media: rcar-vin: add flag to switch to media controller mode

On Gen3 a media controller API needs to be used to allow userspace to
configure the subdevices in the pipeline instead of directly controlling
a single source subdevice, which is and will continue to be the mode of
operation on Gen2.

Prepare for these two modes of operation by adding a flag to struct
rvin_info which will control which mode to use.
Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

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

@@ -249,18 +249,21 @@ static int rvin_digital_graph_init(struct rvin_dev *vin)
 
 static const struct rvin_info rcar_info_h1 = {
 	.model = RCAR_H1,
+	.use_mc = false,
 	.max_width = 2048,
 	.max_height = 2048,
 };
 
 static const struct rvin_info rcar_info_m1 = {
 	.model = RCAR_M1,
+	.use_mc = false,
 	.max_width = 2048,
 	.max_height = 2048,
 };
 
 static const struct rvin_info rcar_info_gen2 = {
 	.model = RCAR_GEN2,
+	.use_mc = false,
 	.max_width = 2048,
 	.max_height = 2048,
 };
@@ -355,7 +358,8 @@ static int rcar_vin_remove(struct platform_device *pdev)
 	v4l2_async_notifier_unregister(&vin->notifier);
 	v4l2_async_notifier_cleanup(&vin->notifier);
 
-	v4l2_ctrl_handler_free(&vin->ctrl_handler);
+	if (!vin->info->use_mc)
+		v4l2_ctrl_handler_free(&vin->ctrl_handler);
 
 	rvin_dma_unregister(vin);
 

drivers/media/platform/rcar-vin/rcar-vin.h

@@ -75,11 +75,13 @@ struct rvin_graph_entity {
 /**
  * struct rvin_info - Information about the particular VIN implementation
  * @model:		VIN model
+ * @use_mc:		use media controller instead of controlling subdevice
  * @max_width:		max input width the VIN supports
  * @max_height:		max input height the VIN supports
  */
 struct rvin_info {
 	enum model_id model;
+	bool use_mc;
 
 	unsigned int max_width;
 	unsigned int max_height;