linux-kernel - Re: [PATCH 3/3] dw_dmac: set default alignment

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Message-ID: <CAOh2x=k6MDt5arZfPgrn8_tPu_zgPsD2e5y0-JyUkrx71Z6BNQ@mail.gmail.com>
Date:	Fri, 13 Jul 2012 09:26:32 +0100
From:	viresh kumar <viresh.kumar@...aro.org>
To:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:	linux-kernel@...r.kernel.org, Vinod Koul <vinod.koul@...el.com>,
	Dan Williams <dan.j.williams@...el.com>,
	spear-devel <spear-devel@...t.st.com>
Subject: Re: [PATCH 3/3] dw_dmac: set default alignment

It would be nice to keep spear-devel in cc, as this is the second
platform that uses this driver.

On Fri, Jul 13, 2012 at 9:09 AM, Andy Shevchenko
<andriy.shevchenko@...ux.intel.com> wrote:
> The default values are filled to support at least mem-to-mem tests provided by
> dmatest module. It makes sense to choose the 4 bytes (2 least significant bits)
> alignment by the default.
>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
>  drivers/dma/dw_dmac.c |    6 ++++++
>  1 file changed, 6 insertions(+)
>
> diff --git a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c
> index 3d061c6..2a19ab6 100644
> --- a/drivers/dma/dw_dmac.c
> +++ b/drivers/dma/dw_dmac.c
> @@ -1485,6 +1485,12 @@ static int __devinit dw_probe(struct platform_device *pdev)
>         dw->dma.device_tx_status = dwc_tx_status;
>         dw->dma.device_issue_pending = dwc_issue_pending;
>
> +       /* Set default alignment */
> +       dw->dma.copy_align = 2;
> +       dw->dma.xor_align = 2;
> +       dw->dma.pq_align = 2;
> +       dw->dma.fill_align = 2;

To understand it more, what does this mean? We will not support
transfers with unaligned
addresses/length to word size?

--
viresh
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