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Similarly to what we have done with keyboard events, we put touch events in a FIFO. The AP will need to interpret the timestamp in the events to be able to process the events correctly tough. Resume should typically take about 50ms, so a 8-event long FIFO should be good enough. Also, we bypass the FIFO altogether in most cases, when the USB interface is not suspended. BRANCH=none BUG=b:35775048 TEST=Connect hammer, force autosuspend using: DEVICE=$(dirname $(grep 5022 /sys/bus/usb/devices/*/idProduct)) echo 500 > $DEVICE/power/autosuspend_delay_ms echo auto > $DEVICE/power/control Look at evtest output. Wait a second, make a swipe, see that events are received in a very short amount of time after resume (every EP interval/2ms), but the event timestamps show that some of them are older. Change-Id: If6ab56396f7d564b19e6c3c528847196ffa4d849 Signed-off-by: Nicolas Boichat <drinkcat@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/612221 Reviewed-by: Vincent Palatin <vpalatin@chromium.org>