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Linux/AM3352: USB babble patch

Part Number: AM3352

Tool/software: Linux

SDK version: linux-3.2.0-psp04.06.00.11. 

insert U-flash, AM335x can recognize it, remove u-flash, console keep print:  ti81xx_interrupt 1146: VBUS error workaround (delay coming), and can't recognize USB device anymore, USB0_DRVVBUS turn from high to low. 

Execute script: echo F > /proc/driver/musb_hdrc.0 can turn USB0_DRVVBUS to high, and insert U-flash, can recognize again.

I remember the USB babble patch should be able to recover USB to normal status automatically. Is USB babble patch in this version PSP already?

Or is it due to AM335x did not trigger babble interrupt?