Re: [PATCH v3] dmaengine: add CSR SiRFprimaII DMAC driver
From: Linus Walleij
Date: Mon Oct 17 2011 - 10:10:24 EST
On Mon, Oct 17, 2011 at 3:57 PM, Vinod Koul <vinod.koul@xxxxxxxxx> wrote:
>> + if (sdesc->cyclic) {
>> + writel((1 << cid) | 1 << (cid + 16) |
>> + readl_relaxed(sdma->base + SIRFSOC_DMA_CH_LOOP_CTRL),
>> + sdma->base + SIRFSOC_DMA_CH_LOOP_CTRL);
>> + schan->happened_cyclic = schan->completed_cyclic = 0;
>> + }
>
> any reason why we have mixed use of writel_relaxes and writel?
> Shouldn't all the DMA register writes be done only using writel?
We has a lengthy discussion on the subject here:
http://marc.info/?l=linux-arm-kernel&m=130588591415130&w=2
Yours,
Linus Walleij
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