linux-kernel - Re: [PATCH 1/2] Add COH 901 318 DMA block driver

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Date:	Tue, 22 Sep 2009 08:33:22 -0700
From:	Daniel Walker <dwalker@...o99.com>
To:	Linus Walleij <linus.walleij@...ricsson.com>
Cc:	Maciej Sosnowski <maciej.sosnowski@...el.com>,
	Dan Williams <dan.j.williams@...el.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] Add COH 901 318 DMA block driver

On Tue, 2009-09-22 at 16:38 +0200, Linus Walleij wrote:
> +       val &= ~COH901318_CX_CFG_CH_ENABLE;
> +       writel(val, virtbase + COH901318_CX_CFG +
> +              COH901318_CX_CFG_SPACING * channel);
> +
> +       writel(val, virtbase + COH901318_CX_CFG +
> +              COH901318_CX_CFG_SPACING * channel);
> +       wmb();
> +
> +       /* Spin-wait for it to actually go inactive */
> +       while (readl(virtbase + COH901318_CX_STAT+COH901318_CX_STAT_SPACING *
> +                    channel) & COH901318_CX_STAT_ACTIVE) {}

You might want to add a cpu_relax() here ..

Daniel



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