[PATCH v6 34/35] misc/mei/hdcp: Enabling the HDCP authentication

[Ramalingam C]

Request to ME to configure a port as authenticated.

On Success, ME FW will mark the port as authenticated and provides
HDCP cipher with the encryption keys.

Enabling the Authentication can be requested once all stages of
HDCP2.2 authentication is completed by interacting with ME FW.

Only after this stage, driver can enable the HDCP encryption for
the port, through HW registers.

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:
  Rebased.
v6:
  No change.

Signed-off-by: Ramalingam C <ramalingam.c at intel.com>
---
 drivers/misc/mei/hdcp/mei_hdcp.c | 57 +++++++++++++++++++++++++++++++++++++++-
 1 file changed, 56 insertions(+), 1 deletion(-)

diff --git a/drivers/misc/mei/hdcp/mei_hdcp.c b/drivers/misc/mei/hdcp/mei_hdcp.c
index 7841fe94a96f..fdfdfb1724ec 100644
--- a/drivers/misc/mei/hdcp/mei_hdcp.c
+++ b/drivers/misc/mei/hdcp/mei_hdcp.c
@@ -624,6 +624,60 @@ static int mei_verify_mprime(struct mei_cl_device *cldev,
 	return 0;
 }
 
+/*
+ * mei_enable_hdcp_authentication:
+ *	Function to request ME FW to mark a port as authenticated.
+ *
+ * cldev		: Pointer for mei client device
+ * data		: Intel HW specific Data
+ *
+ * Returns 0 on Success, <0 on Failure
+ */
+static int mei_enable_hdcp_authentication(struct mei_cl_device *cldev,
+					  struct mei_hdcp_data *data)
+{
+	struct wired_cmd_enable_auth_in enable_auth_in = { { 0 } };
+	struct wired_cmd_enable_auth_out enable_auth_out = { { 0 } };
+	struct device *dev;
+	ssize_t byte;
+
+	if (!data)
+		return -EINVAL;
+
+	dev = &cldev->dev;
+
+	enable_auth_in.header.api_version = HDCP_API_VERSION;
+	enable_auth_in.header.command_id = WIRED_ENABLE_AUTH;
+	enable_auth_in.header.status = ME_HDCP_STATUS_SUCCESS;
+	enable_auth_in.header.buffer_len = WIRED_CMD_BUF_LEN_ENABLE_AUTH_IN;
+
+	enable_auth_in.port.integrated_port_type = data->port_type;
+	enable_auth_in.port.physical_port = data->port;
+	enable_auth_in.stream_type = data->streams[0].stream_type;
+
+	byte = mei_cldev_send(cldev, (u8 *)&enable_auth_in,
+			      sizeof(enable_auth_in));
+	if (byte < 0) {
+		dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
+		return byte;
+	}
+
+	byte = mei_cldev_recv(cldev, (u8 *)&enable_auth_out,
+			      sizeof(enable_auth_out));
+	if (byte < 0) {
+		dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
+		return byte;
+	}
+
+	if (enable_auth_out.header.status != ME_HDCP_STATUS_SUCCESS) {
+		dev_dbg(dev, "ME cmd 0x%08X failed. status: 0x%X\n",
+			WIRED_ENABLE_AUTH, enable_auth_out.header.status);
+		return -EIO;
+	}
+
+	return 0;
+}
+
 struct i915_hdcp_component_ops mei_hdcp_component_ops = {
 	.owner					= THIS_MODULE,
 	.initiate_hdcp2_session			= mei_initiate_hdcp2_session,
@@ -637,7 +691,8 @@ struct i915_hdcp_component_ops mei_hdcp_component_ops = {
 	.repeater_check_flow_prepare_ack	=
 					mei_repeater_check_flow_prepare_ack,
 	.verify_mprime				= mei_verify_mprime,
-	.enable_hdcp_authentication		= NULL,
+	.enable_hdcp_authentication		=
+					mei_enable_hdcp_authentication,
 	.close_hdcp_session			= NULL,
 };
 
-- 
2.7.4