[PATCH v6 25/35] misc/mei/hdcp: Initiate Wired HDCP2.2 Tx Session

[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 25/35] misc/mei/hdcp: Initiate Wired HDCP2.2 Tx Session
>
>Request ME FW to start the HDCP2.2 session for an intel port.
>Prepares payloads for command WIRED_INITIATE_HDCP2_SESSION and sends to
>ME FW.
>
>On Success, ME FW will start a HDCP2.2 session for the port and provides the
>content for HDCP2.2 AKE_Init message.
>
>v2:
>  Rebased.
>v3:
>  cldev is add as a separate parameter [Tomas]
>  Redundant comment and typecast are removed [Tomas]
>v4:
>  %zd is used for size [Alexander]
>  %s/return -1/return -EIO [Alexander]
>  Spellings in commit msg is 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 | 70
>+++++++++++++++++++++++++++++++++++++++-
> 1 file changed, 69 insertions(+), 1 deletion(-)
>
>diff --git a/drivers/misc/mei/hdcp/mei_hdcp.c
>b/drivers/misc/mei/hdcp/mei_hdcp.c
>index adfb14a2ea4f..44b1aac03ff0 100644
>--- a/drivers/misc/mei/hdcp/mei_hdcp.c
>+++ b/drivers/misc/mei/hdcp/mei_hdcp.c
>@@ -32,14 +32,82 @@
> #include <linux/uuid.h>
> #include <linux/mei_cl_bus.h>
> #include <linux/component.h>
>+#include <linux/mei_hdcp.h>
> #include <drm/i915_component.h>
>+#include <drm/drm_connector.h>
>+
>+#include "mei_hdcp.h"
>
> bool mei_hdcp_component_registered;
> static struct mei_cl_device *mei_cldev;
>
>+/*
>+ * mei_initiate_hdcp2_session:
>+ *	Function to start a Wired HDCP2.2 Tx Session with ME FW
>+ *
>+ * cldev		: Pointer for mei client device
>+ * data			: Intel HW specific Data
>+ * ake_data		: ptr to store AKE_Init
>+ *
>+ * Returns 0 on Success, <0 on Failure.
>+ */
>+static int mei_initiate_hdcp2_session(struct mei_cl_device *cldev,
>+				      struct mei_hdcp_data *data,
>+				      struct hdcp2_ake_init *ake_data) {
>+	struct wired_cmd_initiate_hdcp2_session_in session_init_in = { { 0 } };
>+	struct wired_cmd_initiate_hdcp2_session_out
>+						session_init_out = { { 0 } };
>+	struct device *dev;
>+	ssize_t byte;
>+
>+	if (!data || !ake_data)
>+		return -EINVAL;
>+
>+	dev = &cldev->dev;
>+
>+	session_init_in.header.api_version = HDCP_API_VERSION;
>+	session_init_in.header.command_id =
>WIRED_INITIATE_HDCP2_SESSION;
>+	session_init_in.header.status = ME_HDCP_STATUS_SUCCESS;
>+	session_init_in.header.buffer_len =
>+
>	WIRED_CMD_BUF_LEN_INITIATE_HDCP2_SESSION_IN;
>+
>+	session_init_in.port.integrated_port_type = data->port_type;
>+	session_init_in.port.physical_port = data->port;
>+	session_init_in.protocol = (uint8_t)data->protocol;
>+
>+	byte = mei_cldev_send(cldev, (u8 *)&session_init_in,
>+			      sizeof(session_init_in));
>+	if (byte < 0) {
>+		dev_dbg(dev, "mei_cldev_send failed. %zd\n", byte);
>+		return byte;
>+	}
>+
>+	byte = mei_cldev_recv(cldev, (u8 *)&session_init_out,
>+			      sizeof(session_init_out));
>+	if (byte < 0) {
>+		dev_dbg(dev, "mei_cldev_recv failed. %zd\n", byte);
>+		return byte;
>+	}
>+
>+	if (session_init_out.header.status != ME_HDCP_STATUS_SUCCESS) {
>+		dev_dbg(dev, "ME cmd 0x%08X Failed. Status: 0x%X\n",
>+			WIRED_INITIATE_HDCP2_SESSION,
>+			session_init_out.header.status);
>+		return -EIO;
>+	}
>+
>+	ake_data->msg_id = HDCP_2_2_AKE_INIT;
>+	ake_data->tx_caps = session_init_out.tx_caps;
>+	memcpy(ake_data->r_tx, session_init_out.r_tx,
>+	       sizeof(session_init_out.r_tx));
>+
>+	return 0;
>+}
>+
> struct i915_hdcp_component_ops mei_hdcp_component_ops = {
> 	.owner					= THIS_MODULE,
>-	.initiate_hdcp2_session			= NULL,
>+	.initiate_hdcp2_session			= mei_initiate_hdcp2_session,
> 	.verify_receiver_cert_prepare_km	= NULL,
> 	.verify_hprime				= NULL,
> 	.store_pairing_info			= NULL,
>--
>2.7.4