[PATCH 3/5] ASoC: soc-generic-dmaengine-pcm: Add custom prepare and submit function

[Mark Brown]

On Mon, Nov 16, 2020 at 02:19:03PM +0800, Michael Sit Wei Hong wrote:

> 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.

> The ASoC layers are not aware of such DMA limitation, and the DMA engine
> does not provide an API to set the maximum number of blocks per linked link.

Can we not extend the dmaengine API so that the ASoC layer (and any
other users) can become aware of this limitation and handle it
appropriately rather than jumping straight to some client driver
specific handling?
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