Re: Blackberry driver and pm

On Mon, Feb 05, 2007 at 11:19:48PM +0100, Oliver Neukum wrote:
> 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);

Ok, again, I don't see this as being an issue from any other device that
is on the bus, asking for power, yet not having any driver bound to it.

Or is this in relation to the autosuspend issues?

thanks,

greg k-h

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