backlight:fix hdmi switch black screen

diff --git a/drivers/video/backlight/rk29_backlight.c b/drivers/video/backlight/rk29_backlight.c
index 5b4f473b626a7c9949f09ef1a0037d50d745c720..9a8fedf254d1f7ad0301fc240ab05258623cf53d 100755 (executable)
--- 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);