linux-kernel - Re: ata link not reset properly

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Message-ID: <4C279814.9030100@ru.mvista.com>
Date:	Sun, 27 Jun 2010 22:27:32 +0400
From:	Sergei Shtylyov <sshtylyov@...sta.com>
To:	Robert Hancock <hancockrwd@...il.com>
CC:	Ortwin Glück <odi@....ch>,
	Tejun Heo <tj@...nel.org>, linux-kernel@...r.kernel.org,
	linux-ide@...r.kernel.org
Subject: Re: ata link not reset properly

Hello.

Robert Hancock wrote:

>> On 25.06.2010 17:19, Tejun Heo wrote:
>>> Patch attached, but please see below.

>> Cheers, I will give it a try and provide feedback if "it" happens again.

>>> Is it PATA?

>> Yes. This chipset doesn't have SATA, only PATA.

> Ahh, ok, it's not sata_nv at all then, it's pata_amd. On the same chip, 
> totally different controller though.

> PATA doesn't normally use hard-resets as a means of error recovery - 
> that would mean hitting the RESET line, which I don't think most 
> controllers can do on software command (it usually only gets asserted on 
> power up or hitting the reset button), unlike on SATA where there's a 
> defined way to trigger a COMRESET which is mostly equivalent. Also, that 
> resets both devices on the channel, unlike soft reset which is specific 
> to one device.

    PATA soft reset affects both devices too. Unless you mean ATAPI Device 
Reset command.

MBR, Sergei

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