From mboxrd@z Thu Jan  1 00:00:00 1970
From: viresh.kumar@st.com (Viresh Kumar)
Date: Tue, 17 Jan 2012 14:45:31 +0530
Subject: [PATCH 8/8] dmaengine/dw_dmac: Add support for DMA_SLAVE_CONFIG
In-Reply-To: <CACRpkdbY7ZOwY6GR4t+GODYL4yAdH-PXExmwp84R+Gz2W19X7w@mail.gmail.com>
References: <cover.1326707233.git.viresh.kumar@st.com>
 <7c1e6fd573d5cd348b22f8363c9960fe5efcd658.1326707233.git.viresh.kumar@st.com>
 <4F140D25.1000309@st.com>
 <CACRpkdbY7ZOwY6GR4t+GODYL4yAdH-PXExmwp84R+Gz2W19X7w@mail.gmail.com>
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To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

On 1/17/2012 2:19 PM, Linus Walleij wrote:
> Are you looking for ffs() from <linus/bitops.h>?
> 
> find-first-set (the include boils down to include/asm-generic/bitops/ffs.h
> if you want to check the implementation).

Thanks, but it might not solve the issue. :(
Actually this will retain the first Least Significant Bit (which is 1)
and will mark all other zero. So it will give output 0b10 for 0b110

>>> >> +      * Fix sconfig's burst size according to dw_dmac. We need to convert
>>> >> +      * them as: 1 -> 0, 2 -> 1, 4 -> 2, 8 -> 3, 16 -> 4.

I need above conversion. i.e. finding bit no. of first bit set.

-- 
viresh