> Request to ME to verify the LPrime received from HDCP sink.
>
> On Success, ME FW will verify the received Lprime by calculating and
> comparing with L.
>
> This represents the completion of Locality Check.
>
> 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 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 | 60
> +++++++++++++++++++++++++++++++++++++++-
> 1 file changed, 59 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/misc/mei/hdcp/mei_hdcp.c
> b/drivers/misc/mei/hdcp/mei_hdcp.c
> index 29ef61fd21d2..869a6f22f68d 100644
> --- a/drivers/misc/mei/hdcp/mei_hdcp.c
> +++ b/drivers/misc/mei/hdcp/mei_hdcp.c
> @@ -351,6 +351,64 @@ mei_hdcp_initiate_locality_check(struct device *dev,
> return 0;
> }
>
> +/**
> + * mei_hdcp_verify_lprime() - Verify lprime.
> + * @dev: device corresponding to the mei_cl_device
> + * @data: Intel HW specific hdcp data
> + * @rx_lprime: LC_Send_L_prime msg for ME FW verification
> + *
> + * Return: 0 on Success, <0 on Failure
> + */
> +static int
> +mei_hdcp_verify_lprime(struct device *dev, struct hdcp_port_data *data,
> + struct hdcp2_lc_send_lprime *rx_lprime) {
> + struct wired_cmd_validate_locality_in verify_lprime_in = { { 0 } };
> + struct wired_cmd_validate_locality_out verify_lprime_out = { { 0 } };
> + struct mei_cl_device *cldev;
> + ssize_t byte;
> +
> + if (!dev || !data || !rx_lprime)
> + return -EINVAL;
> +
> + cldev = to_mei_cl_device(dev);
> +
> + verify_lprime_in.header.api_version = HDCP_API_VERSION;
> + verify_lprime_in.header.command_id = WIRED_VALIDATE_LOCALITY;
> + verify_lprime_in.header.status = ME_HDCP_STATUS_SUCCESS;
> + verify_lprime_in.header.buffer_len =
> +
> WIRED_CMD_BUF_LEN_VALIDATE_LOCALITY_IN;
> +
> + verify_lprime_in.port.integrated_port_type = data->port_type;
> + verify_lprime_in.port.physical_port = mei_get_ddi_index(data->port);
> +
> + memcpy(verify_lprime_in.l_prime, rx_lprime->l_prime,
> + HDCP_2_2_L_PRIME_LEN);
> +
> + byte = mei_cldev_send(cldev, (u8 *)&verify_lprime_in,
> + sizeof(verify_lprime_in));
> + if (byte < 0) {
> + dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
> + return byte;
> + }
> +
> + byte = mei_cldev_recv(cldev, (u8 *)&verify_lprime_out,
> + sizeof(verify_lprime_out));
> + if (byte < 0) {
> + dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
> + return byte;
> + }
> +
> + if (verify_lprime_out.header.status != ME_HDCP_STATUS_SUCCESS) {
> + dev_dbg(dev, "ME cmd 0x%08X failed. status: 0x%X\n",
> + WIRED_VALIDATE_LOCALITY,
> + verify_lprime_out.header.status);
> + return -EIO;
> + }
> +
> + return 0;
> +}
> +
> static __attribute__((unused))
> struct i915_hdcp_component_ops mei_hdcp_ops = {
> .owner = THIS_MODULE,
> @@ -360,7 +418,7 @@ struct i915_hdcp_component_ops mei_hdcp_ops = {
> .verify_hprime = mei_hdcp_verify_hprime,
> .store_pairing_info = mei_hdcp_store_pairing_info,
> .initiate_locality_check = mei_hdcp_initiate_locality_check,
> - .verify_lprime = NULL,
> + .verify_lprime = mei_hdcp_verify_lprime,
> .get_session_key = NULL,
> .repeater_check_flow_prepare_ack = NULL,
> .verify_mprime = NULL,
> --
> 2.7.4
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