Commit 8d5b7009 authored by Alexander Usyskin's avatar Alexander Usyskin Committed by Lucas De Marchi
Browse files

mei: bus: add mei_cldev_mtu interface 



Add a new helper function that allows MEI client drivers
to query the maximum transmission unit (MTU) for a connected
MEI client.

This is useful for clients that need to transmit large payloads,
such as firmware blobs, allowing them to determine the maximum
message size that can be safely sent before starting transmission and
size of the buffer to allocate when receiving data.

Reviewed-by: default avatarMika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: default avatarAlexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: default avatarBadal Nilawar <badal.nilawar@intel.com>
Reviewed-by: default avatarUmesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
Signed-off-by: default avatarRodrigo Vivi <rodrigo.vivi@intel.com>
Acked-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://lore.kernel.org/r/20250905154953.3974335-2-badal.nilawar@intel.com


Signed-off-by: default avatarLucas De Marchi <lucas.demarchi@intel.com>
parent 187e16f6

drivers/misc/mei/bus.c

+13 −0
Original line number Diff line number Diff line
@@ -614,6 +614,19 @@ u8 mei_cldev_ver(const struct mei_cl_device *cldev) 
}

EXPORT_SYMBOL_GPL(mei_cldev_ver);



/**

 * mei_cldev_mtu - max message that client can send and receive

 *

 * @cldev: mei client device

 *

 * Return: mtu or 0 if client is not connected

 */

size_t mei_cldev_mtu(const struct mei_cl_device *cldev)

{

	return mei_cl_mtu(cldev->cl);

}

EXPORT_SYMBOL_GPL(mei_cldev_mtu);



/**

 * mei_cldev_enabled - check whether the device is enabled

 *

include/linux/mei_cl_bus.h

+1 −0
Original line number Diff line number Diff line
@@ -113,6 +113,7 @@ int mei_cldev_register_notif_cb(struct mei_cl_device *cldev, 
				mei_cldev_cb_t notif_cb);



u8 mei_cldev_ver(const struct mei_cl_device *cldev);

size_t mei_cldev_mtu(const struct mei_cl_device *cldev);



void *mei_cldev_get_drvdata(const struct mei_cl_device *cldev);

void mei_cldev_set_drvdata(struct mei_cl_device *cldev, void *data);