thermal: step_wise: cdev only needs update on a new target state
The cooling device only needs update on a new target state. Since we
already check old target in thermal_zone_trip_update(), we can do one
more check to see if it's a new target state. If not, we can reasonably
save some uncecesary code execution.
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Eduardo Valentin <eduardo.valentin@ti.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
diff --git a/drivers/thermal/step_wise.c b/drivers/thermal/step_wise.c
index 4d4ddae..0afbd86 100644
--- a/drivers/thermal/step_wise.c
+++ b/drivers/thermal/step_wise.c
@@ -133,6 +133,9 @@
old_target = instance->target;
instance->target = get_target_state(instance, trend, throttle);
+ if (old_target == instance->target)
+ continue;
+
/* Activate a passive thermal instance */
if (old_target == THERMAL_NO_TARGET &&
instance->target != THERMAL_NO_TARGET)