linux-kernel - Re: [PATCH v3] dmaengine: add CSR SiRFprimaII DMAC driver

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Date:	Mon, 17 Oct 2011 16:10:22 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Vinod Koul <vinod.koul@...el.com>
Cc:	Barry Song <Barry.Song@....com>, Arnd Bergmann <arnd@...db.de>,
	Jassi Brar <jaswinder.singh@...aro.org>,
	linux-kernel@...r.kernel.org, workgroup.linux@....com,
	Rongjun Ying <rongjun.ying@....com>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3] dmaengine: add CSR SiRFprimaII DMAC driver

On Mon, Oct 17, 2011 at 3:57 PM, Vinod Koul <vinod.koul@...el.com> 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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