usb: xhci: Enable TT to support LS/FS devices behind a HS hub
So far LS/FS devices directly attached to xHC root port can be successfully enumerated by xHCI driver, but if they are connected behind a hub, the enumeration process fails to address the device. It turns out xHCI driver still misses a part that in the device's input slot context, all Transaction Translator (TT) related fields are not programmed. The xHCI spec defines how to enable TT. Now LS/FS devices like USB keyboard/mouse can be enumerated behind a high speed hub. Signed-off-by: NBin Meng <bmeng.cn@gmail.com> Reviewed-by: NSimon Glass <sjg@chromium.org>
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