[PATCH v3 08/40] misc/mei/hdcp: Initiate Wired HDCP2.2 Tx Session

[Usyskin, Alexander]

> -----Original Message-----
> From: C, Ramalingam
> Sent: Tuesday, April 03, 2018 16:57
> To: intel-gfx at lists.freedesktop.org; dri-devel at lists.freedesktop.org;
> seanpaul at chromium.org; daniel at ffwll.ch; chris at chris-wilson.co.uk;
> jani.nikula at linux.intel.com; Winkler, Tomas <tomas.winkler at intel.com>;
> Usyskin, Alexander <alexander.usyskin at intel.com>
> Cc: Vivi, Rodrigo <rodrigo.vivi at intel.com>; C, Ramalingam
> <ramalingam.c at intel.com>
> Subject: [PATCH v3 08/40] misc/mei/hdcp: Initiate Wired HDCP2.2 Tx Session
> 
> 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.
> v3:
>   cldev is add as a separate parameter [Tomas]
>   Redundant comment and typecast are removed [Tomas]
> 
> Signed-off-by: Ramalingam C <ramalingam.c at intel.com>
> ---
>  drivers/misc/mei/hdcp/mei_hdcp.c | 68
> ++++++++++++++++++++++++++++++++++++++++
>  include/linux/mei_hdcp.h         | 11 +++++++
>  2 files changed, 79 insertions(+)
> 
> diff --git a/drivers/misc/mei/hdcp/mei_hdcp.c
> b/drivers/misc/mei/hdcp/mei_hdcp.c
> index 2811a25f8c57..7caee0947761 100644
> --- a/drivers/misc/mei/hdcp/mei_hdcp.c
> +++ b/drivers/misc/mei/hdcp/mei_hdcp.c
> @@ -33,9 +33,77 @@
>  #include <linux/mei_cl_bus.h>
>  #include <linux/notifier.h>
>  #include <linux/mei_hdcp.h>
> +#include <drm/drm_connector.h>
> +
> +#include "mei_hdcp.h"
> 
>  static BLOCKING_NOTIFIER_HEAD(mei_cldev_notifier_list);
> 
> +/**
> + * mei_initiate_hdcp2_session:
> + *	Function to start a Wired HDCP2.2 Tx Session with ME FW
> + *
> + * @cldev		: Pointer for mei client device
> + * @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_cl_device *cldev,
> +			       struct mei_hdcp_data *data,
> +			       struct hdcp2_ake_init *ake_data)
> +{
> +	struct wired_cmd_initiate_hdcp2_session_in session_init_in = { { 0 }
> };
> +	struct wired_cmd_initiate_hdcp2_session_out
> +						session_init_out = { { 0 } };
> +	struct device *dev;
> +	ssize_t byte;
> +
> +	if (!data || !ake_data)
> +		return -EINVAL;
> +
> +	dev = &cldev->dev;
> +
> +	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;
> +
> +	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;
> +
> +	byte = mei_cldev_send(cldev, (u8 *)&session_init_in,
> +			      sizeof(session_init_in));
> +	if (byte < 0) {
> +		dev_dbg(dev, "mei_cldev_send failed. %d\n", (int)byte);
%zd don't require (int)
> +		return byte;
> +	}
> +
> +	byte = mei_cldev_recv(cldev, (u8 *)&session_init_out,
> +			      sizeof(session_init_out));
> +	if (byte < 0) {
> +		dev_dbg(dev, "mei_cldev_recv failed. %d\n", (int)byte);
%zd don't require (int)
> +		return byte;
> +	}
> +
> +	if (session_init_out.header.status != ME_HDCP_STATUS_SUCCESS) {
> +		dev_dbg(dev, "ME cmd 0x%08X Failed. Status: 0x%X\n",
> +			WIRED_INITIATE_HDCP2_SESSION,
> +			session_init_out.header.status);
> +		return -1;
It will be better to return some meaningful error code here.
> +	}
> +
> +	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);
> +
>  void mei_cldev_state_notify_clients(struct mei_cl_device *cldev, bool
> enabled)
>  {
>  	if (enabled)
> diff --git a/include/linux/mei_hdcp.h b/include/linux/mei_hdcp.h
> index 634c1a5bdf1e..bb4f27d3abcb 100644
> --- a/include/linux/mei_hdcp.h
> +++ b/include/linux/mei_hdcp.h
> @@ -28,6 +28,7 @@
>  #define _LINUX_MEI_HDCP_H
> 
>  #include <linux/mei_cl_bus.h>
> +#include <drm/drm_hdcp.h>
> 
>  enum mei_cldev_state {
>  	MEI_CLDEV_DISABLED,
> @@ -105,6 +106,9 @@ struct mei_hdcp_data {
>  #ifdef CONFIG_INTEL_MEI_HDCP
>  int mei_cldev_register_notify(struct notifier_block *nb);
>  int mei_cldev_unregister_notify(struct notifier_block *nb);
> +int mei_initiate_hdcp2_session(struct mei_cl_device *cldev,
> +			       struct mei_hdcp_data *data,
> +			       struct hdcp2_ake_init *ake_data);
>  #else
>  static int mei_cldev_register_notify(struct notifier_block *nb)
>  {
> @@ -114,5 +118,12 @@ static int mei_cldev_unregister_notify(struct
> notifier_block *nb)
>  {
>  	return -ENODEV;
>  }
> +static inline
> +int mei_initiate_hdcp2_session(struct mei_cl_device *cldev,
> +			       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