drm/rockchip: analogix_dp: make panel detect to an optional action

Some boards don't need to declare a panel device node, like the
display interface is DP monitors, so it's necessary to make the
panel detect to an optional action.

Signed-off-by: Yakir Yang <ykk@rock-chips.com>
Acked-by: Mark Yao <mark.yao@rock-chips.com>
Reviewed-by: Tomasz Figa <tomasz.figa@chromium.com>
Reviewed-by: Sean Paul <seanpaul@chromium.org>

1 files changed, 21 insertions, 26 deletions

diff --git a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
index 8557a085d0ac..0755573151af 100644
--- a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
+++ b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
@@ -329,38 +329,33 @@ static int rockchip_dp_probe(struct platform_device *pdev)
 {
         struct device *dev = &pdev->dev;
         struct device_node *panel_node, *port, *endpoint;
+        struct drm_panel *panel = NULL;
         struct rockchip_dp_device *dp;
-        struct drm_panel *panel;
 
         port = of_graph_get_port_by_id(dev->of_node, 1);
-        if (!port) {
-                dev_err(dev, "can't find output port\n");
-                return -EINVAL;
-        }
-
-        endpoint = of_get_child_by_name(port, "endpoint");
-        of_node_put(port);
-        if (!endpoint) {
-                dev_err(dev, "no output endpoint found\n");
-                return -EINVAL;
-        }
-
-        panel_node = of_graph_get_remote_port_parent(endpoint);
-        of_node_put(endpoint);
-        if (!panel_node) {
-                dev_err(dev, "no output node found\n");
-                return -EINVAL;
-        }
-
-        panel = of_drm_find_panel(panel_node);
-        if (!panel) {
-                DRM_ERROR("failed to find panel\n");
+        if (port) {
+                endpoint = of_get_child_by_name(port, "endpoint");
+                of_node_put(port);
+                if (!endpoint) {
+                        dev_err(dev, "no output endpoint found\n");
+                        return -EINVAL;
+                }
+
+                panel_node = of_graph_get_remote_port_parent(endpoint);
+                of_node_put(endpoint);
+                if (!panel_node) {
+                        dev_err(dev, "no output node found\n");
+                        return -EINVAL;
+                }
+
+                panel = of_drm_find_panel(panel_node);
                 of_node_put(panel_node);
-                return -EPROBE_DEFER;
+                if (!panel) {
+                        DRM_ERROR("failed to find panel\n");
+                        return -EPROBE_DEFER;
+                }
         }
 
-        of_node_put(panel_node);
-
         dp = devm_kzalloc(dev, sizeof(*dp), GFP_KERNEL);
         if (!dp)
                 return -ENOMEM;