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

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Date:	Fri, 13 Jul 2012 09:56:19 +0100
From:	viresh kumar <viresh.kumar2@....com>
To:	Andy Shevchenko <andy.shevchenko@...il.com>
CC:	viresh kumar <viresh.kumar@...aro.org>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	"linux-kernel@...r.kernel.org" <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

On 13/07/12 09:45, Andy Shevchenko wrote:
>> > To understand it more, what does this mean? We will not support
>> > transfers with unaligned
>> > addresses/length to word size?
> The dmatest module uses those constants to get source, destination
> addresses and length of the test data aligned. On the other hand we
> can't use unaligned address in LLI because of the hardware restriction
> (2 bits are used for choosing AHB master).

To be clear, we can't use unaligned address of an LLI struct, but src/dest
address inside LLI can be unaligned.

I wanted to ask, will normal memcpy for anybody will work with unaligned addresses
with this patch? I believe they will.

--
Viresh



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