How to enable the triple buffer function of LCD for other SPIs?

I designed a new OpenMV4Plus PCB. In order to retain the same IO as the original version, I used SPI5 to drive the LCD. This was successful by modifying ports in the firmware. But I can’t enable the triple buffer function,and can’t find where I need to modify. Do you know how to make it work?

I don’t have any idea what’s wrong. You have to ask a detailed question about a detailed problem.