From: hjc <hjc@rock-chips.com>
Date: Wed, 6 May 2015 07:56:58 +0000 (+0800)
Subject: rk fb: delay 200ms when extern display switch screen can fix mmu pagefault
X-Git-Tag: firefly_0821_release~4158^2~107
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=7bb02ff83e4c681e5a1ea2b220c832ebfd7db0a5;p=firefly-linux-kernel-4.4.55.git

rk fb: delay 200ms when extern display switch screen can fix mmu pagefault
---

diff --git a/drivers/video/rockchip/rk_fb.c b/drivers/video/rockchip/rk_fb.c
index cefd38046ca9..2f0fecdf4282 100755
--- a/drivers/video/rockchip/rk_fb.c
+++ b/drivers/video/rockchip/rk_fb.c
@@ -2671,6 +2671,7 @@ static int rk_fb_blank(int blank_mode, struct fb_info *info)
 	win_id = dev_drv->ops->fb_get_win_id(dev_drv, fix->id);
 	if (win_id < 0)
 		return -ENODEV;
+	mutex_lock(&dev_drv->switch_screen);
 #if defined(CONFIG_RK_HDMI)
 	if ((rk_fb->disp_mode == ONE_DUAL) &&
 	    (hdmi_get_hotplug() == HDMI_HPD_ACTIVED)) {
@@ -2680,6 +2681,7 @@ static int rk_fb_blank(int blank_mode, struct fb_info *info)
 	{
 		dev_drv->ops->blank(dev_drv, win_id, blank_mode);
 	}
+	mutex_unlock(&dev_drv->switch_screen);
 	return 0;
 }
 
@@ -3223,6 +3225,8 @@ int rk_fb_switch_screen(struct rk_screen *screen, int enable, int lcdc_id)
 	mutex_lock(&dev_drv->switch_screen);
 	hdmi_switch_state = 0;
 	dev_drv->hdmi_switch = 1;
+	if (!dev_drv->uboot_logo)
+		mdelay(200);
 
 	envp[0] = "switch screen";
 	envp[1] = kmalloc(32, GFP_KERNEL);