[RFC PATCH 2/4] ASoC: soc-generic-dmaengine-pcm: Add custom prepare and submit function

[Andy Shevchenko]

On Tue, Nov 17, 2020 at 04:03:48PM +0800, Michael Sit Wei Hong wrote:
> Enabling custom prepare and submit function to overcome DMA limitation.
> 
> In the Intel KeemBay solution, the DW AXI-based DMA has a limitation on
> the number of DMA blocks per transfer. In the case of 16 bit audio ASoC
> would allocate blocks exceeding the DMA block limitation.

I'm still not sure the hardware has such a limitation.

The Synopsys IP supports linked list (LLI) transfers and I hardly can
imagine the list has any limitation. Even though, one can always emulate
LLI in software how it's done in the DesignWare AHB DMA driver.

I have briefly read chapter 4.6 "AXI_DMA" of Keem Bay TRM and didn't
find any errata or limits like this.

-- 
With Best Regards,
Andy Shevchenko