linux-kernel - Re: sata_nv + ADMA + Samsung disk problem

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Message-id: <4782BF75.9040803@shaw.ca>
Date:	Mon, 07 Jan 2008 18:10:29 -0600
From:	Robert Hancock <hancockr@...w.ca>
To:	Gabor Gombas <gombasg@...aki.hu>
Cc:	Allen Martin <AMartin@...dia.com>, Mark Lord <lkml@....ca>,
	Jeff Garzik <jeff@...zik.org>, Tejun Heo <htejun@...il.com>,
	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org,
	Kuan Luo <kluo@...dia.com>, Peer Chen <pchen@...dia.com>
Subject: Re: sata_nv + ADMA + Samsung disk problem

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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