drm/msm/dsi: switch to devm_drm_bridge_add()

Make MSM DSI 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/561636/Signed-off-by: Rob Clark <robdclark@chromium.org>

drivers/gpu/drm/msm/dsi/dsi.c

@@ -217,20 +217,14 @@ void __exit msm_dsi_unregister(void)
 int msm_dsi_modeset_init(struct msm_dsi *msm_dsi, struct drm_device *dev,
 			 struct drm_encoder *encoder)
 {
-	struct msm_drm_private *priv = dev->dev_private;
 	int ret;
 
-	if (priv->num_bridges == ARRAY_SIZE(priv->bridges)) {
-		DRM_DEV_ERROR(dev->dev, "too many bridges\n");
-		return -ENOSPC;
-	}
-
 	msm_dsi->dev = dev;
 
 	ret = msm_dsi_host_modeset_init(msm_dsi->host, dev);
 	if (ret) {
 		DRM_DEV_ERROR(dev->dev, "failed to modeset init host: %d\n", ret);
-		goto fail;
+		return ret;
 	}
 
 	if (msm_dsi_is_bonded_dsi(msm_dsi) &&
@@ -244,32 +238,20 @@ int msm_dsi_modeset_init(struct msm_dsi *msm_dsi, struct drm_device *dev,
 
 	msm_dsi->encoder = encoder;
 
-	msm_dsi->bridge = msm_dsi_manager_bridge_init(msm_dsi->id);
-	if (IS_ERR(msm_dsi->bridge)) {
-		ret = PTR_ERR(msm_dsi->bridge);
+	ret = msm_dsi_manager_bridge_init(msm_dsi);
+	if (ret) {
 		DRM_DEV_ERROR(dev->dev, "failed to create dsi bridge: %d\n", ret);
-		msm_dsi->bridge = NULL;
-		goto fail;
+		return ret;
 	}
 
 	ret = msm_dsi_manager_ext_bridge_init(msm_dsi->id);
 	if (ret) {
 		DRM_DEV_ERROR(dev->dev,
 			"failed to create dsi connector: %d\n", ret);
-		goto fail;
+		return ret;
 	}
 
-	priv->bridges[priv->num_bridges++]       = msm_dsi->bridge;
-
 	return 0;
-fail:
-	/* bridge/connector are normally destroyed by drm: */
-	if (msm_dsi->bridge) {
-		msm_dsi_manager_bridge_destroy(msm_dsi->bridge);
-		msm_dsi->bridge = NULL;
-	}
-
-	return ret;
 }
 
 void msm_dsi_snapshot(struct msm_disp_state *disp_state, struct msm_dsi *msm_dsi)

drivers/gpu/drm/msm/dsi/dsi.h

@@ -56,8 +56,7 @@ struct msm_dsi {
 };
 
 /* dsi manager */
-struct drm_bridge *msm_dsi_manager_bridge_init(u8 id);
-void msm_dsi_manager_bridge_destroy(struct drm_bridge *bridge);
+int msm_dsi_manager_bridge_init(struct msm_dsi *msm_dsi);
 int msm_dsi_manager_ext_bridge_init(u8 id);
 int msm_dsi_manager_cmd_xfer(int id, const struct mipi_dsi_msg *msg);
 bool msm_dsi_manager_cmd_xfer_trigger(int id, u32 dma_base, u32 len);

drivers/gpu/drm/msm/dsi/dsi_manager.c

@@ -466,9 +466,8 @@ static const struct drm_bridge_funcs dsi_mgr_bridge_funcs = {
 };
 
 /* initialize bridge */
-struct drm_bridge *msm_dsi_manager_bridge_init(u8 id)
+int msm_dsi_manager_bridge_init(struct msm_dsi *msm_dsi)
 {
-	struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id);
 	struct drm_bridge *bridge = NULL;
 	struct dsi_bridge *dsi_bridge;
 	struct drm_encoder *encoder;
@@ -476,31 +475,27 @@ struct drm_bridge *msm_dsi_manager_bridge_init(u8 id)
 
 	dsi_bridge = devm_kzalloc(msm_dsi->dev->dev,
 				sizeof(*dsi_bridge), GFP_KERNEL);
-	if (!dsi_bridge) {
-		ret = -ENOMEM;
-		goto fail;
-	}
+	if (!dsi_bridge)
+		return -ENOMEM;
 
-	dsi_bridge->id = id;
+	dsi_bridge->id = msm_dsi->id;
 
 	encoder = msm_dsi->encoder;
 
 	bridge = &dsi_bridge->base;
 	bridge->funcs = &dsi_mgr_bridge_funcs;
 
-	drm_bridge_add(bridge);
+	ret = devm_drm_bridge_add(&msm_dsi->pdev->dev, bridge);
+	if (ret)
+		return ret;
 
 	ret = drm_bridge_attach(encoder, bridge, NULL, 0);
 	if (ret)
-		goto fail;
+		return ret;
 
-	return bridge;
+	msm_dsi->bridge = bridge;
 
-fail:
-	if (bridge)
-		msm_dsi_manager_bridge_destroy(bridge);
-
-	return ERR_PTR(ret);
+	return 0;
 }
 
 int msm_dsi_manager_ext_bridge_init(u8 id)
@@ -557,11 +552,6 @@ int msm_dsi_manager_ext_bridge_init(u8 id)
 	return 0;
 }
 
-void msm_dsi_manager_bridge_destroy(struct drm_bridge *bridge)
-{
-	drm_bridge_remove(bridge);
-}
-
 int msm_dsi_manager_cmd_xfer(int id, const struct mipi_dsi_msg *msg)
 {
 	struct msm_dsi *msm_dsi = dsi_mgr_get_dsi(id);