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Commit 682932f3 authored by Ramalingam C's avatar Ramalingam C Committed by Daniel Vetter
Browse files

misc/mei/hdcp: Initiate Locality check 



Requests ME to start the second stage of HDCP2.2 authentication,
called Locality Check.

On Success, ME FW will provide LC_Init message to send to hdcp sink.

v2: Rebased.
v3:
  cldev is passed as first parameter [Tomas]
  Redundant comments and cast are removed [Tomas]
v4:
  %zd used for ssize_t [Alexander]
  %s/return -1/return -EIO [Alexander]
  Style fixed [Uma]
v5: Rebased.
v6:
  Collected the Rb-ed by.
  Rebasing.
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]
v11:
  Rebased.

Signed-off-by: default avatarRamalingam C <ramalingam.c@intel.com>
Reviewed-by: default avatarUma Shankar <uma.shankar@intel.com>
Acked-by: default avatarTomas Winkler <tomas.winkler@intel.com>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/1550772730-23280-9-git-send-email-ramalingam.c@intel.com
parent 6a1a00a3

drivers/misc/mei/hdcp/mei_hdcp.c

+56 −1
Original line number Diff line number Diff line
@@ -296,6 +296,61 @@ mei_hdcp_store_pairing_info(struct device *dev, struct hdcp_port_data *data, 
	return 0;

}



/**

 * mei_hdcp_initiate_locality_check() - Prepare LC_Init

 * @dev: device corresponding to the mei_cl_device

 * @data: Intel HW specific hdcp data

 * @lc_init_data: LC_Init msg output

 *

 * Return: 0 on Success, <0 on Failure

 */

static int

mei_hdcp_initiate_locality_check(struct device *dev,

				 struct hdcp_port_data *data,

				 struct hdcp2_lc_init *lc_init_data)

{

	struct wired_cmd_init_locality_check_in lc_init_in = { { 0 } };

	struct wired_cmd_init_locality_check_out lc_init_out = { { 0 } };

	struct mei_cl_device *cldev;

	ssize_t byte;



	if (!dev || !data || !lc_init_data)

		return -EINVAL;



	cldev = to_mei_cl_device(dev);



	lc_init_in.header.api_version = HDCP_API_VERSION;

	lc_init_in.header.command_id = WIRED_INIT_LOCALITY_CHECK;

	lc_init_in.header.status = ME_HDCP_STATUS_SUCCESS;

	lc_init_in.header.buffer_len = WIRED_CMD_BUF_LEN_INIT_LOCALITY_CHECK_IN;



	lc_init_in.port.integrated_port_type = data->port_type;

	lc_init_in.port.physical_port = mei_get_ddi_index(data->port);



	byte = mei_cldev_send(cldev, (u8 *)&lc_init_in, sizeof(lc_init_in));

	if (byte < 0) {

		dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);

		return byte;

	}



	byte = mei_cldev_recv(cldev, (u8 *)&lc_init_out, sizeof(lc_init_out));

	if (byte < 0) {

		dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);

		return byte;

	}



	if (lc_init_out.header.status != ME_HDCP_STATUS_SUCCESS) {

		dev_dbg(dev, "ME cmd 0x%08X Failed. status: 0x%X\n",

			WIRED_INIT_LOCALITY_CHECK, lc_init_out.header.status);

		return -EIO;

	}



	lc_init_data->msg_id = HDCP_2_2_LC_INIT;

	memcpy(lc_init_data->r_n, lc_init_out.r_n, HDCP_2_2_RN_LEN);



	return 0;

}



static const __attribute__((unused))

struct i915_hdcp_component_ops mei_hdcp_ops = {

	.owner = THIS_MODULE,
@@ -304,7 +359,7 @@ struct i915_hdcp_component_ops mei_hdcp_ops = { 
				mei_hdcp_verify_receiver_cert_prepare_km,

	.verify_hprime = mei_hdcp_verify_hprime,

	.store_pairing_info = mei_hdcp_store_pairing_info,

	.initiate_locality_check = NULL,

	.initiate_locality_check = mei_hdcp_initiate_locality_check,

	.verify_lprime = NULL,

	.get_session_key = NULL,

	.repeater_check_flow_prepare_ack = NULL,