Re: [PATCH v3 17/40] misc/mei/hdcp: Enabling the HDCP authentication

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>-----Original Message-----
>From: dri-devel [mailto:dri-devel-bounces@xxxxxxxxxxxxxxxxxxxxx] On Behalf Of
>Ramalingam C
>Sent: Tuesday, April 3, 2018 7:28 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 17/40] misc/mei/hdcp: Enabling the HDCP authentication
>
>Request to ME to configure a port as authenticated.
>
>On Success, ME FW will mark th eport as authenticated and provides HDCP chipper

Rectify "the". Also it should be HDCP cipher.

>of the port with the encryption keys.
>
>Enabling the Authentication can be requested once the all stages of HDCP2.2
>authentication is completed by interating with ME FW.

Typo in interacting.

>
>Only after this stage, driver can enable the HDCP encryption for the port, through
>HW registers.
>
>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 | 54
>++++++++++++++++++++++++++++++++++++++++
> include/linux/mei_hdcp.h         |  7 ++++++
> 2 files changed, 61 insertions(+)
>
>diff --git a/drivers/misc/mei/hdcp/mei_hdcp.c
>b/drivers/misc/mei/hdcp/mei_hdcp.c
>index 68eb5267a8e7..b5d1da41f1d9 100644
>--- a/drivers/misc/mei/hdcp/mei_hdcp.c
>+++ b/drivers/misc/mei/hdcp/mei_hdcp.c
>@@ -632,6 +632,60 @@ int mei_verify_mprime(struct mei_cl_device *cldev,
>struct mei_hdcp_data *data,  }  EXPORT_SYMBOL(mei_verify_mprime);
>
>+/**
>+ * mei_enable_hdcp_authentication:
>+ *	Function to request ME FW to mark a port as authenticated.
>+ *
>+ * @cldev		: Pointer for mei client device
>+ * @data		: Intel HW specific Data
>+ *
>+ * Returns 0 on Success, <0 on Failure
>+ */
>+int mei_enable_hdcp_authentication(struct mei_cl_device *cldev,
>+				   struct mei_hdcp_data *data)
>+{
>+	struct wired_cmd_enable_auth_in enable_auth_in = { { 0 } };
>+	struct wired_cmd_enable_auth_out enable_auth_out = { { 0 } };
>+	struct device *dev;
>+	ssize_t byte;
>+
>+	if (!data)
>+		return -EINVAL;
>+
>+	dev = &cldev->dev;
>+
>+	enable_auth_in.header.api_version = HDCP_API_VERSION;
>+	enable_auth_in.header.command_id = WIRED_ENABLE_AUTH;
>+	enable_auth_in.header.status = ME_HDCP_STATUS_SUCCESS;
>+	enable_auth_in.header.buffer_len =
>WIRED_CMD_BUF_LEN_ENABLE_AUTH_IN;
>+
>+	enable_auth_in.port.integrated_port_type = data->port_type;
>+	enable_auth_in.port.physical_port = data->port;
>+	enable_auth_in.stream_type = data->streams[0].stream_type;

Check for data->streams.

>+
>+	byte = mei_cldev_send(cldev, (u8 *)&enable_auth_in,
>+			      sizeof(enable_auth_in));
>+	if (byte < 0) {
>+		dev_dbg(dev, "mei_cldev_send failed. %d\n", (int)byte);
>+		return byte;
>+	}
>+
>+	byte = mei_cldev_recv(cldev, (u8 *)&enable_auth_out,
>+			      sizeof(enable_auth_out));
>+	if (byte < 0) {
>+		dev_dbg(dev, "mei_cldev_recv failed. %d\n", (int)byte);
>+		return byte;
>+	}
>+
>+	if (enable_auth_out.header.status != ME_HDCP_STATUS_SUCCESS) {
>+		dev_dbg(dev, "ME cmd 0x%08X failed. status: 0x%X\n",
>+			WIRED_ENABLE_AUTH,
>enable_auth_out.header.status);
>+		return -1;
>+	}

Leave a blank line here.

>+	return 0;
>+}
>+EXPORT_SYMBOL(mei_enable_hdcp_authentication);
>+
> 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
>dbc216e13f97..2366d0741abe 100644
>--- a/include/linux/mei_hdcp.h
>+++ b/include/linux/mei_hdcp.h
>@@ -136,6 +136,8 @@ mei_repeater_check_flow_prepare_ack(struct
>mei_cl_device *cldev,
> 				    struct hdcp2_rep_send_ack *rep_send_ack);
>int mei_verify_mprime(struct mei_cl_device *cldev, struct mei_hdcp_data *data,
> 		      struct hdcp2_rep_stream_ready *stream_ready);
>+int mei_enable_hdcp_authentication(struct mei_cl_device *cldev,
>+				   struct mei_hdcp_data *data);
> #else
> static int mei_cldev_register_notify(struct notifier_block *nb)  { @@ -209,5
>+211,10 @@ int mei_verify_mprime(struct mei_cl_device *cldev, struct
>mei_hdcp_data *data,  {
> 	return -ENODEV;
> }
>+static inline int mei_enable_hdcp_authentication(struct mei_cl_device *cldev,
>+						 struct mei_hdcp_data *data)
>+{
>+	return -ENODEV;
>+}
> #endif /* defined (CONFIG_INTEL_MEI_HDCP) */  #endif /* defined
>(_LINUX_MEI_HDCP_H) */
>--
>2.7.4
>
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