linux-kernel - Re: [PATCH 1/1] libata: ahci_start

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Message-ID: <BANLkTinYzLJAPdpNsZYuDML0eszgw00JcQ@mail.gmail.com>
Date:	Sat, 23 Apr 2011 16:40:44 +0200
From:	Tejun Heo <htejun@...il.com>
To:	Jian Peng <jipeng2005@...il.com>
Cc:	Jeff Garzik <jgarzik@...ox.com>, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] libata: ahci_start_engine compliant to AHCI spec

On Sat, Apr 23, 2011 at 8:58 AM, Jian Peng <jipeng2005@...il.com> wrote:
> At the end of section 10.1 of AHCI spec (rev 1.3), it states
>
> Software shall not set PxCMD.ST to 1 until it is determined that
> a functoinal device is present on the port as determined by
> PxTFD.STS.BSY=0, PxTFD.STS.DRQ=0 and PxSSTS.DET=3h
>
> Even though most AHCI host controller works without this check,
> specific controller will fail under this condition.
>
> Signed-off-by: Jian Peng <jipeng2005@...il.com>

Acked-by: Tejun Heo <tj@...nel.org>

Thanks.

-- 
tejun
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