Hans Petter Selasky de76cc2ba2
musb_gadget: Fix for spurious interrupts on endpoint zero. ...
There is a multi-year old bug in the MUSB hardware which is not documented.
It causes spurious interrupts and have various symptoms, like endless
"SetupEnd came in a wrong ep0stage" messages. The fix is taken from the
FreeBSD's musb driver.
How to reproduce:
For example issue clear-stall on a couple of endpoints very fast,
like one request per 125us. After a while the bug triggers and the
musb-chip becomes unusable until next re-enumeration.
Signed-off-by: Hans Petter Selasky <hps@bitfrost.no >
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de >
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de76cc2ba2