From: xxx <xxx@rock-chips.com>
Date: Fri, 1 Feb 2013 09:41:21 +0000 (+0800)
Subject: if brightness is set 0,thebrightness real set is 0 not min
X-Git-Tag: firefly_0821_release~7647
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=c804b76b122a10baccb20ff31797cc47bfdf741d;p=firefly-linux-kernel-4.4.55.git

if brightness is set 0,thebrightness real set is 0 not min
---

diff --git a/drivers/video/backlight/rk29_backlight.c b/drivers/video/backlight/rk29_backlight.c
index d2e2e741d3ca..fb49a4853754 100755
--- a/drivers/video/backlight/rk29_backlight.c
+++ b/drivers/video/backlight/rk29_backlight.c
@@ -158,11 +158,13 @@ static int rk29_bl_update_status(struct backlight_device *bl)
 
 	brightness = bl->props.brightness;
 
-	
-	if(rk29_bl_info->brightness_mode==BRIGHTNESS_MODE_LINE)
-		brightness=rk29_bl_val_scalor_line(rk29_bl_info,brightness);
-	else
-		brightness=rk29_bl_val_scalor_conic(rk29_bl_info,brightness);
+	if(brightness)
+	{
+		if(rk29_bl_info->brightness_mode==BRIGHTNESS_MODE_LINE)
+			brightness=rk29_bl_val_scalor_line(rk29_bl_info,brightness);
+		else
+			brightness=rk29_bl_val_scalor_conic(rk29_bl_info,brightness);
+	}
 	//printk("%s,req brightness=%d,real is=%d\n",__FUNCTION__,bl->props.brightness,brightness);
 
 	if (bl->props.power != FB_BLANK_UNBLANK)