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When the power supply voltage is transitioning to a lower value, use the discharging FET to ensure that the voltage is acceptable before re-enabling the output. Note: when discharging, we must disable the fast OCP ADC interrupt, but that is ok because we still have the slow OCP check in board_checks(). BRANCH=none BUG=chrome-os-partner:28332 TEST=on Zinger, transition from 20V to 5V using Firefly buttons and observe that we no longer have an over-voltage event. Also, verified that fast OCP triggering still works after a discharge. Change-Id: Ie327645e74819aebd1260f5ce16b2ba46a674a7b Signed-off-by: Vincent Palatin <vpalatin@chromium.org> Signed-off-by: Alec Berg <alecaberg@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/201577 Reviewed-by: Todd Broch <tbroch@chromium.org>