Re: [PATCH v5 16/16] dmaengine: dw-axi-dmac: Virtually split the linked-list

[Andy Shevchenko]

On Mon, Nov 23, 2020 at 10:34:52AM +0800, Sia Jee Heng wrote:
> AxiDMA driver exposed the dma_set_max_seg_size() to the DMAENGINE.
> It shall helps the DMA clients to create size-optimized linked-list
> for the controller.
> 
> However, there are certain situations where DMA client might not be
> abled to benefit from the dma_get_max_seg_size() if the segment size
> can't meet the nature of the DMA client's operation.
> 
> In the case of ALSA operation, ALSA application and driver expecting
> to run in a period of larger than 10ms regardless of the bit depth.
> With this large period, there is a strong request to split the linked-list
> in the AxiDMA driver.

I'm wondering why ASoC generic code can't use DMA channel and device
capabilities and prepare SG list with all limitations taken into account.


-- 
With Best Regards,
Andy Shevchenko