linux-kernel - [PATCH v6 4/4] media: imx-mipi-csis: Support active data lanes differing from maximum

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <20251029180321.153680-5-isaac.scott@ideasonboard.com>
Date: Wed, 29 Oct 2025 18:03:21 +0000
From: Isaac Scott <isaac.scott@...asonboard.com>
To: mchehab@...nel.org
Cc: rmfrfs@...il.com,
	laurent.pinchart@...asonboard.com,
	martink@...teo.de,
	kernel@...i.sm,
	shawnguo@...nel.org,
	s.hauer@...gutronix.de,
	kernel@...gutronix.de,
	festevam@...il.com,
	sakari.ailus@...ux.intel.com,
	linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org,
	Frank.Li@....com,
	Isaac Scott <isaac.scott@...asonboard.com>
Subject: [PATCH v6 4/4] media: imx-mipi-csis: Support active data lanes differing from maximum

Call on v4l2_get_active_data_lanes() to check if the driver reports that
the number of lanes actively used by the MIPI CSI transmitter differs to
the maximum defined in device tree.

If the number of active data lanes reported by the driver is invalid,
catch and return the error. If the operation is not supported, fall back
to the number of allowed data lanes.

Signed-off-by: Isaac Scott <isaac.scott@...asonboard.com>
---
 drivers/media/platform/nxp/imx-mipi-csis.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/media/platform/nxp/imx-mipi-csis.c b/drivers/media/platform/nxp/imx-mipi-csis.c
index 838a1ad123b5..4224ea2d80b6 100644
--- a/drivers/media/platform/nxp/imx-mipi-csis.c
+++ b/drivers/media/platform/nxp/imx-mipi-csis.c
@@ -1034,6 +1034,12 @@ 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);
 
+	ret = v4l2_get_active_data_lanes(csis->source.pad, csis->bus.num_data_lanes);
+	if (ret < 0)
+		goto err_unlock;
+
+	csis->num_data_lanes = ret;
+
 	ret = mipi_csis_calculate_params(csis, csis_fmt);
 	if (ret < 0)
 		goto err_unlock;
-- 
2.43.0