On 16 April 2018 at 23:35, Vinod Koul <vinod.k...@intel.com> wrote: > On Mon, Apr 16, 2018 at 02:32:05PM +0800, Baolin Wang wrote: > >> >> Beside the general configuration, our audio driver will configure the >> >> fragment length, block length, maybe transaction length, and they must >> >> specify the request type and interrupt type, these are what we want to >> >> export for users. >> > >> > As I said before, you need to derive fragment, block or transaction from >> >> I am sorry I did not make things clear here. What I mean is not only >> link list mode(prep_cyclic), but also other modes (prep_slave, >> prep_interleaved ...), users still need to configure the fragment >> length, block length or transaction length according to their >> requirements. > > Other modes are similar, they also use the parameters programmed from > dma_slave_config. Pls see other driver examples. IIRC dw dma has > similar capabilities but not all are exposed to user and driver configures.
I'll check the dw dma. Really thanks for your help :) -- Baolin.wang Best Regards