STM32H7 add ADIS16470 spi 16bit not use

I use CUAV X7 pro have tried to add ADIS16470 , but 16bit spi not use, spi6 dma not use yet, unused DMA result in high cpu utilization, someone has same problem, now i saved spi6 dma problems .

I have faced the same problem and could not figure out.

Now i use 2 8bit can use ,but not use DMA