Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32f7/STM32F767/DSI/DSI_GPDR#0x0
DSI Host Generic Payload Data Register
Payload Byte 1
Payload Byte 2
Payload Byte 3
Payload Byte 4
https://github.com/modm-io/cmsis-svd-stm32