linux-kernel - [PATCH v8 10/18] media: cadence: csi2rx: add get_frame

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Message-ID: <20251112115459.2479225-11-r-donadkar@ti.com>
Date: Wed, 12 Nov 2025 17:24:51 +0530
From: Rishikesh Donadkar <r-donadkar@...com>
To: <jai.luthra@...ux.dev>, <laurent.pinchart@...asonboard.com>,
	<mripard@...nel.org>
CC: <r-donadkar@...com>, <y-abhilashchandra@...com>, <devarsht@...com>,
	<s-jain1@...com>, <vigneshr@...com>, <mchehab@...nel.org>, <robh@...nel.org>,
	<krzk+dt@...nel.org>, <p.zabel@...gutronix.de>, <conor+dt@...nel.org>,
	<sakari.ailus@...ux.intel.com>, <hverkuil-cisco@...all.nl>,
	<tomi.valkeinen@...asonboard.com>, <jai.luthra@...asonboard.com>,
	<changhuang.liang@...rfivetech.com>, <jack.zhu@...rfivetech.com>,
	<sjoerd@...labora.com>, <dan.carpenter@...aro.org>,
	<hverkuil+cisco@...nel.org>, <linux-kernel@...r.kernel.org>,
	<linux-media@...r.kernel.org>, <devicetree@...r.kernel.org>
Subject: [PATCH v8 10/18] media: cadence: csi2rx: add get_frame_desc wrapper

From: Pratyush Yadav <p.yadav@...com>

J721E wrapper CSI2RX driver needs to get the frame descriptor from the
source to find out info about virtual channel. This driver itself does
not touch the routing or virtual channels in any way. So simply pass the
descriptor through from the source.

Signed-off-by: Pratyush Yadav <p.yadav@...com>
Signed-off-by: Jai Luthra <j-luthra@...com>
Reviewed-by: Jacopo Mondi <jacopo.mondi@...asonboard.com>
Reviewed-by: Changhuang Liang <changhuang.liang@...rfivetech.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Reviewed-by: Yemike Abhilash Chandra <y-abhilashchandra@...com>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Signed-off-by: Rishikesh Donadkar <r-donadkar@...com>
---
 drivers/media/platform/cadence/cdns-csi2rx.c | 24 ++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/drivers/media/platform/cadence/cdns-csi2rx.c b/drivers/media/platform/cadence/cdns-csi2rx.c
index 34da81893308b..3688077fa8347 100644
--- a/drivers/media/platform/cadence/cdns-csi2rx.c
+++ b/drivers/media/platform/cadence/cdns-csi2rx.c
@@ -229,6 +229,21 @@ static const struct csi2rx_fmt *csi2rx_get_fmt_by_code(u32 code)
 	return NULL;
 }
 
+static int csi2rx_get_frame_desc_from_source(struct csi2rx_priv *csi2rx,
+					     struct v4l2_mbus_frame_desc *fd)
+{
+	struct media_pad *remote_pad;
+
+	remote_pad = media_entity_remote_source_pad_unique(&csi2rx->subdev.entity);
+	if (!remote_pad) {
+		dev_err(csi2rx->dev, "No remote pad found for sink\n");
+		return -ENODEV;
+	}
+
+	return v4l2_subdev_call(csi2rx->source_subdev, pad, get_frame_desc,
+				remote_pad->index, fd);
+}
+
 static inline
 struct csi2rx_priv *v4l2_subdev_to_csi2rx(struct v4l2_subdev *subdev)
 {
@@ -611,12 +626,21 @@ int cdns_csi2rx_negotiate_ppc(struct v4l2_subdev *subdev, unsigned int pad,
 }
 EXPORT_SYMBOL_FOR_MODULES(cdns_csi2rx_negotiate_ppc, "j721e-csi2rx");
 
+static int csi2rx_get_frame_desc(struct v4l2_subdev *subdev, unsigned int pad,
+				 struct v4l2_mbus_frame_desc *fd)
+{
+	struct csi2rx_priv *csi2rx = v4l2_subdev_to_csi2rx(subdev);
+
+	return csi2rx_get_frame_desc_from_source(csi2rx, fd);
+}
+
 static const struct v4l2_subdev_pad_ops csi2rx_pad_ops = {
 	.enum_mbus_code	= csi2rx_enum_mbus_code,
 	.get_fmt	= v4l2_subdev_get_fmt,
 	.set_fmt	= csi2rx_set_fmt,
 	.enable_streams         = csi2rx_enable_streams,
 	.disable_streams        = csi2rx_disable_streams,
+	.get_frame_desc	= csi2rx_get_frame_desc,
 };
 
 static const struct v4l2_subdev_core_ops csi2rx_core_ops = {
-- 
2.34.1