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authorHelge Deller <deller@gmx.de>2008-01-13 23:01:13 +0000
committerRichard Purdie <rpurdie@rpsys.net>2008-02-07 09:31:52 +0000
commit515524537999c1f107a0a7c7f74c034979c2c86d (patch)
tree409cfcb5c15a2e46e67a9790850b94ac7a7fa8d4 /drivers/video
parent488b5ec871191359b9b79262a3d48456dae7ea5f (diff)
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>
Diffstat (limited to 'drivers/video')
-rw-r--r--drivers/video/backlight/backlight.c12
1 files 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;
}
}