backlight: Avoid unecessary driver callbacks
Avoid driver callbacks when the brightness hasn't changed since
they're not necessary.
Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
diff --git a/drivers/video/backlight/backlight.c b/drivers/video/backlight/backlight.c
index 4840fe2..3939475 100644
--- a/drivers/video/backlight/backlight.c
+++ b/drivers/video/backlight/backlight.c
@@ -94,8 +94,10 @@
mutex_lock(&bd->ops_lock);
if (bd->ops) {
pr_debug("backlight: set power to %d\n", power);
- bd->props.power = power;
- backlight_update_status(bd);
+ if (bd->props.power != power) {
+ bd->props.power = power;
+ backlight_update_status(bd);
+ }
rc = count;
}
mutex_unlock(&bd->ops_lock);
@@ -132,8 +134,10 @@
else {
pr_debug("backlight: set brightness to %d\n",
brightness);
- bd->props.brightness = brightness;
- backlight_update_status(bd);
+ if (bd->props.brightness != brightness) {
+ bd->props.brightness = brightness;
+ backlight_update_status(bd);
+ }
rc = count;
}
}