Restart power on USB bus/host controller?

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Hi,

I would like to know if it is possible to tell the USBcore/HCD to
restart/reinitialize power to the
USB bus and force redetection of all devices as if the machine has
just booted up?

Sometimes, my usb devices or hubs get into a start that it can not
communicate with the
computer at all.  Disconnecting the usb cable and/or power to the
powered usb hub solve
the problem.  I would like to know if I can so it by software,
controller the driver to issue
a restart on all devices.  Thank you.
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