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misc/mei/hdcp: Initiate Locality check

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Requests ME to start the second stage of HDCP2.2 authentication,
called Locality Check.

On Success, ME FW will provide LC_Init message to send to hdcp sink.

v2: Rebased.
v3:
  cldev is passed as first parameter [Tomas]
  Redundant comments and cast are removed [Tomas]
v4:
  %zd used 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]
v9:
  renamed func as mei_hdcp_* [Tomas]
  Inline function is defined for DDI index [Tomas]
v10:
  K-Doc fix. [Tomas]
v11:
  Rebased.

Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Acked-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/1550772730-23280-9-git-send-email-ramalingam.c@intel.com
This commit is contained in:
Ramalingam C 2019-02-21 23:42:02 +05:30 committed by Daniel Vetter
parent 6a1a00a30e
commit 682932f3e1
1 changed files with 56 additions and 1 deletions
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57
drivers/misc/mei/hdcp/mei_hdcp.c
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@ -296,6 +296,61 @@ mei_hdcp_store_pairing_info(struct device *dev, struct hdcp_port_data *data,
return 0;
}
/**
* mei_hdcp_initiate_locality_check() - Prepare LC_Init
* @dev: device corresponding to the mei_cl_device
* @data: Intel HW specific hdcp data
* @lc_init_data: LC_Init msg output
*
* Return: 0 on Success, <0 on Failure
*/
static int
mei_hdcp_initiate_locality_check(struct device *dev,
struct hdcp_port_data *data,
struct hdcp2_lc_init *lc_init_data)
{
struct wired_cmd_init_locality_check_in lc_init_in = { { 0 } };
struct wired_cmd_init_locality_check_out lc_init_out = { { 0 } };
struct mei_cl_device *cldev;
ssize_t byte;
if (!dev || !data || !lc_init_data)
return -EINVAL;
cldev = to_mei_cl_device(dev);
lc_init_in.header.api_version = HDCP_API_VERSION;
lc_init_in.header.command_id = WIRED_INIT_LOCALITY_CHECK;
lc_init_in.header.status = ME_HDCP_STATUS_SUCCESS;
lc_init_in.header.buffer_len = WIRED_CMD_BUF_LEN_INIT_LOCALITY_CHECK_IN;
lc_init_in.port.integrated_port_type = data->port_type;
lc_init_in.port.physical_port = mei_get_ddi_index(data->port);
byte = mei_cldev_send(cldev, (u8 *)&lc_init_in, sizeof(lc_init_in));
if (byte < 0) {
dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
return byte;
}
byte = mei_cldev_recv(cldev, (u8 *)&lc_init_out, sizeof(lc_init_out));
if (byte < 0) {
dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
return byte;
}
if (lc_init_out.header.status != ME_HDCP_STATUS_SUCCESS) {
dev_dbg(dev, "ME cmd 0x%08X Failed. status: 0x%X\n",
WIRED_INIT_LOCALITY_CHECK, lc_init_out.header.status);
return -EIO;
}
lc_init_data->msg_id = HDCP_2_2_LC_INIT;
memcpy(lc_init_data->r_n, lc_init_out.r_n, HDCP_2_2_RN_LEN);
return 0;
}
static const __attribute__((unused))
struct i915_hdcp_component_ops mei_hdcp_ops = {
.owner = THIS_MODULE,
@ -304,7 +359,7 @@ struct i915_hdcp_component_ops mei_hdcp_ops = {
mei_hdcp_verify_receiver_cert_prepare_km,
.verify_hprime = mei_hdcp_verify_hprime,
.store_pairing_info = mei_hdcp_store_pairing_info,
.initiate_locality_check = NULL,
.initiate_locality_check = mei_hdcp_initiate_locality_check,
.verify_lprime = NULL,
.get_session_key = NULL,
.repeater_check_flow_prepare_ack = NULL,