[Intel-gfx] [PATCH v14 19/33] misc/mei/hdcp: Client driver for HDCP application

[Winkler, Tomas]

> 
> ME FW contributes a vital role in HDCP2.2 authentication.
> HDCP2.2 driver needs to communicate to ME FW for each step of the
> HDCP2.2 authentication.
> 
> ME FW prepare and HDCP2.2 authentication  parameters and encrypt them as
> per spec. With such parameter Driver prepares HDCP2.2 auth messages and
> communicate with HDCP2.2 sink.
> 
> Similarly HDCP2.2 sink's response is shared with ME FW for decrypt and
> verification.
> 
> Once All the steps of HDCP2.2 authentications are complete on driver's request
> ME FW will configure the port as authenticated and supply the HDCP keys to
> the Gen HW for encryption.
> 
> Only after this stage HDCP2.2 driver can start the HDCP2.2 encryption for a
> port.
> 
> ME FW is interfaced to kernel through MEI Bus Driver. To obtain the
> HDCP2.2 services from the ME FW through MEI Bus driver MEI Client Driver is
> developed.
> 
> v2:
>   hdcp files are moved to drivers/misc/mei/hdcp/ [Tomas]
> v3:
>   Squashed the Kbuild support [Tomas]
>   UUID renamed and Module License is modified [Tomas]
>   drv_data is set to null at remove [Tomas]
> v4:
>   Module name is changed to "MEI HDCP"
>   I915 Selects the MEI_HDCP
> v5:
>   Remove redundant text from the License header
>   Fix malformed licence
>   Removed the drv_data resetting.
> v6:
>   K-Doc addition. [Tomas]
> v7:
>   %s/UUID_LE/GUID_INIT [Tomas]
>   GPL Ver is 2.0 than 2.0+ [Tomas]
> 
> Signed-off-by: Ramalingam C <ramalingam.c at intel.com>
> Signed-off-by: Tomas Winkler <tomas.winkler at intel.com>
> Acked-by: Tomas Winkler <tomas.winkler at intel.com>
> ---
>  drivers/misc/mei/Kconfig         |  7 +++++
>  drivers/misc/mei/Makefile        |  2 ++
>  drivers/misc/mei/hdcp/Makefile   |  7 +++++
>  drivers/misc/mei/hdcp/mei_hdcp.c | 64
> ++++++++++++++++++++++++++++++++++++++++
>  4 files changed, 80 insertions(+)
>  create mode 100644 drivers/misc/mei/hdcp/Makefile  create mode 100644
> drivers/misc/mei/hdcp/mei_hdcp.c
> 
> diff --git a/drivers/misc/mei/Kconfig b/drivers/misc/mei/Kconfig index
> c49e1d2269af..64a7b3483895 100644
> --- a/drivers/misc/mei/Kconfig
> +++ b/drivers/misc/mei/Kconfig
> @@ -43,3 +43,10 @@ config INTEL_MEI_TXE
> 
>  	  Supported SoCs:
>  	  Intel Bay Trail
> +
> +config INTEL_MEI_HDCP
> +	tristate "Intel HDCP2.2 services of ME Interface"
> +	select INTEL_MEI_ME
> +	depends on DRM_I915
> +	help
> +	  MEI Support for HDCP2.2 Services on Intel platforms.

Usually we need around 4 lines of doc, 
When this should be selected?