musb core and overcurrent devices

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Hi,

I notice from the mainline 2.6.39 musb_core.c driver that when
multiple (VBUS_RETRY_COUNT) VBUS errors occur; the driver considers
this as an overcurrent condition and sets the PORT OVERCURRENT flags
and VBUS is then turned off.

I'm trying to understand how the system recovers from this? For
example if you insert a device that draws to much current - how does
it then detect that the condition has gone away without repeatedly
turning VBUS back on/off? Is there a piece of the puzzle I'm missing?
(I'm not yet too familiar with USB).

Thanks,

Andrew Murray
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