Messages in this thread | | | Date | Thu, 21 Jul 2016 12:26:48 +0800 | From | zhangfei <> | Subject | Re: [PATCH 6/7] k3dma: Fix occasional DMA ERR issue by using proper dma api |
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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
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