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mei: bus: add mei_cldev_mtu interface

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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: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Badal Nilawar <badal.nilawar@intel.com>
Reviewed-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://lore.kernel.org/r/20250905154953.3974335-2-badal.nilawar@intel.com
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
This commit is contained in:
Alexander Usyskin
2025-09-05 21:19:45 +05:30
committed by Lucas De Marchi
parent 187e16f69d
commit 8d5b7009aa
2 changed files with 14 additions and 0 deletions
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13
drivers/misc/mei/bus.c
View File

@@ -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
*

1
include/linux/mei_cl_bus.h
View File

@@ -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);