linux-kernel - Re: [PATCH][RFC] fsldma: fix performance degradation by optimizing spinlock use.

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Message-ID: <CAOZdJXWX9EHfcXTuVag+-MvUvqnA7bA5RjmLx4jE5Cu5JmQdvg@mail.gmail.com>
Date:	Wed, 30 Nov 2011 00:08:44 +0000
From:	Tabi Timur-B04825 <B04825@...escale.com>
To:	"Ira W. Snyder" <iws@...o.caltech.edu>
CC:	Li Yang-R58472 <r58472@...escale.com>,
	Shi Xuelin-B29237 <B29237@...escale.com>,
	"vinod.koul@...el.com" <vinod.koul@...el.com>,
	"dan.j.williams@...el.com" <dan.j.williams@...el.com>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH][RFC] fsldma: fix performance degradation by optimizing
 spinlock use.

On Tue, Nov 29, 2011 at 11:25 AM, Ira W. Snyder <iws@...o.caltech.edu> wrote:

> I believe that you are correct, for powerpc. However, anything outside
> of arch/powerpc shouldn't assume it only runs on powerpc. I wouldn't be
> surprised to see fsldma running on an iMX someday (ARM processor).

I certainly would.  The i.MX chips have their own DMA controller.  The
DMA controller that fsldma.c works with is unique to Freescale's 83xx,
85xx, and QorIQ chips.

-- 
Timur Tabi
Linux kernel developer at Freescale
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