> ack
>
> Request ME to verify the downstream topology information received.
>
> ME FW will validate the Repeaters receiver id list and downstream topology.
>
> On Success ME FW will provide the Least Significant 128bits of VPrime, which
> forms the repeater ack.
>
> 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]
> Style and typos fixed [Uma]
> v5: Rebased.
> v6: Rebasing.
> v7:
> Adjust to the new mei interface.
> Fix for Kdoc.
> v8:
> K-Doc addition. [Tomas]
> v9:
> renamed func as mei_hdcp_* [Tomas]
> Inline function is defined for DDI index [Tomas]
> v10:
> K-Doc fix. [Tomas]
>
> Signed-off-by: Ramalingam C <ramalingam.c@xxxxxxxxx>
> Reviewed-by: Uma Shankar <uma.shankar@xxxxxxxxx>
> Acked-by: Tomas Winkler <tomas.winkler@xxxxxxxxx>
LGTM
> ---
> drivers/misc/mei/hdcp/mei_hdcp.c | 77
> +++++++++++++++++++++++++++++++++++++++-
> 1 file changed, 76 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/misc/mei/hdcp/mei_hdcp.c
> b/drivers/misc/mei/hdcp/mei_hdcp.c
> index fe5070f901e8..c06a9805ac85 100644
> --- a/drivers/misc/mei/hdcp/mei_hdcp.c
> +++ b/drivers/misc/mei/hdcp/mei_hdcp.c
> @@ -466,6 +466,80 @@ static int mei_hdcp_get_session_key(struct device
> *dev,
> return 0;
> }
>
> +/**
> + * mei_hdcp_repeater_check_flow_prepare_ack() - Validate the Downstream
> +topology
> + * and prepare rep_ack.
> + * @dev: device corresponding to the mei_cl_device
> + * @data: Intel HW specific hdcp data
> + * @rep_topology: Receiver ID List to be validated
> + * @rep_send_ack : repeater ack from ME FW.
> + *
> + * Return: 0 on Success, <0 on Failure
> + */
> +static int
> +mei_hdcp_repeater_check_flow_prepare_ack(struct device *dev,
> + struct hdcp_port_data *data,
> + struct hdcp2_rep_send_receiverid_list
> + *rep_topology,
> + struct hdcp2_rep_send_ack
> + *rep_send_ack)
> +{
> + struct wired_cmd_verify_repeater_in verify_repeater_in = { { 0 } };
> + struct wired_cmd_verify_repeater_out verify_repeater_out = { { 0 } };
> + struct mei_cl_device *cldev;
> + ssize_t byte;
> +
> + if (!dev || !rep_topology || !rep_send_ack || !data)
> + return -EINVAL;
> +
> + cldev = to_mei_cl_device(dev);
> +
> + verify_repeater_in.header.api_version = HDCP_API_VERSION;
> + verify_repeater_in.header.command_id = WIRED_VERIFY_REPEATER;
> + verify_repeater_in.header.status = ME_HDCP_STATUS_SUCCESS;
> + verify_repeater_in.header.buffer_len =
> +
> WIRED_CMD_BUF_LEN_VERIFY_REPEATER_IN;
> +
> + verify_repeater_in.port.integrated_port_type = data->port_type;
> + verify_repeater_in.port.physical_port = mei_get_ddi_index(data-
> >port);
> +
> + memcpy(verify_repeater_in.rx_info, rep_topology->rx_info,
> + HDCP_2_2_RXINFO_LEN);
> + memcpy(verify_repeater_in.seq_num_v, rep_topology->seq_num_v,
> + HDCP_2_2_SEQ_NUM_LEN);
> + memcpy(verify_repeater_in.v_prime, rep_topology->v_prime,
> + HDCP_2_2_V_PRIME_HALF_LEN);
> + memcpy(verify_repeater_in.receiver_ids, rep_topology->receiver_ids,
> + HDCP_2_2_RECEIVER_IDS_MAX_LEN);
> +
> + byte = mei_cldev_send(cldev, (u8 *)&verify_repeater_in,
> + sizeof(verify_repeater_in));
> + if (byte < 0) {
> + dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
> + return byte;
> + }
> +
> + byte = mei_cldev_recv(cldev, (u8 *)&verify_repeater_out,
> + sizeof(verify_repeater_out));
> + if (byte < 0) {
> + dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
> + return byte;
> + }
> +
> + if (verify_repeater_out.header.status != ME_HDCP_STATUS_SUCCESS) {
> + dev_dbg(dev, "ME cmd 0x%08X failed. status: 0x%X\n",
> + WIRED_VERIFY_REPEATER,
> + verify_repeater_out.header.status);
> + return -EIO;
> + }
> +
> + memcpy(rep_send_ack->v, verify_repeater_out.v,
> + HDCP_2_2_V_PRIME_HALF_LEN);
> + rep_send_ack->msg_id = HDCP_2_2_REP_SEND_ACK;
> +
> + return 0;
> +}
> +
> static __attribute__((unused))
> struct i915_hdcp_component_ops mei_hdcp_ops = {
> .owner = THIS_MODULE,
> @@ -477,7 +551,8 @@ struct i915_hdcp_component_ops mei_hdcp_ops = {
> .initiate_locality_check = mei_hdcp_initiate_locality_check,
> .verify_lprime = mei_hdcp_verify_lprime,
> .get_session_key = mei_hdcp_get_session_key,
> - .repeater_check_flow_prepare_ack = NULL,
> + .repeater_check_flow_prepare_ack =
> + mei_hdcp_repeater_check_flow_prepare_ack,
> .verify_mprime = NULL,
> .enable_hdcp_authentication = NULL,
> .close_hdcp_session = NULL,
> --
> 2.7.4
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