Re: [U-Boot] [PATCH 16/16] usb: xhci: Enable TT to support LS/FS devices behind a HS hub

On 23 June 2017 at 03:54, Bin Meng bmeng.cn@gmail.com wrote:

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: Bin Meng bmeng.cn@gmail.com

drivers/usb/host/xhci-mem.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+)

Reviewed-by: Simon Glass sjg@chromium.org