Re: [PATCH 6/7] k3dma: Fix occasional DMA ERR issue by using proper dma api

[zhangfei]

On 07/21/2016 11:53 AM, John Stultz wrote:
> After lots of debugging on an occasional DMA ERR issue, I realized
> that the desc structures which we point the dma hardware are being
> allocated out of regular memory. This means when we fill the desc
> structures, that data doesn't always get flushed out to memory by
> the time we start the dma transfer, resulting in the dma engine getting
> some null values, resulting in a DMA ERR on the first irq.

How about using wmb() flush before start dma to sync desc?

I remember I used dma_pool first, then do some optimization referring 
Russell's driver.

Thanks