linux-kernel - Re: [PATCH] ep93xx: Implement double buffering for M2M DMA channels

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Date:	Thu, 22 Mar 2012 17:14:12 +0400
From:	Sergei Shtylyov <sshtylyov@...sta.com>
To:	Rafal Prylowski <prylowski@...asoft.pl>
CC:	Ryan Mallon <rmallon@...il.com>,
	"vinod.koul@...el.com" <vinod.koul@...el.com>,
	Mika Westerberg <mika.westerberg@....fi>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	H Hartley Sweeten <hartleys@...ionengravers.com>
Subject: Re: [PATCH] ep93xx: Implement double buffering for M2M DMA channels

Hello.

On 22-03-2012 14:00, Rafal Prylowski wrote:

>> I haven't looked through the patch yet, since I'm waiting on more
>> information from Mika and Hartley's testing.

>> However, the commit log doesn't tell me why we want this change. Is it a
>> performance improvement? If so, do you have some numbers that we can
>> paste into the commit log?

> In principle, using double buffering should be faster than using only
> one buffer and disabling/enabling channel each time. But my measurements
> doesn't show any significant change.

> The real reason for this change is that current code is not 100% reliable
> in IDE-DMA (I'm planning to submit ep93xx ide driver to linux-ide soon).

    IDE or libata driver? Asking because IDE drivers are not accepted anymore.

WBR, Sergei
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