Re: [PATCH v2 3/6] dmaengine: dw: Set DMA device max segment size parameter

Vineet Gupta
2020-05-08T18:49:30Z

On 5/8/20 4:21 AM, Andy Shevchenko wrote:
> Yeah, I have locally something like this and I didn't dare to upstream because
> there is an issue. We have this information per DMA controller, while we
> actually need this on per DMA channel basis.
>
> Above will work only for synthesized DMA with all channels having same block
> size. That's why above conditional is not needed anyway.
>
> OTOH, I never saw the DesignWare DMA to be synthesized differently (I remember
> that Intel Medfield has interesting settings, but I don't remember if DMA
> channels are different inside the same controller).
>
> Vineet, do you have any information that Synopsys customers synthesized DMA
> controllers with different channel characteristics inside one DMA IP?

The IP drivers are done by different teams, but I can try and ask around.