[PATCH v14 30/33] misc/mei/hdcp: Enabling the HDCP authentication

[Winkler, Tomas]

> 
> Request to ME to configure a port as authenticated.
> 
> On Success, ME FW will mark the port as authenticated and provides HDCP
> cipher with the encryption keys.
> 
> Enabling the Authentication can be requested once all stages of
> HDCP2.2 authentication is completed by interacting with ME FW.
> 
> Only after this stage, driver can enable the HDCP encryption for the port,
> through HW registers.
> 
> v2: Rebased.
> v3:
>   cldev is passed as first parameter [Tomas]
>   Redundant comments and cast are removed [Tomas]
> v4:
>   %zd for ssize_t [Alexander]
>   %s/return -1/return -EIO [Alexander]
>   Style and typos fixed [Uma]
> v5: Rebased.
> v6:
>   Collected the Rb-ed by.
>   Rebased.
> v7:
>   Adjust to the new mei interface.
>   Fix for Kdoc.
> v8:
>   K-Doc addition. [Tomas]
> v9:
>   renamed func as mei_hdcp_* [Tomas]
>   Inline function is defined for DDI index [Tomas]
> v10:
>   K-Doc fix. [Tomas]
> 
> Signed-off-by: Ramalingam C <ramalingam.c at intel.com>
> Reviewed-by: Uma Shankar <uma.shankar at intel.com>
> Acked-by: Tomas Winkler <tomas.winkler at intel.com>
LGTM

> ---
>  drivers/misc/mei/hdcp/mei_hdcp.c | 55
> +++++++++++++++++++++++++++++++++++++++-
>  1 file changed, 54 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/misc/mei/hdcp/mei_hdcp.c
> b/drivers/misc/mei/hdcp/mei_hdcp.c
> index 721376fc9bf1..d8e04e0621a1 100644
> --- a/drivers/misc/mei/hdcp/mei_hdcp.c
> +++ b/drivers/misc/mei/hdcp/mei_hdcp.c
> @@ -605,6 +605,59 @@ static int mei_hdcp_verify_mprime(struct device
> *dev,
>  	return 0;
>  }
> 
> +/**
> + * mei_hdcp_enable_authentication() - Mark a port as authenticated
> + * through ME FW
> + * @dev: device corresponding to the mei_cl_device
> + * @data: Intel HW specific hdcp data
> + *
> + * Return: 0 on Success, <0 on Failure
> + */
> +static int mei_hdcp_enable_authentication(struct device *dev,
> +					  struct hdcp_port_data *data)
> +{
> +	struct wired_cmd_enable_auth_in enable_auth_in = { { 0 } };
> +	struct wired_cmd_enable_auth_out enable_auth_out = { { 0 } };
> +	struct mei_cl_device *cldev;
> +	ssize_t byte;
> +
> +	if (!dev || !data)
> +		return -EINVAL;
> +
> +	cldev = to_mei_cl_device(dev);
> +
> +	enable_auth_in.header.api_version = HDCP_API_VERSION;
> +	enable_auth_in.header.command_id = WIRED_ENABLE_AUTH;
> +	enable_auth_in.header.status = ME_HDCP_STATUS_SUCCESS;
> +	enable_auth_in.header.buffer_len =
> WIRED_CMD_BUF_LEN_ENABLE_AUTH_IN;
> +
> +	enable_auth_in.port.integrated_port_type = data->port_type;
> +	enable_auth_in.port.physical_port = mei_get_ddi_index(data->port);
> +	enable_auth_in.stream_type = data->streams[0].stream_type;
> +
> +	byte = mei_cldev_send(cldev, (u8 *)&enable_auth_in,
> +			      sizeof(enable_auth_in));
> +	if (byte < 0) {
> +		dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
> +		return byte;
> +	}
> +
> +	byte = mei_cldev_recv(cldev, (u8 *)&enable_auth_out,
> +			      sizeof(enable_auth_out));
> +	if (byte < 0) {
> +		dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
> +		return byte;
> +	}
> +
> +	if (enable_auth_out.header.status != ME_HDCP_STATUS_SUCCESS) {
> +		dev_dbg(dev, "ME cmd 0x%08X failed. status: 0x%X\n",
> +			WIRED_ENABLE_AUTH,
> enable_auth_out.header.status);
> +		return -EIO;
> +	}
> +
> +	return 0;
> +}
> +
>  static __attribute__((unused))
>  struct i915_hdcp_component_ops mei_hdcp_ops = {
>  	.owner = THIS_MODULE,
> @@ -619,7 +672,7 @@ struct i915_hdcp_component_ops mei_hdcp_ops = {
>  	.repeater_check_flow_prepare_ack =
>  				mei_hdcp_repeater_check_flow_prepare_ack,
>  	.verify_mprime = mei_hdcp_verify_mprime,
> -	.enable_hdcp_authentication = NULL,
> +	.enable_hdcp_authentication = mei_hdcp_enable_authentication,
>  	.close_hdcp_session = NULL,
>  };
> 
> --
> 2.7.4