[PATCH v2 10/42] misc/mei/hdcp: Initiate Wired HDCP2.2 Tx Session

[Winkler, Tomas]

> 
> Request ME FW to start the HDCP2.2 session for a intel port.
> Prepares payloads for command WIRED_INITIATE_HDCP2_SESSION and sent
> to ME FW.
> 
> On Success, ME FW will start a HDCP2.2 session for the port and provides the
> content for HDCP2.2 AKE_Init message.
> 
> v2:
>   Rebased.
> 
> Signed-off-by: Ramalingam C <ramalingam.c at intel.com>
> ---
>  drivers/misc/mei/hdcp/mei_hdcp.c | 73
> ++++++++++++++++++++++++++++++++++++++++
>  include/linux/mei_hdcp.h         | 11 ++++++
>  2 files changed, 84 insertions(+)
> 
> diff --git a/drivers/misc/mei/hdcp/mei_hdcp.c
> b/drivers/misc/mei/hdcp/mei_hdcp.c
> index 63f77800a6f7..516ad6a40616 100644
> --- a/drivers/misc/mei/hdcp/mei_hdcp.c
> +++ b/drivers/misc/mei/hdcp/mei_hdcp.c
> @@ -29,6 +29,7 @@
>  #include <linux/module.h>
>  #include <linux/slab.h>
>  #include <linux/uuid.h>
> +#include <drm/drm_connector.h>
> 
>  #include "mei_hdcp.h"
> 
> @@ -46,6 +47,78 @@ static inline bool
> mei_cldev_active_and_enabled(struct mei_cl_device *cldev)
>  	return mei_cldev_enabled(cldev);
>  }
> 
> +/**
> + * mei_initiate_hdcp2_session:
> + *	Function to start a Wired HDCP2.2 Tx Session with ME FW
> + *
> + * @data		: Intel HW specific Data
> + * @ake_data		: ptr to store AKE_Init
> + *
> + * Returns 0 on Success, <0 on Failure.
> + */
> +int mei_initiate_hdcp2_session(struct mei_hdcp_data *data,
> +			       struct hdcp2_ake_init *ake_data) {


You should use cldev as a first argument for all those functions 

> +	struct wired_cmd_initiate_hdcp2_session_in session_init_in = { { 0 }
> };
> +	struct wired_cmd_initiate_hdcp2_session_out
> +						session_init_out = { { 0 } };
> +	enum me_hdcp_status status;
> +	struct device *dev;
> +	ssize_t byte;
> +
> +	if (!data || !ake_data)
> +		return -EINVAL;
> +
> +	/* check for the mei_device enabled or not */
> +	if (!mei_cldev_active_and_enabled(data->cldev))
> +		return -ENODEV;
No reason cldev will be NULL here.

> +	dev = &data->cldev->dev;
> +
> +	/* Fill header details */
Those types of comments are redundant.
> +	session_init_in.header.api_version = HDCP_API_VERSION;
> +	session_init_in.header.command_id =
> WIRED_INITIATE_HDCP2_SESSION;
> +	session_init_in.header.status = ME_HDCP_STATUS_SUCCESS;
> +	session_init_in.header.buffer_len =
> +
> 	WIRED_CMD_BUF_LEN_INITIATE_HDCP2_SESSION_IN;
> +
> +	/* Fill in the In Data */
Those types of comments are redundant. 
> +	session_init_in.port.integrated_port_type = data->port_type;
> +	session_init_in.port.physical_port = data->port;
> +	session_init_in.protocol = (uint8_t)data->protocol;
> +
> +	/* Request to ME */
> +	byte = mei_cldev_send(data->cldev, (u8 *)&session_init_in,
> +			      sizeof(session_init_in));
> +	if (byte < 0) {
> +		dev_err(dev, "mei_cldev_send failed. %d\n", (int)byte);
> +		return byte;
> +	}
> +
> +	/* Response from ME */
> +	byte = mei_cldev_recv(data->cldev, (u8 *)&session_init_out,
> +			      sizeof(session_init_out));
> +	if (byte < 0) {
> +		dev_err(dev, "mei_cldev_recv failed. %d\n", (int)byte);
> +		return byte;
> +	}
> +
> +	status = (enum me_hdcp_status)session_init_out.header.status;
Useless cast
> +	if (status != ME_HDCP_STATUS_SUCCESS) {
> +		dev_err(dev, "ME cmd 0x%08X Failed. Status: 0x%X\n",
> +			WIRED_INITIATE_HDCP2_SESSION, status);
> +		return -1;
> +	}
> +
> +	ake_data->msg_id = HDCP_2_2_AKE_INIT;
> +	ake_data->tx_caps = session_init_out.tx_caps;
> +	memcpy(ake_data->r_tx, session_init_out.r_tx,
> +	       sizeof(session_init_out.r_tx));
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL(mei_initiate_hdcp2_session);
> +
>  static int mei_hdcp_probe(struct mei_cl_device *cldev,
>  			  const struct mei_cl_device_id *id)  { diff --git
> a/include/linux/mei_hdcp.h b/include/linux/mei_hdcp.h index
> 9a869d1cbd5d..c333528b9c1e 100644
> --- a/include/linux/mei_hdcp.h
> +++ b/include/linux/mei_hdcp.h
> @@ -24,6 +24,7 @@
>  #define _LINUX_MEI_HDCP_H
> 
>  #include <linux/mei_cl_bus.h>
> +#include <drm/drm_hdcp.h>
> 
>  /*
>   * Enumeration of the physical DDI available on the platform @@ -101,6
> +102,9 @@ int mei_hdcp_cldev_get_reference(void *client_data,
>  						       struct mei_cl_device
>  						       *cldev));
>  void mei_hdcp_cldev_put_reference(struct mei_cl_device *cldev);
> +
> +int mei_initiate_hdcp2_session(struct mei_hdcp_data *data,
> +			       struct hdcp2_ake_init *ake_data);
>  #else
>  static inline
>  int mei_hdcp_cldev_get_reference(void *client_data, @@ -114,5 +118,12
> @@ int mei_hdcp_cldev_get_reference(void *client_data,  static inline  void
> mei_hdcp_cldev_put_reference(struct mei_cl_device *cldev)  {}
> +
> +static inline
> +int mei_initiate_hdcp2_session(struct mei_hdcp_data *data,
> +			       struct hdcp2_ake_init *ake_data) {
> +	return -ENODEV;
> +}
>  #endif /* defined (CONFIG_INTEL_MEI_HDCP) */  #endif /* defined
> (_LINUX_MEI_HDCP_H) */
> --
> 2.7.4