Re: Blackberry driver and pm

Am Montag, 5. Februar 2007 23:05 schrieb Greg KH:
> On Mon, Feb 05, 2007 at 09:28:28AM +0100, Oliver Neukum wrote:
> > Hi,
> > 
> > I was looking again at the Blackberry driver and its implications for
> > power management.
> > You are using the magic command always if you see the descriptor
> > for 100 mA. If you are on a battery powered hub after the reset, usbcore
> > won't choose a configuration. So far everything works as planned.
> 
> No, it will choose the 500mA config as that's all that is available.
> Remember, the device disconnects itself from the bus and then comes back
> as a whole new one, with a new power request.  So that is when the
> determination is done.

choose_configuration() can refuse:
	if (insufficient_power > 0)
		dev_info(&udev->dev, "rejected %d configuration%s "
			"due to insufficient available bus power\n",
			insufficient_power, plural(insufficient_power));

	if (best) {
		i = best->desc.bConfigurationValue;
		dev_info(&udev->dev,
			"configuration #%d chosen from %d choice%s\n",
			i, num_configs, plural(num_configs));
	} else {
		i = -1;
		dev_warn(&udev->dev,
			"no configuration chosen from %d choice%s\n",
			num_configs, plural(num_configs));
	}
	return i;
}

generic_probe() will set no configuration:
	c = choose_configuration(udev);
	if (c >= 0) {
		err = usb_set_configuration(udev, c);

	Regards
		Oliver

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