drm/msm/dp: switch to devm_drm_bridge_add()

Make MSM DP driver use devm_drm_bridge_add() instead of plain
drm_bridge_add(). As the driver doesn't require any additional cleanup,
stop adding created bridge to the priv->bridges array.

Reviewed-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/561639/
Signed-off-by: Rob Clark <robdclark@chromium.org>

drivers/gpu/drm/msm/dp/dp_display.c

@@ -1532,7 +1532,6 @@ static int dp_display_get_next_bridge(struct msm_dp *dp)
 int msm_dp_modeset_init(struct msm_dp *dp_display, struct drm_device *dev,
 			struct drm_encoder *encoder)
 {
-	struct msm_drm_private *priv = dev->dev_private;
 	struct dp_display_private *dp_priv;
 	int ret;
 
@@ -1550,17 +1549,13 @@ int msm_dp_modeset_init(struct msm_dp *dp_display, struct drm_device *dev,
 	if (ret)
 		return ret;
 
-	dp_display->bridge = dp_bridge_init(dp_display, dev, encoder);
-	if (IS_ERR(dp_display->bridge)) {
-		ret = PTR_ERR(dp_display->bridge);
+	ret = dp_bridge_init(dp_display, dev, encoder);
+	if (ret) {
 		DRM_DEV_ERROR(dev->dev,
 			"failed to create dp bridge: %d\n", ret);
-		dp_display->bridge = NULL;
 		return ret;
 	}
 
-	priv->bridges[priv->num_bridges++] = dp_display->bridge;
-
 	dp_display->connector = dp_drm_connector_init(dp_display, encoder);
 	if (IS_ERR(dp_display->connector)) {
 		ret = PTR_ERR(dp_display->connector);

drivers/gpu/drm/msm/dp/dp_drm.c

@@ -272,7 +272,7 @@ static const struct drm_bridge_funcs edp_bridge_ops = {
 	.atomic_check = edp_bridge_atomic_check,
 };
 
-struct drm_bridge *dp_bridge_init(struct msm_dp *dp_display, struct drm_device *dev,
+int dp_bridge_init(struct msm_dp *dp_display, struct drm_device *dev,
 			struct drm_encoder *encoder)
 {
 	int rc;
@@ -281,7 +281,7 @@ struct drm_bridge *dp_bridge_init(struct msm_dp *dp_display, struct drm_device *
 
 	dp_bridge = devm_kzalloc(dev->dev, sizeof(*dp_bridge), GFP_KERNEL);
 	if (!dp_bridge)
-		return ERR_PTR(-ENOMEM);
+		return -ENOMEM;
 
 	dp_bridge->dp_display = dp_display;
 
@@ -307,14 +307,18 @@ struct drm_bridge *dp_bridge_init(struct msm_dp *dp_display, struct drm_device *
 			DRM_BRIDGE_OP_MODES;
 	}
 
-	drm_bridge_add(bridge);
+	rc = devm_drm_bridge_add(&dp_display->pdev->dev, bridge);
+	if (rc) {
+		DRM_ERROR("failed to add bridge, rc=%d\n", rc);
+
+		return rc;
+	}
 
 	rc = drm_bridge_attach(encoder, bridge, NULL, DRM_BRIDGE_ATTACH_NO_CONNECTOR);
 	if (rc) {
 		DRM_ERROR("failed to attach bridge, rc=%d\n", rc);
-		drm_bridge_remove(bridge);
 
-		return ERR_PTR(rc);
+		return rc;
 	}
 
 	if (dp_display->next_bridge) {
@@ -323,12 +327,13 @@ struct drm_bridge *dp_bridge_init(struct msm_dp *dp_display, struct drm_device *
 					DRM_BRIDGE_ATTACH_NO_CONNECTOR);
 		if (rc < 0) {
 			DRM_ERROR("failed to attach panel bridge: %d\n", rc);
-			drm_bridge_remove(bridge);
-			return ERR_PTR(rc);
+			return rc;
 		}
 	}
 
-	return bridge;
+	dp_display->bridge = bridge;
+
+	return 0;
 }
 
 /* connector initialization */

drivers/gpu/drm/msm/dp/dp_drm.h

@@ -20,7 +20,7 @@ struct msm_dp_bridge {
 #define to_dp_bridge(x)     container_of((x), struct msm_dp_bridge, bridge)
 
 struct drm_connector *dp_drm_connector_init(struct msm_dp *dp_display, struct drm_encoder *encoder);
-struct drm_bridge *dp_bridge_init(struct msm_dp *dp_display, struct drm_device *dev,
+int dp_bridge_init(struct msm_dp *dp_display, struct drm_device *dev,
 			struct drm_encoder *encoder);
 
 void dp_bridge_atomic_enable(struct drm_bridge *drm_bridge,