linux-kernel - Re: [PATCH v3 2/2] dma/imx-sdma: use writel to write register when enable a channel

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Message-ID: <20120105095413.GD1729@S2101-09.ap.freescale.net>
Date:	Thu, 5 Jan 2012 17:54:15 +0800
From:	Shawn Guo <shawn.guo@...aro.org>
To:	Richard Zhao <richard.zhao@...escale.com>
Cc:	Richard Zhao <richard.zhao@...aro.org>,
	Arnd Bergmann <arnd@...db.de>, patches@...aro.org,
	vinod.koul@...el.com, linux-kernel@...r.kernel.org,
	eric.miao@...aro.org, kernel@...gutronix.de,
	dan.j.williams@...el.com, linux-arm-kernel@...ts.infradead.org
Subject: 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.

-- 
Regards,
Shawn
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