linux-kernel - Re: [PATCH v2 3/3] media: imx-mipi-csis: Get number of active lanes via mbus

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Message-ID: <aLhgNP0UMAj3Cpzi@lizhi-Precision-Tower-5810>
Date: Wed, 3 Sep 2025 11:35:16 -0400
From: Frank Li <Frank.li@....com>
To: Isaac Scott <isaac.scott@...asonboard.com>
Cc: laurent.pinchart@...asonboard.com, rmfrfs@...il.com, martink@...teo.de,
	kernel@...i.sm, mchehab@...nel.org, shawnguo@...nel.org,
	s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com,
	linux-media@...r.kernel.org, imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	hverkuil@...nel.org, nicolas.dufresne@...labora.com,
	sakari.ailus@...ux.intel.com, tomi.valkeinen@...asonboard.com,
	jonas@...boo.se, dan.scally+renesas@...asonboard.com,
	m.szyprowski@...sung.com, mehdi.djait@...ux.intel.com,
	niklas.soderlund+renesas@...natech.se
Subject: Re: [PATCH v2 3/3] media: imx-mipi-csis: Get number of active lanes
 via mbus_config

On Wed, Sep 03, 2025 at 11:22:42AM +0100, Isaac Scott wrote:
> 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

function need (), v4l2_get_active_data_lanes()

> 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, it will use the number of lanes defined in device tree.

remove "it will" to keep simple.

Frank
>
> 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 fc89325f2f94..985be511bcd0 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->bus.num_data_lanes = v4l2_get_active_data_lanes(csis->source.pad,
> +							      csis->max_data_lanes);
> +
>  	ret = mipi_csis_calculate_params(csis, csis_fmt);
>  	if (ret < 0)
>  		goto err_unlock;
> --
> 2.43.0
>