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Instead of enabling the SOF calibration at usb_init(), enable it only when the first SOF packet is seen following the usb_init(), as suggested in the recommendations document linked from the bug report. Also fix the code to do the right thing. The original reference code had errors. BUG=chrome-os-partner:50800 BRANCH=none TEST=make buildall; test on Cr50 After adding some instrumentation code, I see the SOF being detected and the calibration started. It only happens once after each usb_init() and only when the USB traffic begins. Change-Id: Id2b9a41d90ce9cc9e467fb759463d69a57bb5540 Signed-off-by: Bill Richardson <wfrichar@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/350371 Reviewed-by: Mary Ruthven <mruthven@chromium.org>