Re: [patch 3/3] Enable Aggressive Link Power management for AHCI controllers.

From: Matthew Garrett
Date: Tue Jun 12 2007 - 11:56:58 EST

On Wed, Jun 13, 2007 at 12:45:21AM +0900, Tejun Heo wrote:
> Matthew Garrett wrote:
> > Yes, but they'll also send an ACPI interrupt even if the SATA host
> > controller doesn't - it's part of the spec for bays.
> Does the spec mandate that the ACPI interrupt shouldn't depend on SATA
> phy status? I don't think vendors are likely to implement separate
> mechanism when SATA phy status can do the job fine.

I suspect that the spec allows them to do that, but think that it's
unlikely to actually happen in most cases. Bear in mind that Windows
doesn't tend to drive the hardware in AHCI mode, and that their
implementation is likely to be very similar to the implementation they
used for PATA devices.

Matthew Garrett | mjg59@xxxxxxxxxxxxx
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