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We found a potential risk that voltage might fed back into EC Vcore. If the CC pin voltage detector is enabled and there is an unexpected voltage source over 3.3v fed back into EC, this might cause an exception or unknown reset. BRANCH=none BUG=none TEST=The voltage detector is enabled after vconn is offed. Change-Id: I78975fa195eef0b96056a39ee3c6d92c3bb6f8c0 Signed-off-by: Dino Li <Dino.Li@ite.com.tw> Reviewed-on: https://chromium-review.googlesource.com/647673 Reviewed-by: Randall Spangler <rspangler@chromium.org>