intel · changchingyew · Jan 22, 2026
diff --git a/patch/v6.17_iot/0022-media-staging-ipu7-isys-csi2-get-link-frequency-from.patch b/patch/v6.17_iot/0022-media-staging-ipu7-isys-csi2-get-link-frequency-from.patch
@@ -0,0 +1,53 @@
+From b46c88f66951b03e155b98985f28b3d86e413179 Mon Sep 17 00:00:00 2001
+From: "Yew, Chang Ching" <chang.ching.yew@intel.com>
+Date: Thu, 22 Jan 2026 08:05:37 +0800
+Subject: [PATCH 1/3] media: staging: ipu7-isys-csi2: get link frequency from
+ pad
+
+In case driver does not have v4l2-control that stores link frequency,
+try to retrieve link frequency from pad
+
+Signed-off-by: Yew, Chang Ching <chang.ching.yew@intel.com>
+---
+ drivers/staging/media/ipu7/ipu7-isys-csi2.c | 18 +++++++++++++++++-
+ 1 file changed, 17 insertions(+), 1 deletion(-)
+
+diff --git a/drivers/staging/media/ipu7/ipu7-isys-csi2.c b/drivers/staging/media/ipu7/ipu7-isys-csi2.c
+index 9c16ae9a0e5bd..60e7856a5e2f9 100644
+--- a/drivers/staging/media/ipu7/ipu7-isys-csi2.c
++++ b/drivers/staging/media/ipu7/ipu7-isys-csi2.c
+@@ -51,6 +51,9 @@ static const u32 csi2_supported_codes[] = {
+ s64 ipu7_isys_csi2_get_link_freq(struct ipu7_isys_csi2 *csi2)
+ {
+ 	struct media_pad *src_pad;
++	struct v4l2_subdev *ext_sd;
++	struct device *dev;
++	s64 ret;
+
+ 	src_pad = media_entity_remote_source_pad_unique(&csi2->asd.sd.entity);
+ 	if (IS_ERR(src_pad)) {
+@@ -60,7 +63,20 @@ s64 ipu7_isys_csi2_get_link_freq(struct ipu7_isys_csi2 *csi2)
+ 		return PTR_ERR(src_pad);
+ 	}
+
+-	return v4l2_get_link_freq(src_pad, 0, 0);
++	ext_sd = media_entity_to_v4l2_subdev(src_pad->entity);
++	if (WARN(!ext_sd, "Failed to get subdev for %s\n", csi2->asd.sd.name))
++		return -ENODEV;
++
++	ret = v4l2_get_link_freq(ext_sd->ctrl_handler, 0, 0);
++	if (ret < 0) {
++		ret = v4l2_get_link_freq(src_pad, 0, 0);
++		if (ret < 0) {
++			dev_err(dev, "Failed to get link frequency for %s\n",
++				csi2->asd.sd.name);
++			return ret;
++		}
++	}
++	return ret;
+ }
+
+ static int csi2_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
+-- 
+2.51.1
+
diff --git a/patch/v6.17_iot/0023-media-staging-ipu7-get-source-pad-according-to-csi2-.patch b/patch/v6.17_iot/0023-media-staging-ipu7-get-source-pad-according-to-csi2-.patch
@@ -0,0 +1,103 @@
+From ed73cafe221b2466def6568ba92f66d53a365207 Mon Sep 17 00:00:00 2001
+From: "Yew, Chang Ching" <chang.ching.yew@intel.com>
+Date: Thu, 22 Jan 2026 08:08:39 +0800
+Subject: [PATCH 2/3] media: staging: ipu7: get source pad according to csi2 ep
+ fwnode
+
+Signed-off-by: He, Pengpeng <pengpengx.he@intel.com>
+Signed-off-by: Yew, Chang Ching <chang.ching.yew@intel.com>
+---
+ drivers/staging/media/ipu7/ipu7-isys.c | 50 +++++++++++++++++++-------
+ drivers/staging/media/ipu7/ipu7-isys.h |  1 +
+ 2 files changed, 39 insertions(+), 12 deletions(-)
+
+diff --git a/drivers/staging/media/ipu7/ipu7-isys.c b/drivers/staging/media/ipu7/ipu7-isys.c
+index 2bd8968a78cdf..74c45c3e7b5e4 100644
+--- a/drivers/staging/media/ipu7/ipu7-isys.c
++++ b/drivers/staging/media/ipu7/ipu7-isys.c
+@@ -55,23 +55,50 @@ isys_complete_ext_device_registration(struct ipu7_isys *isys,
+ 				      struct ipu7_isys_csi2_config *csi2)
+ {
+ 	struct device *dev = &isys->adev->auxdev.dev;
+-	unsigned int i;
++	int source_pad;
+ 	int ret;
+
+ 	v4l2_set_subdev_hostdata(sd, csi2);
+
+-	for (i = 0; i < sd->entity.num_pads; i++) {
+-		if (sd->entity.pads[i].flags & MEDIA_PAD_FL_SOURCE)
+-			break;
+-	}
++	if (csi2->ep) {
++		struct fwnode_handle *ep_source;
+
+-	if (i == sd->entity.num_pads) {
+-		dev_warn(dev, "no source pad in external entity\n");
+-		ret = -ENOENT;
+-		goto skip_unregister_subdev;
++		ep_source = fwnode_graph_get_remote_endpoint(csi2->ep);
++		if (!ep_source) {
++			dev_warn(dev, "no remote endpoint for subdev\n");
++			ret = -ENOENT;
++			goto skip_unregister_subdev;
++		}
++
++		source_pad = media_entity_get_fwnode_pad(&sd->entity, ep_source,
++						MEDIA_PAD_FL_SOURCE);
++
++		if (source_pad < 0) {
++			dev_warn(dev, "error in no acquire source pad in external entity\n");
++			ret = -ENOENT;
++			goto skip_unregister_subdev;
++		}
++
++		dev_dbg(&isys->adev->auxdev.dev, "%s: CSI2 ep %pfw\n", __func__,
++			csi2->ep);
++		dev_dbg(&isys->adev->auxdev.dev,
++			"%s: source pad %d for subdev %s\n", __func__, source_pad,
++			sd->name);
++
++		fwnode_handle_put(ep_source);
++	} else {
++		for (source_pad = 0; source_pad < sd->entity.num_pads; source_pad++) {
++			if (sd->entity.pads[source_pad].flags & MEDIA_PAD_FL_SOURCE)
++				break;
++		}
++		if (source_pad == sd->entity.num_pads) {
++			dev_warn(dev, "no source pad in external entity\n");
++			ret = -ENOENT;
++			goto skip_unregister_subdev;
++		}
+ 	}
+
+-	ret = media_create_pad_link(&sd->entity, i,
++	ret = media_create_pad_link(&sd->entity, source_pad,
+ 				    &isys->csi2[csi2->port].asd.sd.entity,
+ 				    0, MEDIA_LNK_FL_ENABLED |
+ 				    MEDIA_LNK_FL_IMMUTABLE);
+@@ -226,8 +253,7 @@ static int isys_notifier_init(struct ipu7_isys *isys)
+ 		s_asd->csi2.port = vep.base.port;
+ 		s_asd->csi2.nlanes = vep.bus.mipi_csi2.num_data_lanes;
+ 		s_asd->csi2.bus_type = vep.bus_type;
+-
+-		fwnode_handle_put(ep);
++		s_asd->csi2.ep = ep;
+
+ 		continue;
+
+diff --git a/drivers/staging/media/ipu7/ipu7-isys.h b/drivers/staging/media/ipu7/ipu7-isys.h
+index 17d4d56301691..55afb5b6e2d94 100644
+--- a/drivers/staging/media/ipu7/ipu7-isys.h
++++ b/drivers/staging/media/ipu7/ipu7-isys.h
+@@ -141,6 +141,7 @@ struct ipu7_isys_csi2_config {
+ 	unsigned int nlanes;
+ 	unsigned int port;
+ 	enum v4l2_mbus_type bus_type;
++	struct fwnode_handle *ep;
+ };
+
+ struct sensor_async_sd {
+-- 
+2.51.1
+
diff --git a/patch/v6.17_iot/0024-media-ipu7-Clean-csi2-fwnode-ep-when-destroying-v4l2.patch b/patch/v6.17_iot/0024-media-ipu7-Clean-csi2-fwnode-ep-when-destroying-v4l2.patch
@@ -0,0 +1,38 @@
+From c15faaa1927bd9aa2a690822cc147e12f47a10cd Mon Sep 17 00:00:00 2001
+From: hepengpx <pengpengx.he@intel.com>
+Date: Wed, 17 Dec 2025 15:22:07 +0800
+Subject: [PATCH 3/3] media: ipu7: Clean csi2 fwnode ep when destroying
+ v4l2_async_connection
+
+Signed-off-by: hepengpx <pengpengx.he@intel.com>
+Signed-off-by: Yew, Chang Ching <chang.ching.yew@intel.com>
+---
+ drivers/staging/media/ipu7/ipu7-isys.c | 9 +++++++++
+ 1 file changed, 9 insertions(+)
+
+diff --git a/drivers/staging/media/ipu7/ipu7-isys.c b/drivers/staging/media/ipu7/ipu7-isys.c
+index 74c45c3e7b5e4..d3de8ba02e9d6 100644
+--- a/drivers/staging/media/ipu7/ipu7-isys.c
++++ b/drivers/staging/media/ipu7/ipu7-isys.c
+@@ -202,9 +202,18 @@ static int isys_notifier_complete(struct v4l2_async_notifier *notifier)
+ 	return v4l2_device_register_subdev_nodes(&isys->v4l2_dev);
+ }
+
++static void isys_notifier_destroy(struct v4l2_async_connection *asc)
++{
++	struct sensor_async_sd *s_asd =
++		container_of(asc, struct sensor_async_sd, asc);
++
++	fwnode_handle_put(s_asd->csi2.ep);
++}
++
+ static const struct v4l2_async_notifier_operations isys_async_ops = {
+ 	.bound = isys_notifier_bound,
+ 	.complete = isys_notifier_complete,
++	.destroy = isys_notifier_destroy,
+ };
+
+ static int isys_notifier_init(struct ipu7_isys *isys)
+-- 
+2.51.1
+