1 files changed, 43 insertions, 10 deletions

diff --git a/drivers/gpu/drm/bridge/lvds-encoder.c b/drivers/gpu/drm/bridge/lvds-encoder.c
index f56c92f7af7c..ae8fc597eb38 100644
--- a/drivers/gpu/drm/bridge/lvds-encoder.c
+++ b/drivers/gpu/drm/bridge/lvds-encoder.c
@@ -11,11 +11,13 @@
 #include <drm/drm_bridge.h>
 #include <drm/drm_panel.h>
 
+#include <linux/gpio/consumer.h>
 #include <linux/of_graph.h>
 
 struct lvds_encoder {
 	struct drm_bridge bridge;
 	struct drm_bridge *panel_bridge;
+	struct gpio_desc *powerdown_gpio;
 };
 
 static int lvds_encoder_attach(struct drm_bridge *bridge)
@@ -28,54 +30,85 @@ static int lvds_encoder_attach(struct drm_bridge *bridge)
 				 bridge);
 }
 
+static void lvds_encoder_enable(struct drm_bridge *bridge)
+{
+	struct lvds_encoder *lvds_encoder = container_of(bridge,
+							 struct lvds_encoder,
+							 bridge);
+
+	if (lvds_encoder->powerdown_gpio)
+		gpiod_set_value_cansleep(lvds_encoder->powerdown_gpio, 0);
+}
+
+static void lvds_encoder_disable(struct drm_bridge *bridge)
+{
+	struct lvds_encoder *lvds_encoder = container_of(bridge,
+							 struct lvds_encoder,
+							 bridge);
+
+	if (lvds_encoder->powerdown_gpio)
+		gpiod_set_value_cansleep(lvds_encoder->powerdown_gpio, 1);
+}
+
 static struct drm_bridge_funcs funcs = {
 	.attach = lvds_encoder_attach,
+	.enable = lvds_encoder_enable,
+	.disable = lvds_encoder_disable,
 };
 
 static int lvds_encoder_probe(struct platform_device *pdev)
 {
+	struct device *dev = &pdev->dev;
 	struct device_node *port;
 	struct device_node *endpoint;
 	struct device_node *panel_node;
 	struct drm_panel *panel;
 	struct lvds_encoder *lvds_encoder;
 
-	lvds_encoder = devm_kzalloc(&pdev->dev, sizeof(*lvds_encoder),
-				    GFP_KERNEL);
+	lvds_encoder = devm_kzalloc(dev, sizeof(*lvds_encoder), GFP_KERNEL);
 	if (!lvds_encoder)
 		return -ENOMEM;
 
+	lvds_encoder->powerdown_gpio = devm_gpiod_get_optional(dev, "powerdown",
+							       GPIOD_OUT_HIGH);
+	if (IS_ERR(lvds_encoder->powerdown_gpio)) {
+		int err = PTR_ERR(lvds_encoder->powerdown_gpio);
+
+		if (err != -EPROBE_DEFER)
+			dev_err(dev, "powerdown GPIO failure: %d\n", err);
+		return err;
+	}
+
 	/* Locate the panel DT node. */
-	port = of_graph_get_port_by_id(pdev->dev.of_node, 1);
+	port = of_graph_get_port_by_id(dev->of_node, 1);
 	if (!port) {
-		dev_dbg(&pdev->dev, "port 1 not found\n");
+		dev_dbg(dev, "port 1 not found\n");
 		return -ENXIO;
 	}
 
 	endpoint = of_get_child_by_name(port, "endpoint");
 	of_node_put(port);
 	if (!endpoint) {
-		dev_dbg(&pdev->dev, "no endpoint for port 1\n");
+		dev_dbg(dev, "no endpoint for port 1\n");
 		return -ENXIO;
 	}
 
 	panel_node = of_graph_get_remote_port_parent(endpoint);
 	of_node_put(endpoint);
 	if (!panel_node) {
-		dev_dbg(&pdev->dev, "no remote endpoint for port 1\n");
+		dev_dbg(dev, "no remote endpoint for port 1\n");
 		return -ENXIO;
 	}
 
 	panel = of_drm_find_panel(panel_node);
 	of_node_put(panel_node);
 	if (IS_ERR(panel)) {
-		dev_dbg(&pdev->dev, "panel not found, deferring probe\n");
+		dev_dbg(dev, "panel not found, deferring probe\n");
 		return PTR_ERR(panel);
 	}
 
 	lvds_encoder->panel_bridge =
-		devm_drm_panel_bridge_add(&pdev->dev,
-					  panel, DRM_MODE_CONNECTOR_LVDS);
+		devm_drm_panel_bridge_add(dev, panel, DRM_MODE_CONNECTOR_LVDS);
 	if (IS_ERR(lvds_encoder->panel_bridge))
 		return PTR_ERR(lvds_encoder->panel_bridge);
 
@@ -83,7 +116,7 @@ static int lvds_encoder_probe(struct platform_device *pdev)
 	 * but we need a bridge attached to our of_node for our user
 	 * to look up.
 	 */
-	lvds_encoder->bridge.of_node = pdev->dev.of_node;
+	lvds_encoder->bridge.of_node = dev->of_node;
 	lvds_encoder->bridge.funcs = &funcs;
 	drm_bridge_add(&lvds_encoder->bridge);