linux-kernel - Re: [PATCH] New AT91 MCI Driver that supports both MCI slots used at the same time

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Message-ID: <4A269A83.3020008@drewtech.com>
Date:	Wed, 03 Jun 2009 11:45:07 -0400
From:	Joey Oravec <joravec@...wtech.com>
To:	Nicolas Ferre <nicolas.ferre@...el.com>
CC:	Rob Emanuele <poorarm@...reis.com>,
	linux-arm-kernel@...ts.arm.linux.org.uk,
	linux-kernel@...r.kernel.org,
	Haavard Skinnemoen <hskinnemoen@...el.com>
Subject: Re: [PATCH] New AT91 MCI Driver that supports both MCI slots used
 at 	the same time

Nicolas Ferre wrote:
> This systematic reset was remove by Haavard with this comment:
> "Also, don't reset the controller between each transfer. That was an
> attempt to work around earlier bugs, and it never really worked very
> well."
>   
See: 
http://lists.arm.linux.org.uk/lurker/message/20090409.120542.4f74c08d.en.html

I disagree with Haavard. Without the reset my sam9261 would exhibit DAT0 
contention, early interrupts, and other problems. Adding the reset was a 
major improvement. I emailed you some screenshots on April 10 2009 that 
demonstrate my testing. Let me know offline if either you or Havaard did 
not get the email and I can resend.

Maybe the problems are limited to this chip? We should discuss this further.

-joey

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