Hi!
> > What the PM stuff in the kernel does is to handle power management for
> > the Host Controller. It needs to be reset when full power is reapplied to
> > the device. That's what this patch does.
> I think that there is more too it than this, since it seems that such
> things as suspend-to-RAM don't take all the power away (depending on
> APM
On my toshiba, power to usb devices goes off at
suspend-to-ram. (Toshiba can't do suspend to disk, I guess I could use
swsusp patches for that).
> or ACPI implementation). It should be possible to suspend the USB bus
> traffic (i.e. Global Suspend) without powering off the host controller.
> If not, then how does IAPC work on a USB keyboard or mouse?
> Now if the Host Controller is really getting powered off, why do we need
> to:
> case PM_SUSPEND:
> reset_hc(uhci);
> break;
> If it is going to be powered off, who cares about the state?
This seems to be required for correct work of usb after power-on ;-?.
> > This isn't to say what you're talking isn't necessary, but for right now
> > since PM is in it's infancy under Linux, I think partial support is fine
> > for 2.4 atleast.
> I agree it is better, and I don't see it as a show-stopper for 2.4. I
> just don't think it is as good as it could be. And I really do want my
> laptop to be able to do resume (and remote wakeup, eventually) from a
> global suspend (and maybe a selective suspend when there are user space
> tools to control it) and I don't want to get devices randomly reassigned
> when that happens.
This is required for usb to be usable on my notebook, otherwise HCD is
dead after resume and only reboot cures that.
Pavel
--
I'm [EMAIL PROTECTED] "In my country we have almost anarchy and I don't care."
Panos Katsaloulis describing me w.r.t. patents me at [EMAIL PROTECTED]
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