linux-kernel - Re: [PATCH 1/2] libata: use sleep instead of standby command

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Date:	Mon, 04 Nov 2013 21:39:10 -0500
From:	Phillip Susi <psusi@...ntu.com>
To:	Aaron Lu <aaron.lu@...el.com>, linux-scsi@...r.kernel.org
CC:	linux-kernel@...r.kernel.org,
	"linux-ide@...r.kernel.org" <linux-ide@...r.kernel.org>,
	Tejun Heo <tj@...nel.org>, Robert Hancock <hancockr@...w.ca>
Subject: Re: [PATCH 1/2] libata: use sleep instead of standby command

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On 11/04/2013 09:23 PM, Aaron Lu wrote:
> I suppose this is mainly for runtime PM? Since for system 
> suspend/hibernation, the disk and its controller will be powered
> off anyway.

Yes, or the second patch also helps when one manually issues hdparm
- -Y, which otherwise will cause the drive to be woken up to answer the
CHECK POWER command, which udisks issues to decide if it should skip
polling the SMART status of the drive.


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