Xhci Host not allowed to send get device desc at addr zero

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Hi,

I'm using Kernel release 3.4 with an embedded xhci host controller
Seems USB core driver does not allow xhci controller to send a get device descriptor at address zero
As when a device is attached to the root hub, usb core driver reset the device and if the link is superspeed than do a set_address

LeCroy Compliance test TD7.06 Data Payload Packet Framing Robustness test script expects for get device descriptor at  @ zero from host

How to let xhci controller sending a get device descriptor command before setting an address to  USB3 device ?

Thanks,
Aymen
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