media: rcar-vin: Improve reuse of parallel notifier

In preparation for adding a new media graph layout move the code reuse
of the parallel notifier setup from probe directly to the current media
graph initialization function. This is needed as there will be no
parallel interface in the new graph layout.
Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Reviewed-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/platform/rcar-vin/rcar-core.c

@@ -702,9 +702,8 @@ static int rvin_parallel_init(struct rvin_dev *vin)
 	if (ret)
 		return ret;
 
-	/* If using mc, it's fine not to have any input registered. */
 	if (!vin->parallel.asd)
-		return vin->info->use_mc ? 0 : -ENODEV;
+		return -ENODEV;
 
 	vin_dbg(vin, "Found parallel subdevice %pOF\n",
 		to_of_node(vin->parallel.asd->match.fwnode));
@@ -955,11 +954,10 @@ static int rvin_mc_parse_of_graph(struct rvin_dev *vin)
 
 static void rvin_csi2_cleanup(struct rvin_dev *vin)
 {
-	if (!vin->info->use_mc)
-		return;
-
+	rvin_parallel_cleanup(vin);
 	rvin_group_notifier_cleanup(vin);
 	rvin_group_put(vin);
+	rvin_free_controls(vin);
 }
 
 static int rvin_csi2_init(struct rvin_dev *vin)
@@ -979,11 +977,18 @@ static int rvin_csi2_init(struct rvin_dev *vin)
 	if (ret)
 		goto err_controls;
 
+	/* It's OK to not have a parallel subdevice. */
+	ret = rvin_parallel_init(vin);
+	if (ret && ret != -ENODEV)
+		goto err_group;
+
 	ret = rvin_mc_parse_of_graph(vin);
 	if (ret)
-		goto err_group;
+		goto err_parallel;
 
 	return 0;
+err_parallel:
+	rvin_parallel_cleanup(vin);
 err_group:
 	rvin_group_put(vin);
 err_controls:
@@ -1473,27 +1478,20 @@ static int rcar_vin_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, vin);
 
-	if (vin->info->use_mc) {
+	if (vin->info->use_mc)
 		ret = rvin_csi2_init(vin);
-		if (ret)
-			goto error_dma_unregister;
-	}
-
+	else
 		ret = rvin_parallel_init(vin);
-	if (ret)
-		goto error_group_unregister;
+
+	if (ret) {
+		rvin_dma_unregister(vin);
+		return ret;
+	}
 
 	pm_suspend_ignore_children(&pdev->dev, true);
 	pm_runtime_enable(&pdev->dev);
 
 	return 0;
-error_group_unregister:
-	rvin_free_controls(vin);
-	rvin_csi2_cleanup(vin);
-error_dma_unregister:
-	rvin_dma_unregister(vin);
-
-	return ret;
 }
 
 static int rcar_vin_remove(struct platform_device *pdev)
@@ -1504,11 +1502,10 @@ static int rcar_vin_remove(struct platform_device *pdev)
 
 	rvin_v4l2_unregister(vin);
 
-	rvin_parallel_cleanup(vin);
-
+	if (vin->info->use_mc)
 		rvin_csi2_cleanup(vin);
-
-	rvin_free_controls(vin);
+	else
+		rvin_parallel_cleanup(vin);
 
 	rvin_dma_unregister(vin);