Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32h7/STM32H745_CM4/DSIHOST/DSI_WPCR4#0x0
DSI wrapper PHY configuration register 4
TCLKPOST
https://github.com/modm-io/cmsis-svd-stm32