Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32f7/STM32F767/DSI/DSI_WCFGR#0x0
DSI Wrapper Configuration Register
DSI Mode
Color Multiplexing
TE Source
TE Polarity
Automatic Refresh
VSync Polarity
https://github.com/modm-io/cmsis-svd-stm32