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Commit a37fb1e4 authored by Ramalingam C's avatar Ramalingam C Committed by Daniel Vetter
Browse files

misc/mei/hdcp: Initiate Wired HDCP2.2 Tx Session 



Request ME FW to start the HDCP2.2 session for an intel port.
Prepares payloads for command WIRED_INITIATE_HDCP2_SESSION and sends
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]
v4:
  %zd is used for size [Alexander]
  %s/return -1/return -EIO [Alexander]
  Spellings in commit msg is fixed [Uma]
v5: Rebased.
v6:
  Collected the rb-ed by.
  Realigning the patches in the series.
v7:
  Adjust to the new mei interface.
  Fix for kdoc.
v8:
  K-Doc Addition.
  memcpy for const length.
v9:
  s/mei_hdcp_ddi/mei_fw_ddi
  s/i915_port/mei_i915_port [Tomas]
  renamed func as mei_hdcp_* [Tomas]
  Instead of macro, inline func for ddi index is used. [Tomas]
v10:
  Switch case for the coversion between i915_port to mei_ddi [Tomas]
  Kernel doc fix.
v11:
  mei_hdcp_ops is defined as const. [Tomas]

Signed-off-by: default avatarRamalingam C <ramalingam.c@intel.com>
Signed-off-by: default avatarTomas Winkler <tomas.winkler@intel.com>
Reviewed-by: default avatarUma Shankar <uma.shankar@intel.com>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/1550772730-23280-5-git-send-email-ramalingam.c@intel.com
parent cf8ecce2

drivers/misc/mei/hdcp/mei_hdcp.c

+94 −0
Original line number Diff line number Diff line
@@ -23,6 +23,100 @@ 
#include <linux/slab.h>

#include <linux/uuid.h>

#include <linux/mei_cl_bus.h>

#include <drm/drm_connector.h>

#include <drm/i915_component.h>

#include <drm/i915_mei_hdcp_interface.h>



#include "mei_hdcp.h"



static inline u8 mei_get_ddi_index(enum port port)

{

	switch (port) {

	case PORT_A:

		return MEI_DDI_A;

	case PORT_B ... PORT_F:

		return (u8)port;

	default:

		return MEI_DDI_INVALID_PORT;

	}

}



/**

 * mei_hdcp_initiate_session() - Initiate a Wired HDCP2.2 Tx Session in ME FW

 * @dev: device corresponding to the mei_cl_device

 * @data: Intel HW specific hdcp data

 * @ake_data: AKE_Init msg output.

 *

 * Return:  0 on Success, <0 on Failure.

 */

static int

mei_hdcp_initiate_session(struct device *dev, struct hdcp_port_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 mei_cl_device *cldev;

	ssize_t byte;



	if (!dev || !data || !ake_data)

		return -EINVAL;



	cldev = to_mei_cl_device(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 = mei_get_ddi_index(data->port);

	session_init_in.protocol = 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. %zd\n", byte);

		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. %zd\n", byte);

		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 -EIO;

	}



	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, HDCP_2_2_RTX_LEN);



	return 0;

}



static const __attribute__((unused))

struct i915_hdcp_component_ops mei_hdcp_ops = {

	.owner = THIS_MODULE,

	.initiate_hdcp2_session = mei_hdcp_initiate_session,

	.verify_receiver_cert_prepare_km = NULL,

	.verify_hprime = NULL,

	.store_pairing_info = NULL,

	.initiate_locality_check = NULL,

	.verify_lprime = NULL,

	.get_session_key = NULL,

	.repeater_check_flow_prepare_ack = NULL,

	.verify_mprime = NULL,

	.enable_hdcp_authentication = NULL,

	.close_hdcp_session = NULL,

};



static int mei_hdcp_probe(struct mei_cl_device *cldev,

			  const struct mei_cl_device_id *id)

drivers/misc/mei/hdcp/mei_hdcp.h

+11 −0
Original line number Diff line number Diff line
@@ -363,4 +363,15 @@ struct wired_cmd_repeater_auth_stream_req_out { 
	struct hdcp_port_id	port;

} __packed;



enum mei_fw_ddi {

	MEI_DDI_INVALID_PORT = 0x0,



	MEI_DDI_B = 1,

	MEI_DDI_C,

	MEI_DDI_D,

	MEI_DDI_E,

	MEI_DDI_F,

	MEI_DDI_A = 7,

	MEI_DDI_RANGE_END = MEI_DDI_A,

};

#endif /* __MEI_HDCP_H__ */