usb: dwc3: gadget: fix isoc END TRANSFER Condition

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There were still some corner cases where isoc transfer was not able to
restart, specially when missed isoc does not happen , and in fact gadget does
not queue any new request during giveback.

Cleanup function calls giveback first, which provides a way to queue
another request to gadget. But gadget did not had any data. So , it did
not call ep_queue. To twist it further, gadget did not queue till
cleanup for last queued TRB is called. If we ever reach this scenario,
we must call END TRANSFER, so that we receive a new  xfernotready with
information about current microframe number.

Also insure that there is no request submitted to core when issuing END
TRANSFER.

Cc: <stable@vger.kernel.org> # v3.8
Signed-off-by: Pratyush Anand <pratyush.anand@st.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

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Pratyush Anand 2013-01-14 15:59:34 +05:30 • committed by Felipe Balbi

parent 15f86bde29

commit cdc359dd87

1 changed files with 18 additions and 5 deletions

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drivers/usb/dwc3/gadget.c

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