From 515524537999c1f107a0a7c7f74c034979c2c86d Mon Sep 17 00:00:00 2001 From: Helge Deller Date: Sun, 13 Jan 2008 23:01:13 +0000 Subject: [PATCH] backlight: Avoid unecessary driver callbacks Avoid driver callbacks when the brightness hasn't changed since they're not necessary. Signed-off-by: Helge Deller Signed-off-by: Richard Purdie --- drivers/video/backlight/backlight.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) diff --git a/drivers/video/backlight/backlight.c b/drivers/video/backlight/backlight.c index 4840fe217e4d..39394757679c 100644 --- a/drivers/video/backlight/backlight.c +++ b/drivers/video/backlight/backlight.c @@ -94,8 +94,10 @@ static ssize_t backlight_store_power(struct device *dev, 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 @@ static ssize_t backlight_store_brightness(struct device *dev, 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; } } -- 2.20.1