diff --git a/drivers/video/backlight/rk29_backlight.c b/drivers/video/backlight/rk29_backlight.c
index 5b4f473b626a..9a8fedf254d1 100755
--- a/drivers/video/backlight/rk29_backlight.c
+++ b/drivers/video/backlight/rk29_backlight.c
@@ -142,9 +142,17 @@ static int rk29_bl_update_status(struct backlight_device *bl)
 			rk29_bl_info->pwm_resume();
 		clk_enable(pwm_clk);
 		msleep(1);
+		div_total = read_pwm_reg(PWM_REG_LRC);
+		if (ref) {
+			divh = div_total*brightness/BL_STEP;
+		} else {
+			divh = div_total*(BL_STEP-brightness)/BL_STEP;
+		}
+		rk_pwm_setup(id, PWM_DIV, divh, div_total);
 	}
 
 
+
 	DBG("%s:line=%d,brightness = %d, div_total = %d, divh = %d state=%x \n",__FUNCTION__,__LINE__,brightness, div_total, divh,bl->props.state);
 out:
 	mutex_unlock(&backlight_mutex);