[FIX/Workaround] Touchscreen dead after wake on devices using sec_tsp driver

[Ahad00010]

I encountered an issue on a Samsung device where the touchscreen becomes completely
unresponsive after waking the display when running a GSI.

Device:
Samsung Galaxy A13 (SM-A135F/DS)

ROM:
LineageOS GSI (a64)

Root:
Magisk

Symptom/How to reproduce:
After pressing the power button to wake the display, the touchscreen does not respond.

Manual workaround:
Running the following command restores the touchscreen:

echo check_connection > /sys/class/sec/tsp/cmd
cat /sys/class/sec/tsp/cmd_result

This appears to force the Samsung sec_tsp touchscreen driver to reinitialize.

Automatic workaround (Magisk service.d script):

Create:
/data/adb/service.d/touchfix.sh

Script:

#!/system/bin/sh

logcat -c
logcat -b system | grep -F 'Display device changed state: "Built-in Screen", ON' | while read line
do
  echo check_connection > /sys/class/sec/tsp/cmd
  cat /sys/class/sec/tsp/cmd_result
done

Then run:
chmod 755 /data/adb/service.d/touchfix.sh

After reboot, the touchscreen recovers automatically when the display wakes.

Any credits belongs to: ap4ss3rby because he was the one who actually found the fix and i decided to polish it.