[PATCH 20/43] misc/mei/hdcp: Enabling the HDCP authentication

Ramalingam C
2018-02-14T14:20:33Z

Request to ME to configure a port as authenticated.

On Success, ME FW will mark th eport as authenticated and provides
HDCP chiper of the port with the encryption keys.

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

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

Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
---
drivers/misc/mei/mei_hdcp.c | 61 +++++++++++++++++++++++++++++++++++++++++++++
include/linux/mei_hdcp.h | 5 ++++
2 files changed, 66 insertions(+)

diff --git a/drivers/misc/mei/mei_hdcp.c b/drivers/misc/mei/mei_hdcp.c
index d950361206e2..030c1604eb57 100644
--- a/drivers/misc/mei/mei_hdcp.c
+++ b/drivers/misc/mei/mei_hdcp.c
@@ -712,6 +712,67 @@ int mei_verify_mprime(struct mei_hdcp_data *data,
}
EXPORT_SYMBOL(mei_verify_mprime);

+/**
+ * mei_enable_hdcp_authentication:
+ * Function to request ME FW to mark a port as authenticated.
+ *
+ * @data : Intel HW specific Data
+ *
+ * Returns 0 on Success, <0 on Failure
+ */
+int mei_enable_hdcp_authentication(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 } };
+ enum me_status status;
+ struct device *dev;
+ ssize_t byte;
+
+ if (!data)
+ return -EINVAL;
+
+ if (!mei_cldev_active_and_enabled(data->cldev))
+ return -ENODEV;
+
+ dev = &data->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;
+
+ /* Fill in the In Data */
+ 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;
+
+ /* Request to ME */
+ byte = mei_cldev_send(data->cldev, (u8 *)&enable_auth_in,
+ sizeof(enable_auth_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 *)&enable_auth_out,
+ sizeof(enable_auth_out));
+ if (byte < 0) {
+ dev_err(dev, "mei_cldev_recv failed. %d\n", (int)byte);
+ return byte;
+ }
+
+ status = (enum me_status)enable_auth_out.header.status;
+ if (status != ME_HDCP_STATUS_SUCCESS) {
+ dev_err(dev, "ME cmd 0x%08X failed. status: 0x%X\n",
+ WIRED_ENABLE_AUTH, status);
+ return -1;
+ }
+ return 0;
+}
+EXPORT_SYMBOL(mei_enable_hdcp_authentication);
+
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 560fc62b2b41..cb8bf3b0f022 100644
--- a/include/linux/mei_hdcp.h
+++ b/include/linux/mei_hdcp.h
@@ -128,6 +128,7 @@ mei_repeater_check_flow_prepare_ack(struct mei_hdcp_data *data,
struct hdcp2_rep_send_ack *rep_send_ack);
int mei_verify_mprime(struct mei_hdcp_data *data,
struct hdcp2_rep_stream_ready *stream_ready);
+int mei_enable_hdcp_authentication(struct mei_hdcp_data *data);
#else
static inline
int mei_hdcp_cldev_get_reference(void *client_data,
@@ -201,5 +202,9 @@ int mei_verify_mprime(struct mei_hdcp_data *data,
{
return -ENODEV;
}
+static inline int mei_enable_hdcp_authentication(struct mei_hdcp_data *data)
+{
+ return -ENODEV;
+}
#endif /* defined (CONFIG_INTEL_MEI_HDCP) */
#endif /* defined (_LINUX_MEI_HDCP_H) */