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If override charge is selected on a port currently acting as a charge source, but the attached device is also capable of acting as a source, request a charge role swap and initiate a pending delayed port override. If the role swap completes successfully and a charge source is found, the selected port will become the override port. If the role swap fails or no charge source is found within 2 seconds, the delayed port override will be lost. BUG=chrome-os-partner:28343,chrome-os-partner:31195 TEST=Manual on Samus. Connect two Samus units together through charge ports. "pd 1 swap power" - put port on test device into source role "chgoverride 1" - set charge override, verify that role swap takes effect and charge manager selects PD charge source, 900mA @ 5V Disconnect charge cable, verify that charge manager goes back to not charging. BRANCH=Samus Change-Id: Iadcc4dc98631661f254245eeff18973df517f652 Signed-off-by: Shawn Nematbakhsh <shawnn@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/231900 Reviewed-by: Alec Berg <alecaberg@chromium.org>
For an overview of the Embedded Controller firmware, refer to http://www.chromium.org/chromium-os/2014-firmware-summit