Re: [PATCH v3 12/40] misc/mei/hdcp: Initiate Locality check

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On Wednesday 09 May 2018 04:01 PM, Shankar, Uma wrote:

-----Original Message-----
From: dri-devel [mailto:dri-devel-bounces@xxxxxxxxxxxxxxxxxxxxx] On Behalf Of
Ramalingam C
Sent: Tuesday, April 3, 2018 7:27 PM
To: intel-gfx@xxxxxxxxxxxxxxxxxxxxx; dri-devel@xxxxxxxxxxxxxxxxxxxxx;
seanpaul@xxxxxxxxxxxx; daniel@xxxxxxxx; chris@xxxxxxxxxxxxxxxxxx;
jani.nikula@xxxxxxxxxxxxxxx; Winkler, Tomas <tomas.winkler@xxxxxxxxx>;
Usyskin, Alexander <alexander.usyskin@xxxxxxxxx>
Cc: Vivi, Rodrigo <rodrigo.vivi@xxxxxxxxx>
Subject: [PATCH v3 12/40] misc/mei/hdcp: Initiate Locality check

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]

Signed-off-by: Ramalingam C <ramalingam.c@xxxxxxxxx>
---
drivers/misc/mei/hdcp/mei_hdcp.c | 56
++++++++++++++++++++++++++++++++++++++++
include/linux/mei_hdcp.h         | 10 +++++++
2 files changed, 66 insertions(+)

diff --git a/drivers/misc/mei/hdcp/mei_hdcp.c
b/drivers/misc/mei/hdcp/mei_hdcp.c
index 60afdd0cee79..9bd7e66a91e4 100644
--- a/drivers/misc/mei/hdcp/mei_hdcp.c
+++ b/drivers/misc/mei/hdcp/mei_hdcp.c
@@ -305,6 +305,62 @@ int mei_store_pairing_info(struct mei_cl_device *cldev,
}  EXPORT_SYMBOL(mei_store_pairing_info);

+/**
+ * mei_initiate_locality_check:
+ *	Function to prepare LC_Init.
+ *
+ * @cldev		: Pointer for mei client device
+ * @data		: Intel HW specific Data
+ * @hdcp2_lc_init	: Pointer for storing LC_Init
+ *
+ * Returns 0 on Success, <0 on Failure
+ */
+int mei_initiate_locality_check(struct mei_cl_device *cldev,
+				struct mei_hdcp_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 device *dev;
+	ssize_t byte;
+
+	if (!data || !lc_init_data)
+		return -EINVAL;
+
+	dev = &cldev->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 = 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. %d\n", (int)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. %d\n", (int)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 -1;
+	}
+
+	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);
Check for validity of lc_init_data->r_n.
Also, leave a blank line.
ok

--Ram

+	return 0;
+}
+EXPORT_SYMBOL(mei_initiate_locality_check);
+
void mei_cldev_state_notify_clients(struct mei_cl_device *cldev, bool enabled)  {
	if (enabled)
diff --git a/include/linux/mei_hdcp.h b/include/linux/mei_hdcp.h index
be16e49d8018..d9c4cac0b276 100644
--- a/include/linux/mei_hdcp.h
+++ b/include/linux/mei_hdcp.h
@@ -121,6 +121,9 @@ int mei_verify_hprime(struct mei_cl_device *cldev, struct
mei_hdcp_data *data,  int mei_store_pairing_info(struct mei_cl_device *cldev,
			   struct mei_hdcp_data *data,
			   struct hdcp2_ake_send_pairing_info *pairing_info);
+int mei_initiate_locality_check(struct mei_cl_device *cldev,
+				struct mei_hdcp_data *data,
+				struct hdcp2_lc_init *lc_init_data);
#else
static int mei_cldev_register_notify(struct notifier_block *nb)  { @@ -160,5
+163,12 @@ int mei_store_pairing_info(struct mei_cl_device *cldev,  {
	return -ENODEV;
}
+static inline
+int mei_initiate_locality_check(struct mei_cl_device *cldev,
+				struct mei_hdcp_data *data,
+				struct hdcp2_lc_init *lc_init_data) {
+	return -ENODEV;
+}
#endif /* defined (CONFIG_INTEL_MEI_HDCP) */  #endif /* defined
(_LINUX_MEI_HDCP_H) */
--
2.7.4

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