Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32h7/STM32H745_CM4/DSIHOST/DSI_LPCR#0x0
DSI Host LTDC polarity configuration register
DEP
VSP
HSP
https://github.com/modm-io/cmsis-svd-stm32