On Wed, Sep 17, 2014 at 11:55 PM, Maxime Ripard
<maxime.ripard@xxxxxxxxxxxxxxxxxx> wrote:
> On Tue, Sep 16, 2014 at 10:13:27PM +0800, Chen-Yu Tsai wrote:
>> >> + /*
>> >> + * sun8i variant requires us to toggle an undocumented register,
>> >> + * as seen in Allwinner's SDK.
>> >
>> > The BSP I have has this:
>> >
>> > static void sunxi_dma_hw_init(struct sunxi_dmadev *dev)
>> > {
>> > struct sunxi_dmadev *sunxi_dev = dev;
>> >
>> > clk_prepare_enable(sunxi_dev->ahb_clk);
>> > #ifdef CONFIG_ARCH_SUN8IW3
>> > writel(0x04, sunxi_dev->base + DMA_GATE);
>> > #endif
>> > }
>> >
>> > /* All is ok, and open the clock */
>> > sunxi_dma_hw_init(sunxi_dev);
>> >
>> > So I guess we can say that it's not that undocumented :)
>>
>> That's right. I meant undocumented in the user manual.
>> I did reference the SDK in the comment, didn't I? :)
>
> So something like
>
> writel(DMA_GATE_ENABLE, base->DMA_GATE_REG) wouldn't be too far off :)
Sure. Will also update the comment to reflect the naming.
ChenYu
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