[PATCH v4 6/9] media: rcar-vin: Link parallel input media entities

[Jacopo Mondi]

When running with media-controller link the parallel input
media entities with the VIN entities at 'complete' callback time.

To create media links the v4l2_device should be registered first.
Check if the device is already registered, to avoid double registrations.

Signed-off-by: Jacopo Mondi <jacopo+rene...@jmondi.org>
Acked-by: Niklas Söderlund <niklas.soderlund+rene...@ragnatech.se>
---
 drivers/media/platform/rcar-vin/rcar-core.c | 26 ++++++++++++++++++++++++--
 1 file changed, 24 insertions(+), 2 deletions(-)

diff --git a/drivers/media/platform/rcar-vin/rcar-core.c 
b/drivers/media/platform/rcar-vin/rcar-core.c
index 29619c2..b69b375 100644
--- a/drivers/media/platform/rcar-vin/rcar-core.c
+++ b/drivers/media/platform/rcar-vin/rcar-core.c
@@ -476,6 +476,8 @@ static void rvin_parallel_subdevice_detach(struct rvin_dev 
*vin)
 static int rvin_parallel_notify_complete(struct v4l2_async_notifier *notifier)
 {
        struct rvin_dev *vin = notifier_to_vin(notifier);
+       struct media_entity *source;
+       struct media_entity *sink;
        int ret;
 
        ret = v4l2_device_register_subdev_nodes(&vin->v4l2_dev);
@@ -484,7 +486,26 @@ static int rvin_parallel_notify_complete(struct 
v4l2_async_notifier *notifier)
                return ret;
        }
 
-       return rvin_v4l2_register(vin);
+       if (!video_is_registered(&vin->vdev)) {
+               ret = rvin_v4l2_register(vin);
+               if (ret < 0)
+                       return ret;
+       }
+
+       if (!vin->info->use_mc)
+               return 0;
+
+       /* If we're running with media-controller, link the subdevs. */
+       source = &vin->parallel->subdev->entity;
+       sink = &vin->vdev.entity;
+
+       ret = media_create_pad_link(source, vin->parallel->source_pad,
+                                   sink, vin->parallel->sink_pad, 0);
+       if (ret)
+               vin_err(vin, "Error adding link from %s to %s: %d\n",
+                       source->name, sink->name, ret);
+
+       return ret;
 }
 
 static void rvin_parallel_notify_unbind(struct v4l2_async_notifier *notifier,
@@ -604,7 +625,8 @@ static int rvin_group_notify_complete(struct 
v4l2_async_notifier *notifier)
 
        /* Register all video nodes for the group. */
        for (i = 0; i < RCAR_VIN_NUM; i++) {
-               if (vin->group->vin[i]) {
+               if (vin->group->vin[i] &&
+                   !video_is_registered(&vin->group->vin[i]->vdev)) {
                        ret = rvin_v4l2_register(vin->group->vin[i]);
                        if (ret)
                                return ret;
-- 
2.7.4