linux-kernel - [PATCH v3 3/3] media: imx-mipi-csis: Get number of active lanes via mbus

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Message-Id: <20250915-mbus-config-active-lanes-v3-3-97a1282a410b@ideasonboard.com>
Date: Mon, 15 Sep 2025 14:18:35 +0100
From: Isaac Scott <isaac.scott@...asonboard.com>
To: Mauro Carvalho Chehab <mchehab@...nel.org>, 
 Rui Miguel Silva <rmfrfs@...il.com>, 
 Laurent Pinchart <laurent.pinchart@...asonboard.com>, 
 Martin Kepplinger <martink@...teo.de>, Purism Kernel Team <kernel@...i.sm>, 
 Shawn Guo <shawnguo@...nel.org>, Sascha Hauer <s.hauer@...gutronix.de>, 
 Pengutronix Kernel Team <kernel@...gutronix.de>, 
 Fabio Estevam <festevam@...il.com>
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org, 
 imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org, 
 Isaac Scott <isaac.scott@...asonboard.com>
Subject: [PATCH v3 3/3] media: imx-mipi-csis: Get number of active lanes
 via mbus_config

The number of lanes actively used by a MIPI CSI transmitter may differ
from that which is defined in device tree. As such, call on
v4l2_get_active_data_lanes() to check if the driver reports a
differing number of lanes to device tree, and use that number of active
lanes.

If the number of active data lanes is invalid, or the op is not
supported, use the number of lanes defined in device tree.

Signed-off-by: Isaac Scott <isaac.scott@...asonboard.com>
---
 drivers/media/platform/nxp/imx-mipi-csis.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/media/platform/nxp/imx-mipi-csis.c b/drivers/media/platform/nxp/imx-mipi-csis.c
index 6afbedfe131e..d3424ad54b4e 100644
--- a/drivers/media/platform/nxp/imx-mipi-csis.c
+++ b/drivers/media/platform/nxp/imx-mipi-csis.c
@@ -967,6 +967,9 @@ static int mipi_csis_s_stream(struct v4l2_subdev *sd, int enable)
 	format = v4l2_subdev_state_get_format(state, CSIS_PAD_SINK);
 	csis_fmt = find_csis_format(format->code);
 
+	csis->num_data_lanes = v4l2_get_active_data_lanes(csis->source.pad,
+							  csis->bus.num_data_lanes);
+
 	ret = mipi_csis_calculate_params(csis, csis_fmt);
 	if (ret < 0)
 		goto err_unlock;

-- 
2.43.0