linux-kernel - [PATCH RFC 5/5] drm/msm: mdp4 lvds: Check the panel node in detect

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Message-Id: <1439567497-13855-1-git-send-email-srinivas.kandagatla@linaro.org>
Date:	Fri, 14 Aug 2015 16:51:37 +0100
From:	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:	Thierry Reding <thierry.reding@...il.com>,
	dri-devel@...ts.freedesktop.org
Cc:	David Airlie <airlied@...ux.ie>, linux-kernel@...r.kernel.org,
	linux-arm-msm@...r.kernel.org, robdclark@...il.com, bjorn@...o.se,
	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Subject: [PATCH RFC 5/5] drm/msm: mdp4 lvds: Check the panel node in detect_panel()

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@...aro.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

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