camera: vi: Use proper APIs from v4l2 for Linux6.6

The earlier porting of the driver for Linux 6.6 is not
matching with the previous kernel implementation.

Few V4L2 APIs have been deprecated from Linux 6.6. and
added the new APIs.

Use the correct API available from Linux6.6 for the
replacement as the previous supported kernel APIs.

For reference, the changes in core kernels are:
  The device argument is added in the API v4l2_async_nf_init() with
  commit b8ec754ae4c5 ("media: v4l: async: Set v4l2_device and subdev
  in async notifier init") in Linux 6.6.

  The API is removed with commit bda8953e8c3e ("media: v4l: async: Drop
  v4l2_async_nf_parse_fwnode_endpoints()") in Linux 6.6

Bug 4346767

Change-Id: I94877a8fe6a6764fc3c913fea7ecdbfdc7c793d6
Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3042993
GVS: Gerrit_Virtual_Submit <buildbot_gerritrpt@nvidia.com>

drivers/media/platform/tegra/camera/vi/graph.c

@@ -479,12 +479,14 @@ static int tegra_vi_graph_parse_one(struct tegra_channel *chan,
 		}
 
 		entity->node = remote;
+#if !defined(NV_V4L2_ASYNC_CONNECTION_STRUCT_PRESENT) /* Linux 6.5 */
 #if defined(NV_V4L2_ASYNC_MATCH_TYPE_ENUM_PRESENT) /* Linux 6.5 */
 		entity->asd.match.type = V4L2_ASYNC_MATCH_TYPE_FWNODE;
 #else
 		entity->asd.match_type = V4L2_ASYNC_MATCH_FWNODE;
 #endif
 		entity->asd.match.fwnode = of_fwnode_handle(remote);
+#endif
 
 		list_add_tail(&entity->list, &chan->entities);
 		chan->num_subdevs++;
@@ -640,12 +642,14 @@ int tegra_vi_graph_init(struct tegra_mc_vi *vi)
 
 		/* Add the remote entity of this endpoint */
 		entity->node = remote;
+#if !defined(NV_V4L2_ASYNC_CONNECTION_STRUCT_PRESENT) /* Linux 6.5 */
 #if defined(NV_V4L2_ASYNC_MATCH_TYPE_ENUM_PRESENT) /* Linux 6.5 */
 		entity->asd.match.type = V4L2_ASYNC_MATCH_TYPE_FWNODE;
 #else
 		entity->asd.match_type = V4L2_ASYNC_MATCH_FWNODE;
 #endif
 		entity->asd.match.fwnode = of_fwnode_handle(remote);
+#endif
 		list_add_tail(&entity->list, &chan->entities);
 		chan->num_subdevs++;
 		chan->notifier.ops = chan->notifier.ops ? chan->notifier.ops : &vi_chan_notify_ops;
@@ -671,23 +675,26 @@ int tegra_vi_graph_init(struct tegra_mc_vi *vi)
 		list_for_each_entry(entity, &chan->entities, list)
 			__v4l2_async_notifier_add_subdev(&chan->notifier, &entity->asd);
 #else
-#if defined (NV_V4L2_ASYNC_SUBDEV_NF_INIT_PRESENT) /* Linux 6.5 */
+#if defined(NV_V4L2_ASYNC_NF_INIT_HAS_V4L2_DEV_ARG) /* Linux 6.6 */
-		v4l2_async_subdev_nf_init(&chan->notifier, tegra_channel_find_linked_csi_subdev(chan));
+		v4l2_async_nf_init(&chan->notifier, &vi->v4l2_dev);
-		list_for_each_entry(entity, &chan->entities, list) {
-			struct v4l2_async_connection *asd;
-			asd = v4l2_async_nf_add_fwnode_remote(&chan->notifier, of_fwnode_handle(remote),
-				struct v4l2_async_connection);
-			if (IS_ERR(asd)) {
-				ret = PTR_ERR(asd);
-				goto done;
-			}
-		}
 #else
 		v4l2_async_nf_init(&chan->notifier);
+#endif
+
+#if defined(NV_V4L2_ASYNC_NF_ADD_SUBDEV_PRESENT) /* Linux 6.6 */
 		list_for_each_entry(entity, &chan->entities, list)
 			__v4l2_async_nf_add_subdev(&chan->notifier, &entity->asd);
-#endif
+#else
-#endif
+		list_for_each_entry(entity, &chan->entities, list) {
+			struct v4l2_async_connection *asc;
+			asc = v4l2_async_nf_add_fwnode(&chan->notifier, of_fwnode_handle(entity->node),
+					struct v4l2_async_connection);
+			if (IS_ERR(asc))
+				asc = NULL;
+			entity->asc = asc;
+		}
+#endif /* NV_V4L2_ASYNC_NF_ADD_SUBDEV_PRESENT */
+#endif /* NV_V4L2_ASYNC_NOTIFIER_INIT_PRESENT */
 
 		chan->link_status = 0;
 		chan->subdevs_bound = 0;
@@ -697,8 +704,10 @@ int tegra_vi_graph_init(struct tegra_mc_vi *vi)
 		ret = v4l2_async_notifier_register(&vi->v4l2_dev,
 					&chan->notifier);
 #else
-#if defined (NV_V4L2_ASYNC_SUBDEV_NF_INIT_PRESENT) /* Linux 6.5 */
+#if defined (NV_V4L2_ASYNC_NF_INIT_HAS_V4L2_DEV_ARG) /* Linux 6.6 */
 		ret = v4l2_async_nf_register(&chan->notifier);
+		if (ret < 0)
+			v4l2_async_nf_cleanup(&chan->notifier);
 #else
 		ret = v4l2_async_nf_register(&vi->v4l2_dev,
 					&chan->notifier);
@@ -707,9 +716,9 @@ int tegra_vi_graph_init(struct tegra_mc_vi *vi)
 #else
 		dev_err(vi->dev, "CONFIG_V4L2_ASYNC is not enabled!\n");
 		ret = -ENOTSUPP;
-#endif
+#endif /* CONFIG_V4L2_ASYNC */
 		if (ret < 0) {
-			dev_err(vi->dev, "notifier registration failed\n");
+			dev_err(vi->dev, "notifier registration failed %d\n", ret);
 			goto done;
 		}
 

include/media/mc_common.h

@@ -97,7 +97,7 @@ struct tegra_vi_graph_entity {
 	struct media_entity *entity;
 
 #if defined(NV_V4L2_ASYNC_CONNECTION_STRUCT_PRESENT) /* Linux 6.5 */
-	struct v4l2_async_connection asd;
+	struct v4l2_async_connection *asc;
 #else
 	struct v4l2_async_subdev asd;
 #endif