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misc/mei/hdcp: Store the HDCP Pairing info 

Provides Pairing info to ME to store.

Pairing is a process to fast track the subsequent authentication
with the same HDCP sink.

On Success, received HDCP pairing info is stored in non-volatile
memory of ME.

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]
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/1550772730-23280-8-git-send-email-ramalingam.c@intel.com
This commit is contained in:
Ramalingam C 2019-02-21 23:42:01 +05:30 committed by Daniel Vetter
parent a7dcbed2bb
commit 6a1a00a30e
1 changed files with 59 additions and 1 deletions
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60
drivers/misc/mei/hdcp/mei_hdcp.c
View File

@ -238,6 +238,64 @@ mei_hdcp_verify_hprime(struct device *dev, struct hdcp_port_data *data,
return 0;
}
/**
* mei_hdcp_store_pairing_info() - Store pairing info received at ME FW
* @dev: device corresponding to the mei_cl_device
* @data: Intel HW specific hdcp data
* @pairing_info: AKE_Send_Pairing_Info msg input to ME FW
*
* Return: 0 on Success, <0 on Failure
*/
static int
mei_hdcp_store_pairing_info(struct device *dev, struct hdcp_port_data *data,
struct hdcp2_ake_send_pairing_info *pairing_info)
{
struct wired_cmd_ake_send_pairing_info_in pairing_info_in = { { 0 } };
struct wired_cmd_ake_send_pairing_info_out pairing_info_out = { { 0 } };
struct mei_cl_device *cldev;
ssize_t byte;
if (!dev || !data || !pairing_info)
return -EINVAL;
cldev = to_mei_cl_device(dev);
pairing_info_in.header.api_version = HDCP_API_VERSION;
pairing_info_in.header.command_id = WIRED_AKE_SEND_PAIRING_INFO;
pairing_info_in.header.status = ME_HDCP_STATUS_SUCCESS;
pairing_info_in.header.buffer_len =
WIRED_CMD_BUF_LEN_SEND_PAIRING_INFO_IN;
pairing_info_in.port.integrated_port_type = data->port_type;
pairing_info_in.port.physical_port = mei_get_ddi_index(data->port);
memcpy(pairing_info_in.e_kh_km, pairing_info->e_kh_km,
HDCP_2_2_E_KH_KM_LEN);
byte = mei_cldev_send(cldev, (u8 *)&pairing_info_in,
sizeof(pairing_info_in));
if (byte < 0) {
dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
return byte;
}
byte = mei_cldev_recv(cldev, (u8 *)&pairing_info_out,
sizeof(pairing_info_out));
if (byte < 0) {
dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
return byte;
}
if (pairing_info_out.header.status != ME_HDCP_STATUS_SUCCESS) {
dev_dbg(dev, "ME cmd 0x%08X failed. Status: 0x%X\n",
WIRED_AKE_SEND_PAIRING_INFO,
pairing_info_out.header.status);
return -EIO;
}
return 0;
}
static const __attribute__((unused))
struct i915_hdcp_component_ops mei_hdcp_ops = {
.owner = THIS_MODULE,
@ -245,7 +303,7 @@ struct i915_hdcp_component_ops mei_hdcp_ops = {
.verify_receiver_cert_prepare_km =
mei_hdcp_verify_receiver_cert_prepare_km,
.verify_hprime = mei_hdcp_verify_hprime,
.store_pairing_info = NULL,
.store_pairing_info = mei_hdcp_store_pairing_info,
.initiate_locality_check = NULL,
.verify_lprime = NULL,
.get_session_key = NULL,