RE: [PATCH v6 28/35] misc/mei/hdcp: Store the HDCP Pairing info

-----Original Message----- From: C, Ramalingam Sent: Saturday, July 14, 2018 8:45 AM To: intel-gfx@lists.freedesktop.org; dri-devel@lists.freedesktop.org; daniel@ffwll.ch; seanpaul@chromium.org; Winkler, Tomas tomas.winkler@intel.com; Usyskin, Alexander alexander.usyskin@intel.com; Shankar, Uma uma.shankar@intel.com Cc: Sharma, Shashank shashank.sharma@intel.com; C, Ramalingam ramalingam.c@intel.com Subject: [PATCH v6 28/35] 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: No change.

Looks ok to me. Reviewed-by: Uma Shankar uma.shankar@intel.com

Signed-off-by: Ramalingam C ramalingam.c@intel.com

drivers/misc/mei/hdcp/mei_hdcp.c | 63 +++++++++++++++++++++++++++++++++++++++- 1 file changed, 62 insertions(+), 1 deletion(-)

diff --git a/drivers/misc/mei/hdcp/mei_hdcp.c b/drivers/misc/mei/hdcp/mei_hdcp.c index d455d4e54f46..4349eff4d0fb 100644 --- a/drivers/misc/mei/hdcp/mei_hdcp.c +++ b/drivers/misc/mei/hdcp/mei_hdcp.c @@ -246,13 +246,74 @@ static int mei_verify_hprime(struct mei_cl_device *cldev, return 0; }

+/*

• • mei_store_pairing_info:
• • Function to store pairing info received from panel
• • cldev : Pointer for mei client device
• • data : Intel HW specific Data
• • pairing_info : Pointer for AKE_Send_Pairing_Info
• • Returns 0 on Success, <0 on Failure
• */

+static int +mei_store_pairing_info(struct mei_cl_device *cldev,

•        struct mei_hdcp_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 device *dev;
• ssize_t byte;
• if (!data || !pairing_info)

• return -EINVAL;
  

• dev = &cldev->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 = data->port;
• memcpy(pairing_info_in.e_kh_km, pairing_info->e_kh_km,

•       sizeof(pairing_info_in.e_kh_km));
  

• 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;

+}

struct i915_hdcp_component_ops mei_hdcp_component_ops = { .owner = THIS_MODULE, .initiate_hdcp2_session = mei_initiate_hdcp2_session, .verify_receiver_cert_prepare_km = mei_verify_receiver_cert_prepare_km, .verify_hprime = mei_verify_hprime,

• .store_pairing_info = NULL,

• .store_pairing_info = mei_store_pairing_info, .initiate_locality_check = NULL, .verify_lprime = NULL, .get_session_key = NULL,

-- 2.7.4