>
> 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.
> v9:
> renamed func as mei_hdcp_* [Tomas]
> Inline function is defined for DDI index [Tomas]
>
> Signed-off-by: Ramalingam C <ramalingam.c@xxxxxxxxx>
> Reviewed-by: Uma Shankar <uma.shankar@xxxxxxxxx>
> Acked-by: Tomas Winkler <tomas.winkler@xxxxxxxxx>
> ---
> drivers/misc/mei/hdcp/mei_hdcp.c | 67
> +++++++++++++++++++++++++++++++++++++++-
> 1 file changed, 66 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/misc/mei/hdcp/mei_hdcp.c
> b/drivers/misc/mei/hdcp/mei_hdcp.c
> index 6cd76b3bcaea..7d0562c2a773 100644
> --- a/drivers/misc/mei/hdcp/mei_hdcp.c
> +++ b/drivers/misc/mei/hdcp/mei_hdcp.c
> @@ -535,6 +535,71 @@ mei_hdcp_repeater_check_flow_prepare_ack(struct
> device *dev,
> return 0;
> }
>
> +/**
> + * mei_hdcp_verify_mprime() - Verify mprime.
> + * @dev: device corresponding to the mei_cl_device
> + * @hdcp_data: Intel HW specific hdcp data
This should be @data across all the functions.
> + * @stream_ready: RepeaterAuth_Stream_Ready msg for ME FW verification.
> + *
> + * Return: 0 on Success, <0 on Failure
> + */
> +static int mei_hdcp_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 = mei_get_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,
> @@ -548,7 +613,7 @@ struct i915_hdcp_component_ops mei_hdcp_ops = {
> .get_session_key = mei_hdcp_get_session_key,
> .repeater_check_flow_prepare_ack =
> mei_hdcp_repeater_check_flow_prepare_ack,
> - .verify_mprime = NULL,
> + .verify_mprime = mei_hdcp_verify_mprime,
> .enable_hdcp_authentication = NULL,
> .close_hdcp_session = NULL,
> };
> --
> 2.7.4
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