You can try https://github.com/prenticedavid/Adafruit_GC9102_kbv
This library is not ready for public Release yet. Please offer some feedback.
Run the GC9106_rotation.ino example
If you have 3.3V logic you can run the ST7789_readreg_diag.ino example. Please copy-paste the output to your message.
David.