[PATCH v2 07/23] media: rcar-csi2: Fix fwnode media link creation

[Steve Longerbeam <slongerbeam@gmail.com>]

rcsi2_notify_bound() passes the bound subdev's match fwnode to
media_entity_get_fwnode_pad() to determine the subdev's source
pad for creating the media link to it. When the bound subdev is
the adv748x-csi2 transmitter, this is in fact correctly the endpoint
fwnode. For other subdevices this likely will not be the case, the
asd match fwnode is usually not an endpoint fwnode but rather the
port parent fwnode. So rcar-csi2 will fail to get the correct source
pad for bound subdev's other than the adv748x.

To fix and make rcar-csi2 connect more generally to other subdevices,
replace the calls to media_entity_get_fwnode_pad() and
media_create_pad_link() with a call to media_create_fwnode_pad_links().

Fixes: 769afd212b160 ("media: rcar-csi2: add Renesas R-Car MIPI CSI-2 receiver driver")
Signed-off-by: Steve Longerbeam <slongerbeam@gmail.com>
---
 drivers/media/platform/rcar-vin/rcar-csi2.c | 23 +++++++++------------
 1 file changed, 10 insertions(+), 13 deletions(-)

diff --git a/drivers/media/platform/rcar-vin/rcar-csi2.c b/drivers/media/platform/rcar-vin/rcar-csi2.c
index faa9fb23a2e9..df6cb6d91d7e 100644
--- a/drivers/media/platform/rcar-vin/rcar-csi2.c
+++ b/drivers/media/platform/rcar-vin/rcar-csi2.c
@@ -738,23 +738,20 @@ static int rcsi2_notify_bound(struct v4l2_async_notifier *notifier,
 			      struct v4l2_async_subdev *asd)
 {
 	struct rcar_csi2 *priv = notifier_to_csi2(notifier);
-	int pad;
+	int ret;
 
-	pad = media_entity_get_fwnode_pad(&subdev->entity, asd->match.fwnode,
-					  MEDIA_PAD_FL_SOURCE);
-	if (pad < 0) {
-		dev_err(priv->dev, "Failed to find pad for %s\n", subdev->name);
-		return pad;
-	}
+	ret = media_create_fwnode_pad_links(&priv->subdev.entity.pads[0],
+					    dev_fwnode(priv->dev),
+					    &subdev->entity,
+					    dev_fwnode(subdev->dev),
+					    MEDIA_LNK_FL_ENABLED |
+					    MEDIA_LNK_FL_IMMUTABLE);
+	if (ret)
+		return ret;
 
 	priv->remote = subdev;
 
-	dev_dbg(priv->dev, "Bound %s pad: %d\n", subdev->name, pad);
-
-	return media_create_pad_link(&subdev->entity, pad,
-				     &priv->subdev.entity, 0,
-				     MEDIA_LNK_FL_ENABLED |
-				     MEDIA_LNK_FL_IMMUTABLE);
+	return 0;
 }
 
 static void rcsi2_notify_unbind(struct v4l2_async_notifier *notifier,
-- 
2.17.1