video: rockchip: rk fb: add hot plug state indicate extent screen state

Change-Id: If7dea36a420ef21763c309d12d64d95574b3dcf3
Signed-off-by: Huang Jiachai <hjc@rock-chips.com>

Author: sandy-huang

drivers/video/rockchip/rk_fb.c

@@ -3590,6 +3590,7 @@ int rk_fb_switch_screen(struct rk_screen *screen, int enable, int lcdc_id)
 		enable, lcdc_id, screen->type, dev_drv->cur_screen->type);
 
 	mutex_lock(&dev_drv->switch_screen);
+	dev_drv->hot_plug_state = enable;
 	hdmi_switch_state = 0;
 	dev_drv->hdmi_switch = 1;
 	if (!dev_drv->uboot_logo) {

drivers/video/rockchip/rkfb_sysfs.c

@@ -1205,6 +1205,17 @@ static ssize_t show_dsp_mode(struct device *dev,
 	return snprintf(buf, PAGE_SIZE, "%d\n", dev_drv->dsp_mode);
 }
 
+static ssize_t show_hot_plug_state(struct device *dev,
+			    struct device_attribute *attr,
+			    char *buf)
+{
+	struct fb_info *fbi = dev_get_drvdata(dev);
+	struct rk_fb_par *fb_par = (struct rk_fb_par *)fbi->par;
+	struct rk_lcdc_driver *dev_drv = fb_par->lcdc_drv;
+
+	return snprintf(buf, PAGE_SIZE, "%d\n", dev_drv->hot_plug_state);
+}
+
 static ssize_t show_win_property(struct device *dev,
 			    struct device_attribute *attr,
 			    char *buf)
@@ -1262,6 +1273,7 @@ static struct device_attribute rkfb_attrs[] = {
 	__ATTR(win_property, S_IRUGO, show_win_property, NULL),
 	__ATTR(car_reverse, S_IWUSR, NULL, set_car_reverse),
 	__ATTR(dsp_mode, S_IRUGO, show_dsp_mode, NULL),
+	__ATTR(hot_plug_state, S_IRUGO, show_hot_plug_state, NULL),
 };
 
 int rkfb_create_sysfs(struct fb_info *fbi)

include/linux/rk_fb.h

@@ -702,6 +702,7 @@ struct rk_lcdc_driver {
 	struct device *mmu_dev;
 	int iommu_enabled;
 	int dsp_mode;
+	bool hot_plug_state;
 
 	struct rk_fb_reg_area_data reg_area_data;
 	/*