[PATCH v10 25/40] misc/mei/hdcp: Initiate Wired HDCP2.2 Tx Session

Ramalingam C
2019-01-31T06:59:41Z

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.

Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
---
drivers/misc/mei/hdcp/mei_hdcp.c | 82 ++++++++++++++++++++++++++++++++++++++++
drivers/misc/mei/hdcp/mei_hdcp.h | 28 ++++++++++++++
2 files changed, 110 insertions(+)

diff --git a/drivers/misc/mei/hdcp/mei_hdcp.c b/drivers/misc/mei/hdcp/mei_hdcp.c
index ca5010ad7dd7..534d29c8ee86 100644
--- a/drivers/misc/mei/hdcp/mei_hdcp.c
+++ b/drivers/misc/mei/hdcp/mei_hdcp.c
@@ -23,6 +23,88 @@
#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"
+
+/**
+ * mei_initiate_hdcp2_session() - Initiate a Wired HDCP2.2 Tx Session in ME FW
+ * @dev: device corresponding to the mei_cl_device
+ * @hdcp_data: Intel HW specific hdcp data
+ * @ake_data: AKE_Init msg output.
+ *
+ * Return: 0 on Success, <0 on Failure.
+ */
+static int
+mei_initiate_hdcp2_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 = (u8)GET_MEI_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 __attribute__((unused))
+struct i915_hdcp_component_ops mei_hdcp_ops = {
+ .owner = THIS_MODULE,
+ .initiate_hdcp2_session = mei_initiate_hdcp2_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)
diff --git a/drivers/misc/mei/hdcp/mei_hdcp.h b/drivers/misc/mei/hdcp/mei_hdcp.h
index 582a7e27ae29..f831db3cbd54 100644
--- a/drivers/misc/mei/hdcp/mei_hdcp.h
+++ b/drivers/misc/mei/hdcp/mei_hdcp.h
@@ -363,4 +363,32 @@ struct wired_cmd_repeater_auth_stream_req_out {
struct hdcp_port_id port;
} __packed;

+enum mei_hdcp_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,
+};
+
+enum i915_port {
+ PORT_NONE = -1,
+
+ PORT_A = 0,
+ PORT_B,
+ PORT_C,
+ PORT_D,
+ PORT_E,
+ PORT_F,
+ I915_MAX_PORTS,
+};
+
+#define GET_MEI_DDI_INDEX(p) ({ \
+ enum i915_port __p = (enum i915_port)(p); \
+ __p == PORT_A ? MEI_DDI_A : (enum mei_hdcp_ddi)__p; \
+})
#endif /* __MEI_HDCP_H__ */
--
2.7.4