linux-kernel - Re: [PATCH 10/18] dmaengine/amba-pl08x: Get rid of pl08x_pre

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Message-ID: <CAOh2x=kRz70etXbaCPO2HCysftyixai44=ZZdLAnZde5N5PmrA@mail.gmail.com>
Date:	Fri, 29 Jul 2011 08:58:48 -0700
From:	viresh kumar <viresh.linux@...il.com>
To:	"Koul, Vinod" <vinod.koul@...el.com>
Cc:	Russell King - ARM Linux <linux@....linux.org.uk>,
	Viresh Kumar <viresh.kumar@...com>, linus.walleij@...aro.org,
	pratyush.anand@...com, rajeev-dlh.kumar@...com,
	bhupesh.sharma@...com, shiraz.hashim@...com,
	linux-kernel@...r.kernel.org, vipin.kumar@...com,
	armando.visconti@...com, amit.virdi@...com,
	vipulkumar.samar@...com, deepak.sikri@...com,
	dan.j.williams@...el.com, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 10/18] dmaengine/amba-pl08x: Get rid of pl08x_pre_boundary()

On 7/29/11, Koul, Vinod <vinod.koul@...el.com> wrote:
> On Fri, 2011-07-29 at 12:05 +0100, Russell King - ARM Linux wrote:
>> On Fri, Jul 29, 2011 at 04:19:20PM +0530, Viresh Kumar wrote:
> Typically in few dmac IPs i know of:
> There is max limitation of what a burst length can be for dma, and what
> a max transfer length can be.
> The dma will push/pull data into peripheral FIFO based on
> max_burst_length parameter (note length in dma terminology is always
> items not bytes, and one item is usually defined as
> transfer_length/src_width). For a transfer (single block or in
> multi-block) the dmac will break the transaction into multiple bursts
> and based on max_burst_length it will push/pull data to/from FIFO. Also
> matching FIFO thresholds with max_burst_length is also important and can
> be tuned based on perf/power requirements.
>
> Sharing my knowledge, hopefully it helps :)
>

Thanks. It was indeed helpful. :)

--
viresh
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