>
> Requests for the verification of AKE_Send_H_prime.
>
> ME will calculate the H and comparing it with received H_Prime.
> The result will be returned as status.
>
> Here AKE_Send_H_prime is a HDCP2.2 Authentication msg.
>
> 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]
> Styles and typos fixed [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]
> memcpy for const length.
> 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 | 58
> +++++++++++++++++++++++++++++++++++++++-
> 1 file changed, 57 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/misc/mei/hdcp/mei_hdcp.c
> b/drivers/misc/mei/hdcp/mei_hdcp.c
> index 922c6a76bb9f..0a4087a2efd5 100644
> --- a/drivers/misc/mei/hdcp/mei_hdcp.c
> +++ b/drivers/misc/mei/hdcp/mei_hdcp.c
> @@ -182,13 +182,69 @@ mei_hdcp_verify_receiver_cert_prepare_km(struct
> device *dev,
> return 0;
> }
>
> +/**
> + * mei_hdcp_verify_hprime() - Verify AKE_Send_H_prime at ME FW.
> + * @dev: device corresponding to the mei_cl_device
> + * @data: Intel HW specific hdcp data
> + * @rx_hprime: AKE_Send_H_prime msg for ME FW verification
> + *
> + * Return: 0 on Success, <0 on Failure
> + */
> +static int
> +mei_hdcp_verify_hprime(struct device *dev, struct hdcp_port_data *data,
> + struct hdcp2_ake_send_hprime *rx_hprime) {
> + struct wired_cmd_ake_send_hprime_in send_hprime_in = { { 0 } };
> + struct wired_cmd_ake_send_hprime_out send_hprime_out = { { 0 } };
> + struct mei_cl_device *cldev;
> + ssize_t byte;
> +
> + if (!dev || !data || !rx_hprime)
> + return -EINVAL;
> +
> + cldev = to_mei_cl_device(dev);
> +
> + send_hprime_in.header.api_version = HDCP_API_VERSION;
> + send_hprime_in.header.command_id = WIRED_AKE_SEND_HPRIME;
> + send_hprime_in.header.status = ME_HDCP_STATUS_SUCCESS;
> + send_hprime_in.header.buffer_len =
> +WIRED_CMD_BUF_LEN_AKE_SEND_HPRIME_IN;
> +
> + send_hprime_in.port.integrated_port_type = data->port_type;
> + send_hprime_in.port.physical_port = mei_get_ddi_index(data->port);
> +
> + memcpy(send_hprime_in.h_prime, rx_hprime->h_prime,
> + HDCP_2_2_H_PRIME_LEN);
> +
> + byte = mei_cldev_send(cldev, (u8 *)&send_hprime_in,
> + sizeof(send_hprime_in));
> + if (byte < 0) {
> + dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
> + return byte;
> + }
> +
> + byte = mei_cldev_recv(cldev, (u8 *)&send_hprime_out,
> + sizeof(send_hprime_out));
> + if (byte < 0) {
> + dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
> + return byte;
> + }
> +
> + if (send_hprime_out.header.status != ME_HDCP_STATUS_SUCCESS) {
> + dev_dbg(dev, "ME cmd 0x%08X Failed. Status: 0x%X\n",
> + WIRED_AKE_SEND_HPRIME,
> send_hprime_out.header.status);
> + return -EIO;
> + }
> +
> + return 0;
> +}
> +
> static __attribute__((unused))
> struct i915_hdcp_component_ops mei_hdcp_ops = {
> .owner = THIS_MODULE,
> .initiate_hdcp2_session = mei_hdcp_initiate_session,
> .verify_receiver_cert_prepare_km =
> mei_hdcp_verify_receiver_cert_prepare_km,
> - .verify_hprime = NULL,
> + .verify_hprime = mei_hdcp_verify_hprime,
> .store_pairing_info = NULL,
> .initiate_locality_check = NULL,
> .verify_lprime = NULL,
> --
> 2.7.4
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