PCIe controller of i.MX8MM DMA transfer support

[yasunori_suzuki]

I have a question about PCIe controller of i.MX8MM.

Can  I use DMA transfer in RC mode?

Linux driver implemented DMA transfer in EP mode only.

But i.MX8MM reference manual seems like PCIe controller supports DMA tarnsfer RC mode and EP mode.  

BSP version is L4.14.98 2.00ga.

[weidong_sun]

Hi 康議 鈴木,

According to the PCIe protocol, the DMA is initiated by the EP, and the RC side does not operate the DMA.

For example:

If I.MX8MM is used as EP, PCIe driver will operate DMA to transfer data.

Hope above information is helpful for you!

B.R,

Weidong