Re: [PATCH] ata: ahci: power off unused ports

[Jeff Garzik]

Alan Cox wrote:
> > If you are talking about SATA -- incorrect.
> >
> > The patch deals with policy, and the user MUST have the ability to 
> > control this stuff.  Otherwise you create a situation where the user 
> > might be denied hotplug use in valid cases, or similar negative situations.
>
> The policy isn't however complicated. Tejun added the stuff for forcing
> cable type and mode on setup and has therefore written all the per device
> setup code we might need. Alternatively a single
>
> 	foo=1/0
>
> option has been fine for acpi and will do fine for this. Total additional
> cost - 1 line.

The key requirement is per-port control.  Ideally via hdparm or another 
userspace tool, but kernel command line (module options) or sysfs would 
be just fine too.  And agreed, the minimal you need is simply 1/0 for 
the port's policy.

	Jeff



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