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mei: docs: add hdcp documentation 

1. Add a short ducumentation for MEI HDCP driver,
and fix DOC comments in drivers/misc/mei/hdcp/mei_hdcp.c

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tomas Winkler 2019-06-03 12:14:05 +03:00 committed by Greg Kroah-Hartman
parent 4e3d3b784a
commit 0475afd2a5
3 changed files with 37 additions and 7 deletions
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32
Documentation/driver-api/mei/hdcp.rst Normal file
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@ -0,0 +1,32 @@
.. SPDX-License-Identifier: GPL-2.0
HDCP:
=====
ME FW as a security engine provides the capability for setting up
HDCP2.2 protocol negotiation between the Intel graphics device and
an HDC2.2 sink.
ME FW prepares HDCP2.2 negotiation parameters, signs and encrypts them
according the HDCP 2.2 spec. The Intel graphics sends the created blob
to the HDCP2.2 sink.
Similarly, the HDCP2.2 sink's response is transferred to ME FW
for decryption and verification.
Once all the steps of HDCP2.2 negotiation are completed,
upon request ME FW will configure the port as authenticated and supply
the HDCP encryption keys to Intel graphics hardware.
mei_hdcp driver
---------------
.. kernel-doc:: drivers/misc/mei/hdcp/mei_hdcp.c
:doc: MEI_HDCP Client Driver
mei_hdcp api
------------
.. kernel-doc:: drivers/misc/mei/hdcp/mei_hdcp.c
:functions:

1
Documentation/driver-api/mei/mei-client-bus.rst
View File

@ -164,4 +164,5 @@ MEI Client Bus Drivers
.. toctree::
:maxdepth: 2
hdcp
nfc

11
drivers/misc/mei/hdcp/mei_hdcp.c
View File

@ -2,7 +2,7 @@
/*
* Copyright © 2019 Intel Corporation
*
* Mei_hdcp.c: HDCP client driver for mei bus
* mei_hdcp.c: HDCP client driver for mei bus
*
* Author:
* Ramalingam C <ramalingam.c@intel.com>
@ -11,12 +11,9 @@
/**
* DOC: MEI_HDCP Client Driver
*
* This is a client driver to the mei_bus to make the HDCP2.2 services of
* ME FW available for the interested consumers like I915.
*
* This module will act as a translation layer between HDCP protocol
* implementor(I915) and ME FW by translating HDCP2.2 authentication
* messages to ME FW command payloads and vice versa.
* The mei_hdcp driver acts as a translation layer between HDCP 2.2
* protocol implementer (I915) and ME FW by translating HDCP2.2
* negotiation messages to ME FW command payloads and vice versa.
*/
#include <linux/module.h>