linux-kernel - [PATCH v4 05/11] drm/rockchip: analogix_dp: make panel detect to an optional action

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Message-Id: <1467191730-17308-1-git-send-email-ykk@rock-chips.com>
Date:	Wed, 29 Jun 2016 17:15:30 +0800
From:	Yakir Yang <ykk@...k-chips.com>
To:	Mark Yao <yzq@...k-chips.com>, Inki Dae <inki.dae@...sung.com>,
	Jingoo Han <jingoohan1@...il.com>,
	Heiko Stuebner <heiko@...ech.de>
Cc:	Javier Martinez Canillas <javier@....samsung.com>,
	Stéphane Marchesin <marcheu@...omium.org>,
	Sean Paul <seanpaul@...omium.org>,
	Tomasz Figa <tfiga@...omium.org>,
	David Airlie <airlied@...ux.ie>, daniel.vetter@...ll.ch,
	Thierry Reding <treding@...dia.com>, dianders@...omium.org,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	emil.l.velikov@...il.com, Dan Carpenter <dan.carpenter@...cle.com>,
	Yakir Yang <ykk@...k-chips.com>, linux-kernel@...r.kernel.org,
	dri-devel@...ts.freedesktop.org, linux-samsung-soc@...r.kernel.org,
	linux-rockchip@...ts.infradead.org
Subject: [PATCH v4 05/11] 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@...k-chips.com>
Acked-by: Mark Yao <mark.yao@...k-chips.com>
Reviewed-by: Tomasz Figa <tomasz.figa@...omium.com>
---
Changes in v4:
- Move of_node_put(panel_node) directly below of_drm_find_panel (Sean)
- Add reviewed flag from Tomasz

Changes in v3:
- Add the acked flag from Mark.

 drivers/gpu/drm/rockchip/analogix_dp-rockchip.c | 47 +++++++++++--------------
 1 file 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 8557a08..0755573 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;
-- 
1.9.1