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From: Jeff Garzik <jeff@garzik.org>
To: Richard Crewe <rcrewe@plxtech.com>
Cc: linux-ide@vger.kernel.org, Shane Huang <Shane.Huang@amd.com>
Subject: Re: Soft-reset on a FIS-Based-Switching AHCI interface
Date: Wed, 14 Sep 2011 01:04:32 -0400	[thread overview]
Message-ID: <4E7035E0.3000408@garzik.org> (raw)
In-Reply-To: <4E6E1105.6060103@plxtech.com>

On 09/12/2011 10:02 AM, Richard Crewe wrote:
> The AHCI spec. seems to indicate that a soft-reset can only be performed
> if FBS is disabled.

Can you cite section numbers / specific references for this?


> Looking at the LibATA and LibAHCI code at the moment, I can't see where
> this is done. The soft-reset happens during error recovery when the port
> re-enumerates devices.
>
> Am I missing something or is this a _relatively_ less-well tested area
> of the LibATA/AHCI operation?

I cannot see where FBS is disabled for soft-reset, either.

FBS is pretty new, hasn't changed much at all since its initial 
implementation on an AMD reference board, and is (obviously) only used 
with PMPs.  FBS is a pretty small subset of the total AHCI population, 
so I doubt the code is exercised heavily except for a very few, large 
storage installations.

	Jeff





      reply	other threads:[~2011-09-14  5:12 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-09-12 14:02 Soft-reset on a FIS-Based-Switching AHCI interface Richard Crewe
2011-09-14  5:04 ` Jeff Garzik [this message]

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