disp: msm: dp: add debug node to capture source and sink crc

This change adds a debug node named 'crc' to drm_dp to read
the frame CRC values for DP controller and DP Sink. In order
to facilitate the immediate read of the CRC values when
accessed, it enables the CRC calculation on the controller
and sink automatically when the stream is enabled. In addition
to the frame CRC values it also reads the MISR values from
controller and PHY to validate the data flow from controller
to PHY.

Change-Id: I1acee2dba931e4635caf4a400e336a72c86e88bf
Signed-off-by: Rajkumar Subbiah <quic_rsubbia@quicinc.com>

msm/dp/dp_ctrl.h

@@ -1,5 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 /*
+ * Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved.
  * Copyright (c) 2012-2021, The Linux Foundation. All rights reserved.
  */
 
@@ -32,6 +33,8 @@ struct dp_ctrl {
 			enum dp_stream_id strm,
 			u32 ch_start_slot, u32 ch_tot_slots);
 	void (*set_sim_mode)(struct dp_ctrl *dp_ctrl, bool en);
+	int (*setup_misr)(struct dp_ctrl *dp_ctrl);
+	int (*read_misr)(struct dp_ctrl *dp_ctrl, struct dp_misr40_data *data);
 };
 
 struct dp_ctrl_in {