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

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Date:	Wed, 02 Jan 2008 13:57:41 -0500
From:	Jeff Garzik <jeff@...zik.org>
To:	Allen Martin <AMartin@...dia.com>
CC:	Robert Hancock <hancockr@...w.ca>, Tejun Heo <htejun@...il.com>,
	Gabor Gombas <gombasg@...aki.hu>, 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:
>> The question I had for NVIDIA regarding this that I never got 
>> answered 
>> was, is there any reason why we would need a delay when switching 
>> between NCQ and non-NCQ commands on ADMA, and if not, is 
>> there any known 
>> cause that could cause the controller to get into this seemingly 
>> locked-up state?
> 
> When switching from NCQ to non NCQ or vice versa you must make sure all
> outstanding commands are completed before issuing the new command.  The
> hardware doesn't do anything to prevent queued and non queued commands
> from going out on the wire at the same time which will certainly cause
> some drives to fail.

The software definitely provides that guarantee for all NCQ-capable 
controllers.

	Jeff



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