[PATCH RFC 5/5] drm/msm: mdp4 lvds: Check the panel node in detect_panel()

[Srinivas Kandagatla]

This patch checks if the panel node is disabled in DT or not, this would
let us return proper error code so that the driver could stop panel
specific intialization.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla at linaro.org>
---
 drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c b/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c
index ad02b8b..167f402 100644
--- a/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c
+++ b/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c
@@ -262,6 +262,11 @@ static struct drm_panel *detect_panel(struct drm_device *dev)
 
 	of_node_put(endpoint);
 
+	if (!of_device_is_available(panel_node)) {
+		dev_err(dev->dev, "panel is not enabled in DT\n");
+		return ERR_PTR(-ENODEV);
+	}
+
 	panel = of_drm_find_panel(panel_node);
 	if (!panel) {
 		of_node_put(panel_node);
-- 
1.9.1