From: xubilv <xbl@rock-chips.com>
Date: Thu, 30 Apr 2015 06:48:03 +0000 (+0800)
Subject: MIPI: Provide a function，get screen type，for frequency conversion.
X-Git-Tag: firefly_0821_release~4158^2~152
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=cdbefa5475d5dd5c84d2f25fb4eb0010f9737c33;p=firefly-linux-kernel-4.4.55.git

MIPI: Provide a function，get screen type，for frequency conversion.

Signed-off-by: xubilv <xbl@rock-chips.com>
---

diff --git a/drivers/video/rockchip/transmitter/rk32_mipi_dsi.c b/drivers/video/rockchip/transmitter/rk32_mipi_dsi.c
index aa2366f36e7f..97881a112f7e 100755
--- a/drivers/video/rockchip/transmitter/rk32_mipi_dsi.c
+++ b/drivers/video/rockchip/transmitter/rk32_mipi_dsi.c
@@ -85,6 +85,26 @@ static int rk32_mipi_power_down_DDR(void);
 static int rk32_mipi_power_up_DDR(void);
 int rk_mipi_screen_standby(u8 enable);
 
+int rockchip_get_screen_type(void)
+{
+	struct device_node *type_node;
+	struct device_node *childnode;
+	u32 val = 0;
+
+	type_node = of_find_node_by_name(NULL, "display-timings");
+	if (!type_node) {
+		pr_err("could not find display-timings node\n");
+		return -1;
+	}
+
+	for_each_child_of_node(type_node, childnode) {
+		if (!of_property_read_u32(childnode, "screen-type", &val))
+			return val;
+	}
+
+	return 0;
+}
+
 static int rk32_dsi_read_reg(struct dsi *dsi, u16 reg, u32 *pval)
 {
 	if (dsi->ops.id == DWC_DSI_VERSION)
diff --git a/include/linux/rk_fb.h b/include/linux/rk_fb.h
index 6cc5c9236823..0e2d9eeffcbb 100755
--- a/include/linux/rk_fb.h
+++ b/include/linux/rk_fb.h
@@ -727,4 +727,5 @@ int rk_fb_get_display_policy(void);
 int rk_fb_pixel_width(int data_format);
 void trace_buffer_dump(struct device *dev,
 			      struct rk_lcdc_driver *dev_drv);
+extern int rockchip_get_screen_type(void);
 #endif