[Intel-gfx] [PATCH v14 31/33] misc/mei/hdcp: Closing wired HDCP2.2 Tx Session

[Winkler, Tomas]

> Request the ME to terminate the HDCP2.2 session for a port.
> 
> On Success, ME FW will mark the intel port as Deauthenticated and terminate
> the wired HDCP2.2 Tx session started due to the cmd
> WIRED_INITIATE_HDCP2_SESSION.
> 
> 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:
>   Extra line is removed.
> 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 d8e04e0621a1..2afc7d31dacc 100644
> --- a/drivers/misc/mei/hdcp/mei_hdcp.c
> +++ b/drivers/misc/mei/hdcp/mei_hdcp.c
> @@ -658,6 +658,59 @@ static int mei_hdcp_enable_authentication(struct
> device *dev,
>  	return 0;
>  }
> 
> +/**
> + * mei_hdcp_close_session() - Close the Wired HDCP Tx session of ME FW per
> port.
> + * This also disables the authenticated state of the port.
> + * @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_close_session(struct device *dev, struct hdcp_port_data *data)
> +{
> +	struct wired_cmd_close_session_in session_close_in = { { 0 } };
> +	struct wired_cmd_close_session_out session_close_out = { { 0 } };
> +	struct mei_cl_device *cldev;
> +	ssize_t byte;
> +
> +	if (!dev || !data)
> +		return -EINVAL;
> +
> +	cldev = to_mei_cl_device(dev);
> +
> +	session_close_in.header.api_version = HDCP_API_VERSION;
> +	session_close_in.header.command_id = WIRED_CLOSE_SESSION;
> +	session_close_in.header.status = ME_HDCP_STATUS_SUCCESS;
> +	session_close_in.header.buffer_len =
> +				WIRED_CMD_BUF_LEN_CLOSE_SESSION_IN;
> +
> +	session_close_in.port.integrated_port_type = data->port_type;
> +	session_close_in.port.physical_port = mei_get_ddi_index(data->port);
> +
> +	byte = mei_cldev_send(cldev, (u8 *)&session_close_in,
> +			      sizeof(session_close_in));
> +	if (byte < 0) {
> +		dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
> +		return byte;
> +	}
> +
> +	byte = mei_cldev_recv(cldev, (u8 *)&session_close_out,
> +			      sizeof(session_close_out));
> +	if (byte < 0) {
> +		dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
> +		return byte;
> +	}
> +
> +	if (session_close_out.header.status != ME_HDCP_STATUS_SUCCESS) {
> +		dev_dbg(dev, "Session Close Failed. status: 0x%X\n",
> +			session_close_out.header.status);
> +		return -EIO;
> +	}
> +
> +	return 0;
> +}
> +
>  static __attribute__((unused))
>  struct i915_hdcp_component_ops mei_hdcp_ops = {
>  	.owner = THIS_MODULE,
> @@ -673,7 +726,7 @@ struct i915_hdcp_component_ops mei_hdcp_ops = {
>  				mei_hdcp_repeater_check_flow_prepare_ack,
>  	.verify_mprime = mei_hdcp_verify_mprime,
>  	.enable_hdcp_authentication = mei_hdcp_enable_authentication,
> -	.close_hdcp_session = NULL,
> +	.close_hdcp_session = mei_hdcp_close_session,
>  };
> 
>  static int mei_hdcp_probe(struct mei_cl_device *cldev,
> --
> 2.7.4