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From: Viresh Kumar <viresh.kumar@st.com>
To: Linus Walleij <linus.walleij@linaro.org>
Cc: "vinod.koul@intel.com" <vinod.koul@intel.com>,
	"dan.j.williams@intel.com" <dan.j.williams@intel.com>,
	"linux@arm.linux.org.uk" <linux@arm.linux.org.uk>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-arm-kernel@lists.infradead.org" 
	<linux-arm-kernel@lists.infradead.org>,
	Armando VISCONTI <armando.visconti@st.com>,
	Shiraz HASHIM <shiraz.hashim@st.com>,
	Vipin KUMAR <vipin.kumar@st.com>,
	Rajeev KUMAR <rajeev-dlh.kumar@st.com>,
	Deepak SIKRI <deepak.sikri@st.com>,
	Vipul Kumar SAMAR <vipulkumar.samar@st.com>,
	Amit VIRDI <Amit.VIRDI@st.com>,
	Pratyush ANAND <pratyush.anand@st.com>,
	Bhupesh SHARMA <bhupesh.sharma@st.com>,
	"viresh.linux@gmail.com" <viresh.linux@gmail.com>,
	Bhavna YADAV <bhavna.yadav@st.com>,
	Vincenzo FRASCINO <Vincenzo.FRASCINO@st.com>,
	Mirko GARDI <mirko.gardi@st.com>
Subject: Re: [PATCH 8/8] dmaengine/dw_dmac: Add support for DMA_SLAVE_CONFIG
Date: Tue, 17 Jan 2012 14:45:31 +0530	[thread overview]
Message-ID: <4F153C33.5060805@st.com> (raw)
In-Reply-To: <CACRpkdbY7ZOwY6GR4t+GODYL4yAdH-PXExmwp84R+Gz2W19X7w@mail.gmail.com>

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

  reply	other threads:[~2012-01-17  9:16 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-01-16  9:50 [PATCH 0/9] dmaengine: Pl08x and dw_dmac updates Viresh Kumar
2012-01-16  9:50 ` [PATCH 1/8] dmaengine/dw_dmac: Hibernation support in dw_dmac Viresh Kumar
2012-01-16  9:50 ` [PATCH 2/8] dmaengine: Add flow controller information to dma_slave_config Viresh Kumar
2012-01-17  8:37   ` Linus Walleij
2012-01-17  9:07     ` Viresh Kumar
2012-01-18 10:36       ` Linus Walleij
2012-01-18 10:40         ` Viresh Kumar
2012-01-16  9:50 ` [PATCH 3/8] dmaengine/amba-pl08x: Take flow controller info from DMA_SLAVE_CONFIG Viresh Kumar
2012-01-16  9:50 ` [PATCH 4/8] dmaengine/dw_dmac: Don't use magic number for total number of channels Viresh Kumar
2012-01-16  9:50 ` [PATCH 5/8] dmaengine/dw_dmac: Use platform_get_drvdata instead of accessing dev directly Viresh Kumar
2012-01-16 10:47   ` Sergei Shtylyov
2012-01-16 10:52     ` Viresh Kumar
2012-01-16  9:50 ` [PATCH 6/8] dmaengine/dw_dmac: Don't handle block interrupts Viresh Kumar
2012-01-16  9:50 ` [PATCH 7/8] dmaengine/dw_dmac: Unmap all memory buffers after completion of slave transfers Viresh Kumar
2012-01-16 10:54   ` Russell King - ARM Linux
2012-01-16 11:44     ` Viresh Kumar
2012-01-17  8:52       ` Linus Walleij
2012-01-17  9:07         ` Viresh Kumar
2012-01-18  9:35           ` Russell King - ARM Linux
2012-01-19 17:34           ` Linus Walleij
2012-01-16  9:50 ` [PATCH 8/8] dmaengine/dw_dmac: Add support for DMA_SLAVE_CONFIG Viresh Kumar
2012-01-16 11:42   ` Viresh Kumar
2012-01-17  8:49     ` Linus Walleij
2012-01-17  9:15       ` Viresh Kumar [this message]
2012-01-17  9:19         ` Viresh Kumar
2012-01-17 10:19         ` Viresh Kumar
2012-01-17 10:10     ` Jassi Brar
2012-01-17 10:19       ` Viresh Kumar

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