From c740fecdce9b620734e24a98926dbe4f5e5855f1 Mon Sep 17 00:00:00 2001 From: yzq Date: Thu, 24 Jan 2013 22:11:57 +0800 Subject: [PATCH] backlight:fix hdmi switch black screen --- drivers/video/backlight/rk29_backlight.c | 8 ++++++++ 1 file changed, 8 insertions(+) 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); -- 2.34.1