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

[Matthew Garrett <mjg59@srcf.ucam.org>]

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@srcf.ucam.org
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