[PATCH v6 34/35] misc/mei/hdcp: Enabling the HDCP authentication

[Shankar, Uma]

>-----Original Message-----
>From: C, Ramalingam
>Sent: Saturday, July 14, 2018 8:45 AM
>To: intel-gfx at lists.freedesktop.org; dri-devel at lists.freedesktop.org;
>daniel at ffwll.ch; seanpaul at chromium.org; Winkler, Tomas
><tomas.winkler at intel.com>; Usyskin, Alexander <alexander.usyskin at intel.com>;
>Shankar, Uma <uma.shankar at intel.com>
>Cc: Sharma, Shashank <shashank.sharma at intel.com>; C, Ramalingam
><ramalingam.c at intel.com>
>Subject: [PATCH v6 34/35] misc/mei/hdcp: Enabling the HDCP authentication
>
>Request to ME to configure a port as authenticated.
>
>On Success, ME FW will mark the port as authenticated and provides HDCP cipher
>with the encryption keys.
>
>Enabling the Authentication can be requested once all stages of
>HDCP2.2 authentication is completed by interacting with ME FW.
>
>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]
>v4:
>  %zd for ssize_t [Alexander]
>  %s/return -1/return -EIO [Alexander]
>  Style and typos fixed [Uma]
>v5:
>  Rebased.
>v6:
>  No change.
>

Looks ok to me.
Reviewed-by: Uma Shankar <uma.shankar at intel.com>

>Signed-off-by: Ramalingam C <ramalingam.c at intel.com>
>---
> drivers/misc/mei/hdcp/mei_hdcp.c | 57
>+++++++++++++++++++++++++++++++++++++++-
> 1 file changed, 56 insertions(+), 1 deletion(-)
>
>diff --git a/drivers/misc/mei/hdcp/mei_hdcp.c
>b/drivers/misc/mei/hdcp/mei_hdcp.c
>index 7841fe94a96f..fdfdfb1724ec 100644
>--- a/drivers/misc/mei/hdcp/mei_hdcp.c
>+++ b/drivers/misc/mei/hdcp/mei_hdcp.c
>@@ -624,6 +624,60 @@ static int mei_verify_mprime(struct mei_cl_device
>*cldev,
> 	return 0;
> }
>
>+/*
>+ * 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
>+ */
>+static 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;
>+
>+	byte = mei_cldev_send(cldev, (u8 *)&enable_auth_in,
>+			      sizeof(enable_auth_in));
>+	if (byte < 0) {
>+		dev_dbg(dev, "mei_cldev_send failed. %zd\n", 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. %zd\n", 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 -EIO;
>+	}
>+
>+	return 0;
>+}
>+
> struct i915_hdcp_component_ops mei_hdcp_component_ops = {
> 	.owner					= THIS_MODULE,
> 	.initiate_hdcp2_session			= mei_initiate_hdcp2_session,
>@@ -637,7 +691,8 @@ struct i915_hdcp_component_ops
>mei_hdcp_component_ops = {
> 	.repeater_check_flow_prepare_ack	=
>
>	mei_repeater_check_flow_prepare_ack,
> 	.verify_mprime				= mei_verify_mprime,
>-	.enable_hdcp_authentication		= NULL,
>+	.enable_hdcp_authentication		=
>+					mei_enable_hdcp_authentication,
> 	.close_hdcp_session			= NULL,
> };
>
>--
>2.7.4