Request to ME to verify the M_Prime received from the HDCP sink.

ME FW will calculate the M and compare with M_prime received
as part of RepeaterAuth_Stream_Ready, which is HDCP2.2 protocol msg.

On successful completion of this stage, downstream propagation of
the stream management info is completed.

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]
  endianness conversion func is moved to drm_hdcp.h [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]
  drm_hdcp2_u32_to_seq_num() is used for u32 to seq_num.

Signed-off-by: Ramalingam C <ramalinga...@intel.com>
Reviewed-by: Uma Shankar <uma.shan...@intel.com>
---
 drivers/misc/mei/hdcp/mei_hdcp.c | 66 +++++++++++++++++++++++++++++++++++++++-
 1 file changed, 65 insertions(+), 1 deletion(-)

diff --git a/drivers/misc/mei/hdcp/mei_hdcp.c b/drivers/misc/mei/hdcp/mei_hdcp.c
index b8c039107d0f..9f24a66e3260 100644
--- a/drivers/misc/mei/hdcp/mei_hdcp.c
+++ b/drivers/misc/mei/hdcp/mei_hdcp.c
@@ -522,6 +522,70 @@ mei_repeater_check_flow_prepare_ack(struct device *dev,
        return 0;
 }
 
+/**
+ * mei_verify_mprime() - Verify mprime.
+ * @dev: device corresponding to the mei_cl_device
+ * @hdcp_data: Intel HW specific hdcp data
+ * @stream_ready: RepeaterAuth_Stream_Ready msg for ME FW verification.
+ *
+ * Return: 0 on Success, <0 on Failure
+ */
+static int mei_verify_mprime(struct device *dev, struct hdcp_port_data *data,
+                            struct hdcp2_rep_stream_ready *stream_ready)
+{
+       struct wired_cmd_repeater_auth_stream_req_in
+                                       verify_mprime_in = { { 0 } };
+       struct wired_cmd_repeater_auth_stream_req_out
+                                       verify_mprime_out = { { 0 } };
+       struct mei_cl_device *cldev;
+       ssize_t byte;
+
+       if (!dev || !stream_ready || !data)
+               return -EINVAL;
+
+       cldev = to_mei_cl_device(dev);
+
+       verify_mprime_in.header.api_version = HDCP_API_VERSION;
+       verify_mprime_in.header.command_id = WIRED_REPEATER_AUTH_STREAM_REQ;
+       verify_mprime_in.header.status = ME_HDCP_STATUS_SUCCESS;
+       verify_mprime_in.header.buffer_len =
+                       WIRED_CMD_BUF_LEN_REPEATER_AUTH_STREAM_REQ_MIN_IN;
+
+       verify_mprime_in.port.integrated_port_type = data->port_type;
+       verify_mprime_in.port.physical_port = (u8)GET_MEI_DDI_INDEX(data->port);
+
+       memcpy(verify_mprime_in.m_prime, stream_ready->m_prime,
+              HDCP_2_2_MPRIME_LEN);
+       drm_hdcp2_u32_to_seq_num(verify_mprime_in.seq_num_m, data->seq_num_m);
+       memcpy(verify_mprime_in.streams, data->streams,
+              (data->k * sizeof(struct hdcp2_streamid_type)));
+
+       verify_mprime_in.k = __swab16(data->k);
+
+       byte = mei_cldev_send(cldev, (u8 *)&verify_mprime_in,
+                             sizeof(verify_mprime_in));
+       if (byte < 0) {
+               dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
+               return byte;
+       }
+
+       byte = mei_cldev_recv(cldev, (u8 *)&verify_mprime_out,
+                             sizeof(verify_mprime_out));
+       if (byte < 0) {
+               dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
+               return byte;
+       }
+
+       if (verify_mprime_out.header.status != ME_HDCP_STATUS_SUCCESS) {
+               dev_dbg(dev, "ME cmd 0x%08X failed. status: 0x%X\n",
+                       WIRED_REPEATER_AUTH_STREAM_REQ,
+                       verify_mprime_out.header.status);
+               return -EIO;
+       }
+
+       return 0;
+}
+
 static __attribute__((unused))
 struct i915_hdcp_component_ops mei_hdcp_ops = {
        .owner = THIS_MODULE,
@@ -533,7 +597,7 @@ struct i915_hdcp_component_ops mei_hdcp_ops = {
        .verify_lprime = mei_verify_lprime,
        .get_session_key = mei_get_session_key,
        .repeater_check_flow_prepare_ack = mei_repeater_check_flow_prepare_ack,
-       .verify_mprime = NULL,
+       .verify_mprime = mei_verify_mprime,
        .enable_hdcp_authentication = NULL,
        .close_hdcp_session = NULL,
 };
-- 
2.7.4

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