From mboxrd@z Thu Jan  1 00:00:00 1970
From: Mark Lord <kernel@teksavvy.com>
Subject: Re: ahci: CAP_SSS and parallel scan
Date: Thu, 06 May 2010 16:19:22 -0400
Message-ID: <4BE3244A.7060607@teksavvy.com>
References: <4BE27C49.5090809@kernel.org> <4BE28C4F.9000903@linux.intel.com> <4BE2D5D6.1010705@kernel.org>
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To: Tejun Heo <tj@kernel.org>
Cc: Arjan van de Ven <arjan@linux.intel.com>, Jeff Garzik <jeff@garzik.org>, t.artem@mailcity.com, "linux-ide@vger.kernel.org" <linux-ide@vger.kernel.org>

On 06/05/10 03:49 PM, Jeff Garzik wrote:
>
>> Currently, there's no way to tell whether staggered spin up is needed
>> or drives are already spun up.

Perhaps by issuing a "CHECK POWER MODE" command?
For many drives, a non-spinning drive is detectable from its IDENTIFY data.

Cheers