On Wed, 5 Dec 2012, Sebastian Andrzej Siewior wrote:
> Sarah pointed out that the USB3.0 spec also updates the amount of power
> that may be consumed by the device and quoted 9.2.5.1:
>
> |"The amount of current draw for SuperSpeed devices are increased to 150
> |mA for low-power devices and 900 mA for high-power"
>
> This patch tries to update all users to use the larger values for
> SuperSpeed devices and use the "old" ones for everything else.
>
> While here, two other changes suggested by Alan:
> - the comment referering to 7.2.1.1 has been updated to 7.2.1 which is
> the correct source of the action.
> - the check for hubs with zero ports has been removed.
> @@ -4145,16 +4154,21 @@ hub_power_remaining (struct usb_hub *hub)
> for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
> struct usb_device *udev = hub->ports[port1 - 1]->child;
> int delta;
> + unsigned unit_load;
>
> if (!udev)
> continue;
> + if (hub_is_superspeed(udev))
> + unit_load = 150;
> + else
> + unit_load = 100;
>
> /* Unconfigured devices may not use more than 100mA,
> * or 8mA for OTG ports */
This comment should be updated too (one unit load instead of 100mA).
BTW, does OTG support SuperSpeed?
Alan Stern
--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
