I have a latency issue when using UART on Raspberry Pi 2 and I want to disable DMA when using UART driver. I know that the Raspberry Pi 2 uses
ampa_pl011 and I don't want use DMA. Can you tell me how to do that on this driver?
I tried to comment this line in
pl011_startup() function but seem that it not effect.
/* Startup DMA */ //pl011_dma_startup(uap);
Have anything more that we need to change?