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>
mutex_lock(&bd->ops_lock);
if (bd->ops) {
pr_debug("backlight: set power to %d\n", power);
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);
rc = count;
}
mutex_unlock(&bd->ops_lock);
else {
pr_debug("backlight: set brightness to %d\n",
brightness);
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);
+ }