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Message-ID: <4FFFE2B3.3040306@arm.com>
Date: Fri, 13 Jul 2012 09:56:19 +0100
From: viresh kumar <viresh.kumar2@arm.com>
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To: Andy Shevchenko <andy.shevchenko@gmail.com>
CC: viresh kumar <viresh.kumar@linaro.org>,
        Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Vinod Koul <vinod.koul@intel.com>,
        Dan Williams <dan.j.williams@intel.com>,
        spear-devel <spear-devel@list.st.com>
Subject: Re: [PATCH 3/3] dw_dmac: set default alignment
References: <1342166974-4490-1-git-send-email-andriy.shevchenko@linux.intel.com> <1342166974-4490-3-git-send-email-andriy.shevchenko@linux.intel.com> <CAOh2x=k6MDt5arZfPgrn8_tPu_zgPsD2e5y0-JyUkrx71Z6BNQ@mail.gmail.com> <CAHp75VfiyLJKdSogHRDqU1TC-3icKAhCXa0hWbfnWEcNmJosTQ@mail.gmail.com>
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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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