Re: [PATCH v3 2/2] dma/imx-sdma: use writel to write register when enable a channel
On Thu, Jan 05, 2012 at 05:19:05PM +0800, Richard Zhao wrote: > Russel mentioned that too. But I cannot understand. > If CONFIG_ARM_DMA_MEM_BUFFERABLE, readl/writel always call rmb/wmb. Do > we realy need it? It might affect performance. > For safety, I think we need it. The operations should be really fast.