From: Sakari Ailus <sakari.ailus@linux.intel.com>
Date: Thu, 6 Nov 2025 09:56:40 +0000 (+0200)
Subject: media: ipu6: Obtain unique source pad from remote sub-device
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7c305850912ea153808b95475ce5acd0f934891d;p=thirdparty%2Fkernel%2Flinux.git

media: ipu6: Obtain unique source pad from remote sub-device

Obtain unique source pad from a remote sub-device, instead of the first
one. This means that only one link may be active at stream start. There's
no functional change in practice, unless multiple CSI-2 transmitters are
directly connected to the receiver.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Reviewed-by: Bingbu Cao <bingbu.cao@intel.com>
Tested-by: Mehdi Djait <mehdi.djait@linux.intel.com> # Dell XPS 9315
Reviewed-by: Mehdi Djait <mehdi.djait@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>
---

diff --git a/drivers/media/pci/intel/ipu6/ipu6-isys-video.c b/drivers/media/pci/intel/ipu6/ipu6-isys-video.c
index 54d861aca0088..1d58e321bda72 100644
--- a/drivers/media/pci/intel/ipu6/ipu6-isys-video.c
+++ b/drivers/media/pci/intel/ipu6/ipu6-isys-video.c
@@ -1204,10 +1204,10 @@ int ipu6_isys_setup_video(struct ipu6_isys_video *av,
 
 	remote_sd = media_entity_to_v4l2_subdev(remote_pad->entity);
 	asd = to_ipu6_isys_subdev(remote_sd);
-	source_pad = media_pad_remote_pad_first(&remote_pad->entity->pads[0]);
-	if (!source_pad) {
+	source_pad = media_pad_remote_pad_unique(&remote_pad->entity->pads[0]);
+	if (IS_ERR(source_pad)) {
 		dev_dbg(dev, "No external source entity\n");
-		return -ENODEV;
+		return PTR_ERR(source_pad);
 	}
 
 	*source_entity = source_pad->entity;