Linux/PROCESSOR-SDK-AM437X: Can't calibrate touchscreen

Tool/software: Linux

Dear friends 

I cant calibrate touch screen on am4379 evm board with ts_calibrate.

URL : processors.wiki.ti.com/.../How_to_Recalibrate_the_Touchscreen

I followed the above url reference to recalbrate touchscreen but no luck .I did stop matrix application when the calibration start but the cross hair is still unresponsive.

I already cross checked my usb touch driver it was detected by kernel and done the event test using evetest

I am using Processor SDK version "ti-processor-sdk-linux-rt-am437x-evm-03.03.00.04"

This is my evm board kernel version

Linux am437x-evm 4.4.41-rt50-g968d071ce9 #71 PREEMPT RT Mon Apr 2 16:03:52 CST 2018 armv7l GNU/Linux

Help me out to resolve this issue

Thanks and regard

vivekyuvan