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Commit 51552453 authored by Helge Deller's avatar Helge Deller Committed by Richard Purdie
Browse files

backlight: Avoid unecessary driver callbacks 



Avoid driver callbacks when the brightness hasn't changed since
they're not necessary.

Signed-off-by: default avatarHelge Deller <deller@gmx.de>
Signed-off-by: default avatarRichard Purdie <rpurdie@rpsys.net>
parent 488b5ec8

drivers/video/backlight/backlight.c

+8 −4
Original line number Diff line number Diff line
@@ -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);

		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);

			if (bd->props.brightness != brightness) {

				bd->props.brightness = brightness;

				backlight_update_status(bd);

			}

			rc = count;

		}

	}