17-git-send-email-aisheng.dong@nxp.com (mailing list archive)
State New
Delegated to: Chanwoo Choi
Headers show
Series None | expand

Commit Message

Dong Aisheng March 9, 2021, 12:58 p.m. UTC
It's unnecessary to set the same freq again and run notifier calls.

Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
---
 drivers/devfreq/devfreq.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
index bf3047896e41..6e80bf70e7b3 100644
--- a/drivers/devfreq/devfreq.c
+++ b/drivers/devfreq/devfreq.c
@@ -358,6 +358,9 @@  static int devfreq_set_target(struct devfreq *devfreq, unsigned long new_freq,
 	else
 		cur_freq = devfreq->previous_freq;
 
+	if (new_freq == cur_freq)
+		return 0;
+
 	freqs.old = cur_freq;
 	freqs.new = new_freq;
 	devfreq_notify_transition(devfreq, &freqs, DEVFREQ_PRECHANGE);
@@ -374,7 +377,7 @@  static int devfreq_set_target(struct devfreq *devfreq, unsigned long new_freq,
 	 * and DEVFREQ_POSTCHANGE because for showing the correct frequency
 	 * change order of between devfreq device and passive devfreq device.
 	 */
-	if (trace_devfreq_frequency_enabled() && new_freq != cur_freq)
+	if (trace_devfreq_frequency_enabled())
 		trace_devfreq_frequency(devfreq, new_freq, cur_freq);
 
 	freqs.new = new_freq;