Use your WaveShare Raspberry Pi LCD in ex. RetroPie
Install Waveshare official drivers for your LCD screen, then:
git clone https://github.com/k073l/WaveShare-Screen-Enable.git
cd WaveShare-Screen-Enable
chmod +x waveshare_screen_enable.sh
sudo ./waveshare_screen_enable
Hope it will work on your screen too!