Date: Mon, 07 Jan 2008 18:10:29 -0600
From: Robert Hancock <hancockr@shaw.ca>
Subject: Re: sata_nv + ADMA + Samsung disk problem
In-reply-to: <F72FA20C31DD4F4C997B91C5B3690A09505598@hqemmail07.nvidia.com>
To: Gabor Gombas <gombasg@sztaki.hu>
Cc: Allen Martin <AMartin@nvidia.com>, Mark Lord <lkml@rtr.ca>,
       Jeff Garzik <jeff@garzik.org>, Tejun Heo <htejun@gmail.com>,
       linux-kernel@vger.kernel.org, linux-ide@vger.kernel.org,
       Kuan Luo <kluo@nvidia.com>, Peer Chen <pchen@nvidia.com>
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Allen Martin wrote:
>  
>>> Dunno about the NVidia version.
>> Theirs works rather differently - the GO bit is there, but there's 
>> another append register which is used to tell the controller 
>> that a new 
>> tag has been added to the CPB list.
>>
>> The only thing we currently use the GO bit for is to switch 
>> between ADMA 
>> and port register mode. Could be there's something we need to 
>> do there, 
>> though, who knows..
>>
> 
> You shouldn't ever need to touch GO other than the ADMA / legacy mode
> switch as you say.
> 
> The NVIDIA ADMA hw is not based on the Pacific Digital core.

Gabor, I just noticed you said that it worked OK in 2.6.20, yet 2.6.22 
fails. 2.6.20 had ADMA support as well, so I wonder what change started 
causing the problem. Would it be possible for you to do a git bisect (or 
at least try 2.6.21 to try and narrow it down)?
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