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On some EHCI usb debug controllers, the EHCI debug device will fail to be seen after a port reset, after a warm reset. Two options exist to get the device to initialize correctly. Option 1 is to unplug and plug in the device. Option 2 is to use the EHCI port test to get the usb debug device to start talking again. At that point the debug controller port reset will succeed. Signed-off-by: Jason Wessel <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: Andrew Morton <[email protected]> Cc: Yinghai Lu <[email protected]> Cc: "Eric W. Biederman" <[email protected]> CC: [email protected] Signed-off-by: Greg Kroah-Hartman <[email protected]>