From: lyx <lyx@rock-chips.com>
Date: Fri, 28 Sep 2012 03:37:11 +0000 (+0800)
Subject: backlight: fix screen shine when poweroff
X-Git-Tag: firefly_0821_release~8530
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=2fd622234328d1a0919b1737d190feee4af1c504;p=firefly-linux-kernel-4.4.55.git

backlight: fix screen shine when poweroff

[问题描述]
关机时lcd屏幕会闪烁

[问题分析]
lcd闪烁的原因是背光先与lcd打开，或背光后于lcd关闭；
目前代码在关机的时候并没有关闭背光的硬件开关，导致闪烁；

[修改说明]
背光的shutdown函数中，增加背光的关闭
---

diff --git a/drivers/video/backlight/rk29_backlight.c b/drivers/video/backlight/rk29_backlight.c
index 49a78e3df766..596c37e8c6df 100755
--- a/drivers/video/backlight/rk29_backlight.c
+++ b/drivers/video/backlight/rk29_backlight.c
@@ -335,6 +335,9 @@ static void rk29_backlight_shutdown(struct platform_device *pdev)
 	rk29_bl->props.brightness = 0;
 	rk29_bl_update_status(rk29_bl);
 
+	if (rk29_bl_info && rk29_bl_info->pwm_suspend)
+		rk29_bl_info->pwm_suspend();
+
 	if (rk29_bl_info && rk29_bl_info->io_deinit)
 		rk29_bl_info->io_deinit();
 }