Subject: Re: [spi-devel-general] Re: [PATCH/RFC] SPI: add DMAUNSAFE analog
	to David Brownell's core
From: dmitry pervushin <dpervushin@gmail.com>
To: Vitaly Wool <vwool@ru.mvista.com>
Cc: Greg KH <greg@kroah.com>, David Brownell <david-b@pacbell.net>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, akpm@osdl.org,
       basicmark@yahoo.com, komal_shah802003@yahoo.com,
       stephen@streetfiresound.com, spi-devel-general@lists.sourceforge.net,
       Joachim_Jaeger@digi.com
In-Reply-To: <43A05C32.3070501@ru.mvista.com>
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	 <20051213195317.29cfd34a.vwool@ru.mvista.com>
	 <200512131101.02025.david-b@pacbell.net> <20051213191531.GA13751@kroah.com>
	 <43A0230B.1040904@ru.mvista.com> <20051214171842.GB30546@kroah.com>
	 <43A05C32.3070501@ru.mvista.com>
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Date: Thu, 15 Dec 2005 13:00:17 +0300
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On Wed, 2005-12-14 at 20:53 +0300, Vitaly Wool wrote:
> Greg KH wrote:
> 
> >What is the speed of your SPI bus?
> >
> >And what are your preformance requirements?
> >  
> >
> The maximum frequency for the SPI bus is 26 MHz, WLAN driver is to work 
> at true 10 Mbit/sec.
My two cents: the faster is better; SPI bus itself can work on 52MHz,
and AFAIK WLAN developers limit the speed due to their firmware
reqiorements.  
> 
> Vitaly
> 
> P. S. I'm speaking not about this particular case during most part of 
> this conversation. Sound cards behind the SPI bus will suffer a lot more 
> since it's their path to use wXrY functions (lotsa small transfers) 
> rather than WLAN's.
> 
> 
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> 

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