drm/i915/hdcp: Propagate aux info in DP HDCP functions

We were propagating dig_port info to dp hdcp2 specific functions.
Let us clean that up and send intel_connector in the following
functions: intel_dp_hdcp2_wait_for_msg, get_receiver_id_list_rx_info,
intel_dp_hdcp2_read_rx_status.
This optimises mst scenarios where aux ends up being remote and not
stored in dig_port and dig_port can always be derived from
intel_connector if needed.

--v2
-Fix Typo [Arun]
-Dont pass drm_dp core structures [Arun]
-Fix commit message styling [Arun]
Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com>
Reviewed-by: Arun R Murthy <arun.r.murthy@intel.com>
Signed-off-by: Uma Shankar <uma.shankar@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230828063850.604048-1-suraj.kandpal@intel.com

drivers/gpu/drm/i915/display/intel_dp_hdcp.c

@@ -331,10 +331,11 @@ static const struct hdcp2_dp_msg_data hdcp2_dp_msg_data[] = {
 };
 
 static int
-intel_dp_hdcp2_read_rx_status(struct intel_digital_port *dig_port,
+intel_dp_hdcp2_read_rx_status(struct intel_connector *connector,
 			      u8 *rx_status)
 {
-	struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
+	struct drm_i915_private *i915 = to_i915(connector->base.dev);
+	struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
 	ssize_t ret;
 
 	ret = drm_dp_dpcd_read(&dig_port->dp.aux,
@@ -350,14 +351,14 @@ intel_dp_hdcp2_read_rx_status(struct intel_digital_port *dig_port,
 }
 
 static
-int hdcp2_detect_msg_availability(struct intel_digital_port *dig_port,
+int hdcp2_detect_msg_availability(struct intel_connector *connector,
 				  u8 msg_id, bool *msg_ready)
 {
 	u8 rx_status;
 	int ret;
 
 	*msg_ready = false;
-	ret = intel_dp_hdcp2_read_rx_status(dig_port, &rx_status);
+	ret = intel_dp_hdcp2_read_rx_status(connector, &rx_status);
 	if (ret < 0)
 		return ret;
 
@@ -383,12 +384,11 @@ int hdcp2_detect_msg_availability(struct intel_digital_port *dig_port,
 }
 
 static ssize_t
-intel_dp_hdcp2_wait_for_msg(struct intel_digital_port *dig_port,
+intel_dp_hdcp2_wait_for_msg(struct intel_connector *connector,
 			    const struct hdcp2_dp_msg_data *hdcp2_msg_data)
 {
-	struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
-	struct intel_dp *dp = &dig_port->dp;
-	struct intel_hdcp *hdcp = &dp->attached_connector->hdcp;
+	struct drm_i915_private *i915 = to_i915(connector->base.dev);
+	struct intel_hdcp *hdcp = &connector->hdcp;
 	u8 msg_id = hdcp2_msg_data->msg_id;
 	int ret, timeout;
 	bool msg_ready = false;
@@ -411,8 +411,8 @@ intel_dp_hdcp2_wait_for_msg(struct intel_digital_port *dig_port,
 		 * the timeout at wait for CP_IRQ.
 		 */
 		intel_dp_hdcp_wait_for_cp_irq(hdcp, timeout);
-		ret = hdcp2_detect_msg_availability(dig_port,
-						    msg_id, &msg_ready);
+		ret = hdcp2_detect_msg_availability(connector, msg_id,
+						    &msg_ready);
 		if (!msg_ready)
 			ret = -ETIMEDOUT;
 	}
@@ -445,6 +445,7 @@ int intel_dp_hdcp2_write_msg(struct intel_connector *connector,
 	u8 *byte = buf;
 	ssize_t ret, bytes_to_write, len;
 	const struct hdcp2_dp_msg_data *hdcp2_msg_data;
+	struct drm_dp_aux *aux;
 
 	hdcp2_msg_data = get_hdcp2_dp_msg_data(*byte);
 	if (!hdcp2_msg_data)
@@ -452,6 +453,8 @@ int intel_dp_hdcp2_write_msg(struct intel_connector *connector,
 
 	offset = hdcp2_msg_data->offset;
 
+	aux = &dig_port->dp.aux;
+
 	/* No msg_id in DP HDCP2.2 msgs */
 	bytes_to_write = size - 1;
 	byte++;
@@ -460,7 +463,7 @@ int intel_dp_hdcp2_write_msg(struct intel_connector *connector,
 		len = bytes_to_write > DP_AUX_MAX_PAYLOAD_BYTES ?
 				DP_AUX_MAX_PAYLOAD_BYTES : bytes_to_write;
 
-		ret = drm_dp_dpcd_write(&dig_port->dp.aux,
+		ret = drm_dp_dpcd_write(aux,
 					offset, (void *)byte, len);
 		if (ret < 0)
 			return ret;
@@ -474,8 +477,10 @@ int intel_dp_hdcp2_write_msg(struct intel_connector *connector,
 }
 
 static
-ssize_t get_receiver_id_list_rx_info(struct intel_digital_port *dig_port, u32 *dev_cnt, u8 *byte)
+ssize_t get_receiver_id_list_rx_info(struct intel_connector *connector,
+				     u32 *dev_cnt, u8 *byte)
 {
+	struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
 	ssize_t ret;
 	u8 *rx_info = byte;
 
@@ -500,8 +505,7 @@ int intel_dp_hdcp2_read_msg(struct intel_connector *connector,
 {
 	struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
 	struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
-	struct intel_dp *dp = &dig_port->dp;
-	struct intel_hdcp *hdcp = &dp->attached_connector->hdcp;
+	struct intel_hdcp *hdcp = &connector->hdcp;
 	unsigned int offset;
 	u8 *byte = buf;
 	ssize_t ret, bytes_to_recv, len;
@@ -515,7 +519,7 @@ int intel_dp_hdcp2_read_msg(struct intel_connector *connector,
 		return -EINVAL;
 	offset = hdcp2_msg_data->offset;
 
-	ret = intel_dp_hdcp2_wait_for_msg(dig_port, hdcp2_msg_data);
+	ret = intel_dp_hdcp2_wait_for_msg(connector, hdcp2_msg_data);
 	if (ret < 0)
 		return ret;
 
@@ -525,7 +529,7 @@ int intel_dp_hdcp2_read_msg(struct intel_connector *connector,
 	byte++;
 
 	if (msg_id == HDCP_2_2_REP_SEND_RECVID_LIST) {
-		ret = get_receiver_id_list_rx_info(dig_port, &dev_cnt, byte);
+		ret = get_receiver_id_list_rx_info(connector, &dev_cnt, byte);
 		if (ret < 0)
 			return ret;
 
@@ -609,7 +613,8 @@ int intel_dp_hdcp2_check_link(struct intel_digital_port *dig_port,
 	u8 rx_status;
 	int ret;
 
-	ret = intel_dp_hdcp2_read_rx_status(dig_port, &rx_status);
+	ret = intel_dp_hdcp2_read_rx_status(connector,
+					    &rx_status);
 	if (ret)
 		return ret;