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When a PD charger is detected, gets its max charge capability, but initially negotiate for its minimum charge mode. If we later determine that the port will be the one active charge port, re-negotiate for the max charge capability. BUG=chrome-os-partner:32003 TEST=Manual on Samus. Plug in Zinger, verify that current limit is initially set to 500 mA, then switches to 3000 mA shortly after. Plug in two Zingers, verify that one provides 3000 mA current while the other negotiates to 500 mA. Verify that the 500 mA charger bumps up to a high current once becoming active. BRANCH=Samus Change-Id: Ifa562b72d763642fc8bd62bc7f5aaa4eda1ef950 Signed-off-by: Shawn Nematbakhsh <shawnn@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/225922 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