1 files changed, 60 insertions, 1 deletions

diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.c b/drivers/gpu/drm/sun4i/sun4i_tcon.c
index 5fbd3ce9d651..9f19b0e08560 100644
--- a/drivers/gpu/drm/sun4i/sun4i_tcon.c
+++ b/drivers/gpu/drm/sun4i/sun4i_tcon.c
@@ -15,10 +15,12 @@
 #include <drm/drm_crtc.h>
 #include <drm/drm_crtc_helper.h>
 #include <drm/drm_modes.h>
+#include <drm/drm_panel.h>
 
 #include <linux/component.h>
 #include <linux/ioport.h>
 #include <linux/of_address.h>
+#include <linux/of_graph.h>
 #include <linux/of_irq.h>
 #include <linux/regmap.h>
 #include <linux/reset.h>
@@ -26,6 +28,7 @@
 #include "sun4i_crtc.h"
 #include "sun4i_dotclock.h"
 #include "sun4i_drv.h"
+#include "sun4i_rgb.h"
 #include "sun4i_tcon.h"
 
 void sun4i_tcon_disable(struct sun4i_tcon *tcon)
@@ -395,6 +398,40 @@ static int sun4i_tcon_init_regmap(struct device *dev,
 	return 0;
 }
 
+static struct drm_panel *sun4i_tcon_find_panel(struct device_node *node)
+{
+	struct device_node *port, *remote, *child;
+	struct device_node *end_node = NULL;
+
+	/* Inputs are listed first, then outputs */
+	port = of_graph_get_port_by_id(node, 1);
+
+	/*
+	 * Our first output is the RGB interface where the panel will
+	 * be connected.
+	 */
+	for_each_child_of_node(port, child) {
+		u32 reg;
+
+		of_property_read_u32(child, "reg", &reg);
+		if (reg == 0)
+			end_node = child;
+	}
+
+	if (!end_node) {
+		DRM_DEBUG_DRIVER("Missing panel endpoint\n");
+		return ERR_PTR(-ENODEV);
+	}
+
+	remote = of_graph_get_remote_port_parent(end_node);
+	if (!remote) {
+		DRM_DEBUG_DRIVER("Enable to parse remote node\n");
+		return ERR_PTR(-EINVAL);
+	}
+
+	return of_drm_find_panel(remote);
+}
+
 static int sun4i_tcon_bind(struct device *dev, struct device *master,
 			   void *data)
 {
@@ -447,7 +484,13 @@ static int sun4i_tcon_bind(struct device *dev, struct device *master,
 		goto err_free_clocks;
 	}
 
-	return 0;
+	tcon->panel = sun4i_tcon_find_panel(dev->of_node);
+	if (IS_ERR(tcon->panel)) {
+		dev_info(dev, "No panel found... RGB output disabled\n");
+		return 0;
+	}
+
+	return sun4i_rgb_init(drm);
 
 err_free_clocks:
 	sun4i_tcon_free_clocks(tcon);
@@ -471,6 +514,22 @@ static struct component_ops sun4i_tcon_ops = {
 
 static int sun4i_tcon_probe(struct platform_device *pdev)
 {
+	struct device_node *node = pdev->dev.of_node;
+	struct drm_panel *panel;
+
+	/*
+	 * The panel is not ready.
+	 * Defer the probe.
+	 */
+	panel = sun4i_tcon_find_panel(node);
+	if (IS_ERR(panel)) {
+		/*
+		 * If we don't have a panel endpoint, just go on
+		 */
+		if (PTR_ERR(panel) != -ENODEV)
+			return -EPROBE_DEFER;
+	}
+
 	return component_add(&pdev->dev, &sun4i_tcon_ops);
 }