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]
Signed-off-by: Ramalingam C <ramalingam.c@xxxxxxxxx>
---
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 0b4e85511a25..be33906a68c1 100644
--- a/drivers/misc/mei/hdcp/mei_hdcp.c
+++ b/drivers/misc/mei/hdcp/mei_hdcp.c
@@ -33,10 +33,78 @@
#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 struct mei_cl_device *mei_cldev;
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. %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,
+ sizeof(session_init_out.r_tx));
+
+ return 0;
+}
+EXPORT_SYMBOL(mei_initiate_hdcp2_session);
+
static void
mei_cldev_state_notify_clients(struct mei_cl_device *cldev, bool enabled)
{
diff --git a/include/linux/mei_hdcp.h b/include/linux/mei_hdcp.h
index c8a8c12782d2..841ab8ffc302 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,
@@ -106,6 +107,9 @@ struct mei_hdcp_data {
int mei_cldev_register_notify(struct notifier_block *nb);
int mei_cldev_unregister_notify(struct notifier_block *nb);
int mei_cldev_poll_notification(void);
+int mei_initiate_hdcp2_session(struct mei_cl_device *cldev,
+ struct mei_hdcp_data *data,
+ struct hdcp2_ake_init *ake_data);
#else
static inline int mei_cldev_register_notify(struct notifier_block *nb)
{
@@ -119,5 +123,12 @@ static inline int mei_cldev_poll_notification(void)
{
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 /* IS_ENABLED(CONFIG_INTEL_MEI_HDCP) */
#endif /* defined (_LINUX_MEI_HDCP_H) */
--
2.7.4
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