diff mbox series

[v4,13/14] drm/mst: Add support for QUERY_STREAM_ENCRYPTION_STATUS MST sideband message

Message ID 20200218220242.107265-14-sean@poorly.run (mailing list archive)
State New, archived
Headers show
Series drm/i915: Add support for HDCP 1.4 over MST connectors | expand

Commit Message

Sean Paul Feb. 18, 2020, 10:02 p.m. UTC 
From: Sean Paul <seanpaul@chromium.org>

Used to query whether an MST stream is encrypted or not.

Cc: Lyude Paul <lyude@redhat.com>
Signed-off-by: Sean Paul <seanpaul@chromium.org>

Changes in v4:
-Added to the set
---
 drivers/gpu/drm/drm_dp_mst_topology.c | 117 ++++++++++++++++++++++++++
 include/drm/drm_dp_helper.h           |   3 +
 include/drm/drm_dp_mst_helper.h       |  44 ++++++++++
 3 files changed, 164 insertions(+)

Comments

Lyude Paul Feb. 28, 2020, 10:51 p.m. UTC | #1 
Hey - I've got a good bit of stuff on my plate right now since I just got back
from PTO and am going through my backlog of stuff, but I'll try to get this
reviewed first chance I get

On Tue, 2020-02-18 at 17:02 -0500, Sean Paul wrote:
> From: Sean Paul <seanpaul@chromium.org>
> 
> Used to query whether an MST stream is encrypted or not.
> 
> Cc: Lyude Paul <lyude@redhat.com>
> Signed-off-by: Sean Paul <seanpaul@chromium.org>
> 
> Changes in v4:
> -Added to the set
> ---
>  drivers/gpu/drm/drm_dp_mst_topology.c | 117 ++++++++++++++++++++++++++
>  include/drm/drm_dp_helper.h           |   3 +
>  include/drm/drm_dp_mst_helper.h       |  44 ++++++++++
>  3 files changed, 164 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c
> b/drivers/gpu/drm/drm_dp_mst_topology.c
> index a811247cecfef..30b6dc6ce54c2 100644
> --- a/drivers/gpu/drm/drm_dp_mst_topology.c
> +++ b/drivers/gpu/drm/drm_dp_mst_topology.c
> @@ -25,6 +25,7 @@
>  #include <linux/i2c.h>
>  #include <linux/init.h>
>  #include <linux/kernel.h>
> +#include <linux/random.h>
>  #include <linux/sched.h>
>  #include <linux/seq_file.h>
>  
> @@ -418,6 +419,22 @@ drm_dp_encode_sideband_req(const struct
> drm_dp_sideband_msg_req_body *req,
>  		memcpy(&buf[idx], req->u.i2c_write.bytes, req-
> >u.i2c_write.num_bytes);
>  		idx += req->u.i2c_write.num_bytes;
>  		break;
> +	case DP_QUERY_STREAM_ENC_STATUS: {
> +		const struct drm_dp_query_stream_enc_status *msg;
> +
> +		msg = &req->u.enc_status;
> +		buf[idx] = msg->stream_id;
> +		idx++;
> +		memcpy(&buf[idx], msg->client_id, sizeof(msg->client_id));
> +		idx += sizeof(msg->client_id);
> +		buf[idx] = 0;
> +		buf[idx] |= msg->stream_event & GENMASK(1, 0);
> +		buf[idx] |= msg->valid_stream_event ? BIT(2) : 0;
> +		buf[idx] |= (msg->stream_behavior & GENMASK(1, 0)) << 3;
> +		buf[idx] |= msg->valid_stream_behavior ? BIT(5) : 0;
> +		idx++;
> +		}
> +		break;
>  	}
>  	raw->cur_len = idx;
>  }
> @@ -926,6 +943,34 @@ static bool
> drm_dp_sideband_parse_power_updown_phy_ack(struct drm_dp_sideband_ms
>  	return true;
>  }
>  
> +static bool
> +drm_dp_sideband_parse_query_stream_enc_status(
> +				struct drm_dp_sideband_msg_rx *raw,
> +				struct drm_dp_sideband_msg_reply_body *repmsg)
> +{
> +	struct drm_dp_query_stream_enc_status_ack_reply *reply;
> +
> +	reply = &repmsg->u.enc_status;
> +
> +	reply->stream_id = raw->msg[3];
> +
> +	reply->reply_signed = raw->msg[2] & BIT(0);
> +
> +	reply->hdcp_1x_device_present = raw->msg[2] & BIT(3);
> +	reply->hdcp_2x_device_present = raw->msg[2] & BIT(4);
> +
> +	reply->query_capable_device_present = raw->msg[2] & BIT(5);
> +	reply->legacy_device_present = raw->msg[2] & BIT(6);
> +	reply->unauthorizable_device_present = raw->msg[2] & BIT(7);
> +
> +	reply->auth_completed = !!(raw->msg[1] & BIT(3));
> +	reply->encryption_enabled = !!(raw->msg[1] & BIT(4));
> +	reply->repeater_present = !!(raw->msg[1] & BIT(5));
> +	reply->state = (raw->msg[1] & GENMASK(7, 6)) >> 6;
> +
> +	return true;
> +}
> +
>  static bool drm_dp_sideband_parse_reply(struct drm_dp_sideband_msg_rx *raw,
>  					struct drm_dp_sideband_msg_reply_body
> *msg)
>  {
> @@ -960,6 +1005,8 @@ static bool drm_dp_sideband_parse_reply(struct
> drm_dp_sideband_msg_rx *raw,
>  		return drm_dp_sideband_parse_power_updown_phy_ack(raw, msg);
>  	case DP_CLEAR_PAYLOAD_ID_TABLE:
>  		return true; /* since there's nothing to parse */
> +	case DP_QUERY_STREAM_ENC_STATUS:
> +		return drm_dp_sideband_parse_query_stream_enc_status(raw,
> msg);
>  	default:
>  		DRM_ERROR("Got unknown reply 0x%02x (%s)\n", msg->req_type,
>  			  drm_dp_mst_req_type_str(msg->req_type));
> @@ -1113,6 +1160,25 @@ static int build_power_updown_phy(struct
> drm_dp_sideband_msg_tx *msg,
>  	return 0;
>  }
>  
> +static int
> +build_query_stream_enc_status(struct drm_dp_sideband_msg_tx *msg, u8
> stream_id,
> +			      u8 *q_id)
> +{
> +	struct drm_dp_sideband_msg_req_body req;
> +
> +	req.req_type = DP_QUERY_STREAM_ENC_STATUS;
> +	req.u.enc_status.stream_id = stream_id;
> +	memcpy(req.u.enc_status.client_id, q_id,
> +	       sizeof(req.u.enc_status.client_id));
> +	req.u.enc_status.stream_event = 0;
> +	req.u.enc_status.valid_stream_event = false;
> +	req.u.enc_status.stream_behavior = 0;
> +	req.u.enc_status.valid_stream_behavior = false;
> +
> +	drm_dp_encode_sideband_req(&req, msg);
> +	return 0;
> +}
> +
>  static int drm_dp_mst_assign_payload_id(struct drm_dp_mst_topology_mgr
> *mgr,
>  					struct drm_dp_vcpi *vcpi)
>  {
> @@ -3154,6 +3220,57 @@ int drm_dp_send_power_updown_phy(struct
> drm_dp_mst_topology_mgr *mgr,
>  }
>  EXPORT_SYMBOL(drm_dp_send_power_updown_phy);
>  
> +int drm_dp_send_query_stream_enc_status(struct drm_dp_mst_topology_mgr
> *mgr,
> +		struct drm_dp_mst_port *port,
> +		struct drm_dp_query_stream_enc_status_ack_reply *status)
> +{
> +	struct drm_dp_sideband_msg_tx *txmsg;
> +	u8 nonce[7];
> +	int len, ret;
> +
> +	txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
> +	if (!txmsg)
> +		return -ENOMEM;
> +
> +	port = drm_dp_mst_topology_get_port_validated(mgr, port);
> +	if (!port) {
> +		ret = -EINVAL;
> +		goto out_get_port;
> +	}
> +
> +	get_random_bytes(nonce, sizeof(nonce));
> +
> +	/*
> +	 * "Source device targets the QUERY_STREAM_ENCRYPTION_STATUS message
> +	 *  transaction at the MST Branch device directly connected to the
> +	 *  Source"
> +	 */
> +	txmsg->dst = mgr->mst_primary;
> +
> +	len = build_query_stream_enc_status(txmsg, port->vcpi.vcpi, nonce);
> +
> +	drm_dp_queue_down_tx(mgr, txmsg);
> +
> +	ret = drm_dp_mst_wait_tx_reply(mgr->mst_primary, txmsg);
> +	if (ret < 0) {
> +		goto out;
> +	} else if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK) {
> +		DRM_DEBUG_KMS("query encryption status nak received\n");
> +		ret = -ENXIO;
> +		goto out;
> +	}
> +
> +	ret = 0;
> +	memcpy(status, &txmsg->reply.u.enc_status, sizeof(*status));
> +
> +out:
> +	drm_dp_mst_topology_put_port(port);
> +out_get_port:
> +	kfree(txmsg);
> +	return ret;
> +}
> +EXPORT_SYMBOL(drm_dp_send_query_stream_enc_status);
> +
>  static int drm_dp_create_payload_step1(struct drm_dp_mst_topology_mgr *mgr,
>  				       int id,
>  				       struct drm_dp_payload *payload)
> diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
> index b8f6bac6341c1..11b2c49e4f0f4 100644
> --- a/include/drm/drm_dp_helper.h
> +++ b/include/drm/drm_dp_helper.h
> @@ -1099,6 +1099,9 @@
>  #define DP_POWER_DOWN_PHY		0x25
>  #define DP_SINK_EVENT_NOTIFY		0x30
>  #define DP_QUERY_STREAM_ENC_STATUS	0x38
> +#define  DP_QUERY_STREAM_ENC_STATUS_STATE_NO_EXIST	0
> +#define  DP_QUERY_STREAM_ENC_STATUS_STATE_INACTIVE	1
> +#define  DP_QUERY_STREAM_ENC_STATUS_STATE_ACTIVE	2
>  
>  /* DP 1.2 MST sideband reply types */
>  #define DP_SIDEBAND_REPLY_ACK		0x00
> diff --git a/include/drm/drm_dp_mst_helper.h
> b/include/drm/drm_dp_mst_helper.h
> index 5483f888712ad..baf3405df44d8 100644
> --- a/include/drm/drm_dp_mst_helper.h
> +++ b/include/drm/drm_dp_mst_helper.h
> @@ -305,6 +305,34 @@ struct drm_dp_remote_i2c_write_ack_reply {
>  	u8 port_number;
>  };
>  
> +struct drm_dp_query_stream_enc_status_ack_reply {
> +	/* Bit[23:16]- Stream Id */
> +	u8 stream_id;
> +
> +	/* Bit[15]- Signed */
> +	bool reply_signed;
> +
> +	/* Bit[10:8]- Stream Output Sink Type */
> +	bool unauthorizable_device_present;
> +	bool legacy_device_present;
> +	bool query_capable_device_present;
> +
> +	/* Bit[12:11]- Stream Output CP Type */
> +	bool hdcp_1x_device_present;
> +	bool hdcp_2x_device_present;
> +
> +	/* Bit[4]- Stream Authentication */
> +	bool auth_completed;
> +
> +	/* Bit[3]- Stream Encryption */
> +	bool encryption_enabled;
> +
> +	/* Bit[2]- Stream Repeater Function Present */
> +	bool repeater_present;
> +
> +	/* Bit[1:0]- Stream State */
> +	u8 state;
> +};
>  
>  struct drm_dp_sideband_msg_rx {
>  	u8 chunk[48];
> @@ -378,6 +406,15 @@ struct drm_dp_remote_i2c_write {
>  	u8 *bytes;
>  };
>  
> +struct drm_dp_query_stream_enc_status {
> +	u8 stream_id;
> +	u8 client_id[7];	/* 56-bit nonce */
> +	u8 stream_event;
> +	bool valid_stream_event;
> +	u8 stream_behavior;
> +	u8 valid_stream_behavior;
> +};
> +
>  /* this covers ENUM_RESOURCES, POWER_DOWN_PHY, POWER_UP_PHY */
>  struct drm_dp_port_number_req {
>  	u8 port_number;
> @@ -426,6 +463,8 @@ struct drm_dp_sideband_msg_req_body {
>  
>  		struct drm_dp_remote_i2c_read i2c_read;
>  		struct drm_dp_remote_i2c_write i2c_write;
> +
> +		struct drm_dp_query_stream_enc_status enc_status;
>  	} u;
>  };
>  
> @@ -448,6 +487,8 @@ struct drm_dp_sideband_msg_reply_body {
>  		struct drm_dp_remote_i2c_read_ack_reply remote_i2c_read_ack;
>  		struct drm_dp_remote_i2c_read_nak_reply remote_i2c_read_nack;
>  		struct drm_dp_remote_i2c_write_ack_reply remote_i2c_write_ack;
> +
> +		struct drm_dp_query_stream_enc_status_ack_reply enc_status;
>  	} u;
>  };
>  
> @@ -804,6 +845,9 @@ drm_dp_atomic_release_vcpi_slots(struct drm_atomic_state
> *state,
>  				 struct drm_dp_mst_port *port);
>  int drm_dp_send_power_updown_phy(struct drm_dp_mst_topology_mgr *mgr,
>  				 struct drm_dp_mst_port *port, bool power_up);
> +int drm_dp_send_query_stream_enc_status(struct drm_dp_mst_topology_mgr
> *mgr,
> +		struct drm_dp_mst_port *port,
> +		struct drm_dp_query_stream_enc_status_ack_reply *status);
>  int __must_check drm_dp_mst_atomic_check(struct drm_atomic_state *state);
>  
>  void drm_dp_mst_get_port_malloc(struct drm_dp_mst_port *port);
diff mbox series

Patch

diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c
index a811247cecfef..30b6dc6ce54c2 100644
--- a/drivers/gpu/drm/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/drm_dp_mst_topology.c
@@ -25,6 +25,7 @@ 
 #include <linux/i2c.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
+#include <linux/random.h>
 #include <linux/sched.h>
 #include <linux/seq_file.h>
 
@@ -418,6 +419,22 @@  drm_dp_encode_sideband_req(const struct drm_dp_sideband_msg_req_body *req,
 		memcpy(&buf[idx], req->u.i2c_write.bytes, req->u.i2c_write.num_bytes);
 		idx += req->u.i2c_write.num_bytes;
 		break;
+	case DP_QUERY_STREAM_ENC_STATUS: {
+		const struct drm_dp_query_stream_enc_status *msg;
+
+		msg = &req->u.enc_status;
+		buf[idx] = msg->stream_id;
+		idx++;
+		memcpy(&buf[idx], msg->client_id, sizeof(msg->client_id));
+		idx += sizeof(msg->client_id);
+		buf[idx] = 0;
+		buf[idx] |= msg->stream_event & GENMASK(1, 0);
+		buf[idx] |= msg->valid_stream_event ? BIT(2) : 0;
+		buf[idx] |= (msg->stream_behavior & GENMASK(1, 0)) << 3;
+		buf[idx] |= msg->valid_stream_behavior ? BIT(5) : 0;
+		idx++;
+		}
+		break;
 	}
 	raw->cur_len = idx;
 }
@@ -926,6 +943,34 @@  static bool drm_dp_sideband_parse_power_updown_phy_ack(struct drm_dp_sideband_ms
 	return true;
 }
 
+static bool
+drm_dp_sideband_parse_query_stream_enc_status(
+				struct drm_dp_sideband_msg_rx *raw,
+				struct drm_dp_sideband_msg_reply_body *repmsg)
+{
+	struct drm_dp_query_stream_enc_status_ack_reply *reply;
+
+	reply = &repmsg->u.enc_status;
+
+	reply->stream_id = raw->msg[3];
+
+	reply->reply_signed = raw->msg[2] & BIT(0);
+
+	reply->hdcp_1x_device_present = raw->msg[2] & BIT(3);
+	reply->hdcp_2x_device_present = raw->msg[2] & BIT(4);
+
+	reply->query_capable_device_present = raw->msg[2] & BIT(5);
+	reply->legacy_device_present = raw->msg[2] & BIT(6);
+	reply->unauthorizable_device_present = raw->msg[2] & BIT(7);
+
+	reply->auth_completed = !!(raw->msg[1] & BIT(3));
+	reply->encryption_enabled = !!(raw->msg[1] & BIT(4));
+	reply->repeater_present = !!(raw->msg[1] & BIT(5));
+	reply->state = (raw->msg[1] & GENMASK(7, 6)) >> 6;
+
+	return true;
+}
+
 static bool drm_dp_sideband_parse_reply(struct drm_dp_sideband_msg_rx *raw,
 					struct drm_dp_sideband_msg_reply_body *msg)
 {
@@ -960,6 +1005,8 @@  static bool drm_dp_sideband_parse_reply(struct drm_dp_sideband_msg_rx *raw,
 		return drm_dp_sideband_parse_power_updown_phy_ack(raw, msg);
 	case DP_CLEAR_PAYLOAD_ID_TABLE:
 		return true; /* since there's nothing to parse */
+	case DP_QUERY_STREAM_ENC_STATUS:
+		return drm_dp_sideband_parse_query_stream_enc_status(raw, msg);
 	default:
 		DRM_ERROR("Got unknown reply 0x%02x (%s)\n", msg->req_type,
 			  drm_dp_mst_req_type_str(msg->req_type));
@@ -1113,6 +1160,25 @@  static int build_power_updown_phy(struct drm_dp_sideband_msg_tx *msg,
 	return 0;
 }
 
+static int
+build_query_stream_enc_status(struct drm_dp_sideband_msg_tx *msg, u8 stream_id,
+			      u8 *q_id)
+{
+	struct drm_dp_sideband_msg_req_body req;
+
+	req.req_type = DP_QUERY_STREAM_ENC_STATUS;
+	req.u.enc_status.stream_id = stream_id;
+	memcpy(req.u.enc_status.client_id, q_id,
+	       sizeof(req.u.enc_status.client_id));
+	req.u.enc_status.stream_event = 0;
+	req.u.enc_status.valid_stream_event = false;
+	req.u.enc_status.stream_behavior = 0;
+	req.u.enc_status.valid_stream_behavior = false;
+
+	drm_dp_encode_sideband_req(&req, msg);
+	return 0;
+}
+
 static int drm_dp_mst_assign_payload_id(struct drm_dp_mst_topology_mgr *mgr,
 					struct drm_dp_vcpi *vcpi)
 {
@@ -3154,6 +3220,57 @@  int drm_dp_send_power_updown_phy(struct drm_dp_mst_topology_mgr *mgr,
 }
 EXPORT_SYMBOL(drm_dp_send_power_updown_phy);
 
+int drm_dp_send_query_stream_enc_status(struct drm_dp_mst_topology_mgr *mgr,
+		struct drm_dp_mst_port *port,
+		struct drm_dp_query_stream_enc_status_ack_reply *status)
+{
+	struct drm_dp_sideband_msg_tx *txmsg;
+	u8 nonce[7];
+	int len, ret;
+
+	txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
+	if (!txmsg)
+		return -ENOMEM;
+
+	port = drm_dp_mst_topology_get_port_validated(mgr, port);
+	if (!port) {
+		ret = -EINVAL;
+		goto out_get_port;
+	}
+
+	get_random_bytes(nonce, sizeof(nonce));
+
+	/*
+	 * "Source device targets the QUERY_STREAM_ENCRYPTION_STATUS message
+	 *  transaction at the MST Branch device directly connected to the
+	 *  Source"
+	 */
+	txmsg->dst = mgr->mst_primary;
+
+	len = build_query_stream_enc_status(txmsg, port->vcpi.vcpi, nonce);
+
+	drm_dp_queue_down_tx(mgr, txmsg);
+
+	ret = drm_dp_mst_wait_tx_reply(mgr->mst_primary, txmsg);
+	if (ret < 0) {
+		goto out;
+	} else if (txmsg->reply.reply_type == DP_SIDEBAND_REPLY_NAK) {
+		DRM_DEBUG_KMS("query encryption status nak received\n");
+		ret = -ENXIO;
+		goto out;
+	}
+
+	ret = 0;
+	memcpy(status, &txmsg->reply.u.enc_status, sizeof(*status));
+
+out:
+	drm_dp_mst_topology_put_port(port);
+out_get_port:
+	kfree(txmsg);
+	return ret;
+}
+EXPORT_SYMBOL(drm_dp_send_query_stream_enc_status);
+
 static int drm_dp_create_payload_step1(struct drm_dp_mst_topology_mgr *mgr,
 				       int id,
 				       struct drm_dp_payload *payload)
diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
index b8f6bac6341c1..11b2c49e4f0f4 100644
--- a/include/drm/drm_dp_helper.h
+++ b/include/drm/drm_dp_helper.h
@@ -1099,6 +1099,9 @@ 
 #define DP_POWER_DOWN_PHY		0x25
 #define DP_SINK_EVENT_NOTIFY		0x30
 #define DP_QUERY_STREAM_ENC_STATUS	0x38
+#define  DP_QUERY_STREAM_ENC_STATUS_STATE_NO_EXIST	0
+#define  DP_QUERY_STREAM_ENC_STATUS_STATE_INACTIVE	1
+#define  DP_QUERY_STREAM_ENC_STATUS_STATE_ACTIVE	2
 
 /* DP 1.2 MST sideband reply types */
 #define DP_SIDEBAND_REPLY_ACK		0x00
diff --git a/include/drm/drm_dp_mst_helper.h b/include/drm/drm_dp_mst_helper.h
index 5483f888712ad..baf3405df44d8 100644
--- a/include/drm/drm_dp_mst_helper.h
+++ b/include/drm/drm_dp_mst_helper.h
@@ -305,6 +305,34 @@  struct drm_dp_remote_i2c_write_ack_reply {
 	u8 port_number;
 };
 
+struct drm_dp_query_stream_enc_status_ack_reply {
+	/* Bit[23:16]- Stream Id */
+	u8 stream_id;
+
+	/* Bit[15]- Signed */
+	bool reply_signed;
+
+	/* Bit[10:8]- Stream Output Sink Type */
+	bool unauthorizable_device_present;
+	bool legacy_device_present;
+	bool query_capable_device_present;
+
+	/* Bit[12:11]- Stream Output CP Type */
+	bool hdcp_1x_device_present;
+	bool hdcp_2x_device_present;
+
+	/* Bit[4]- Stream Authentication */
+	bool auth_completed;
+
+	/* Bit[3]- Stream Encryption */
+	bool encryption_enabled;
+
+	/* Bit[2]- Stream Repeater Function Present */
+	bool repeater_present;
+
+	/* Bit[1:0]- Stream State */
+	u8 state;
+};
 
 struct drm_dp_sideband_msg_rx {
 	u8 chunk[48];
@@ -378,6 +406,15 @@  struct drm_dp_remote_i2c_write {
 	u8 *bytes;
 };
 
+struct drm_dp_query_stream_enc_status {
+	u8 stream_id;
+	u8 client_id[7];	/* 56-bit nonce */
+	u8 stream_event;
+	bool valid_stream_event;
+	u8 stream_behavior;
+	u8 valid_stream_behavior;
+};
+
 /* this covers ENUM_RESOURCES, POWER_DOWN_PHY, POWER_UP_PHY */
 struct drm_dp_port_number_req {
 	u8 port_number;
@@ -426,6 +463,8 @@  struct drm_dp_sideband_msg_req_body {
 
 		struct drm_dp_remote_i2c_read i2c_read;
 		struct drm_dp_remote_i2c_write i2c_write;
+
+		struct drm_dp_query_stream_enc_status enc_status;
 	} u;
 };
 
@@ -448,6 +487,8 @@  struct drm_dp_sideband_msg_reply_body {
 		struct drm_dp_remote_i2c_read_ack_reply remote_i2c_read_ack;
 		struct drm_dp_remote_i2c_read_nak_reply remote_i2c_read_nack;
 		struct drm_dp_remote_i2c_write_ack_reply remote_i2c_write_ack;
+
+		struct drm_dp_query_stream_enc_status_ack_reply enc_status;
 	} u;
 };
 
@@ -804,6 +845,9 @@  drm_dp_atomic_release_vcpi_slots(struct drm_atomic_state *state,
 				 struct drm_dp_mst_port *port);
 int drm_dp_send_power_updown_phy(struct drm_dp_mst_topology_mgr *mgr,
 				 struct drm_dp_mst_port *port, bool power_up);
+int drm_dp_send_query_stream_enc_status(struct drm_dp_mst_topology_mgr *mgr,
+		struct drm_dp_mst_port *port,
+		struct drm_dp_query_stream_enc_status_ack_reply *status);
 int __must_check drm_dp_mst_atomic_check(struct drm_atomic_state *state);
 
 void drm_dp_mst_get_port_malloc(struct drm_dp_mst_port *port);