Re: REQ_PM vs REQ_TYPE_PM_RESUME

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On 01/07/2014 09:11 PM, Aaron Lu wrote:
> I thought that feature is used to control if a disk should be spun
> up once powered from the host side.

That *is* what it sounds like, only ATA disks either spin up as soon
as power is applied, or wait for an actual command issued by higher
layers.  There doesn't seem to be any low level SATA mechanism to spin
the drive up that the SSS feature could toggle, so it seems to simply
be a hint to libata, and possibly the bios.

> Too bad for a jumper, that's beyond our control. And about the
> hdparm, does the setting survive a power cycle?

Yes, otherwise there wouldn't be much point to a setting that only
matters at power on ;)


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