diff options
| author | Isaac Scott <isaac.scott@ideasonboard.com> | 2025-10-29 18:03:18 +0000 |
|---|---|---|
| committer | Hans Verkuil <hverkuil+cisco@kernel.org> | 2025-11-13 10:57:52 +0100 |
| commit | fd3f646e1c9d783d1f4ef30e5376ccf315a8ae30 (patch) | |
| tree | e2dd234e17621c9f5aa8659b3b35f4cd2d6f7b3a /include/media | |
| parent | ca042de64800a0bcc3e0866e4efaa4a657e8ddc9 (diff) | |
media: v4l: Add helper to get number of active lanes via a pad
Sometimes, users will not use all of the MIPI CSI 2 lanes available when
connecting to the MIPI CSI receiver of their device. Add a helper
function that checks the mbus_config for the device driver to allow
users to define the number of active data lanes through the
get_mbus_config op.
If the driver does not implement this op, fall back to using the maximum
number of lanes available.
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Isaac Scott <isaac.scott@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>
Diffstat (limited to 'include/media')
| -rw-r--r-- | include/media/v4l2-common.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/include/media/v4l2-common.h b/include/media/v4l2-common.h index 5c0a7f6b5bb6..f8b1faced79c 100644 --- a/include/media/v4l2-common.h +++ b/include/media/v4l2-common.h @@ -581,6 +581,26 @@ int v4l2_fill_pixfmt_mp(struct v4l2_pix_format_mplane *pixfmt, u32 pixelformat, #ifdef CONFIG_MEDIA_CONTROLLER s64 v4l2_get_link_freq(const struct media_pad *pad, unsigned int mul, unsigned int div); + +/** + * v4l2_get_active_data_lanes - Get number of active data lanes from driver + * + * @pad: The transmitter's media pad. + * @max_data_lanes: The maximum number of active data lanes supported by + * the MIPI CSI link in hardware. + * + * This function is intended for obtaining the number of data lanes that are + * actively being used by the driver for a MIPI CSI-2 device on a given media pad. + * This information is derived from a mbus_config fetched from a device driver + * using the get_mbus_config v4l2_subdev pad op. + * + * Return: + * * >0: Number of active data lanes + * * %-EINVAL: Number of active data lanes is invalid, as it exceeds the maximum + * supported data lanes. + */ +int v4l2_get_active_data_lanes(const struct media_pad *pad, + unsigned int max_data_lanes); #endif void v4l2_simplify_fraction(u32 *numerator, u32 *denominator, |