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When plugging in USB-C power with no battery (or cutoff battery), the ACOK signal from the ISL9238 charger sometimes has a negative pulse of up to 175 ms after VBUS increases from 5V to 20V. The width of the pulse varies from board to board. Increase CONFIG_EXTPOWER_DEBOUNCE_MS to 200 ms (from default of 30) to ignore this negative pulse. If we think we are running with no battery and no AC then we will set the charger voltage to 2.048V, and therefore lose power. BUG=b:77455171 BRANCH=none TEST=Plug power into Grunt with no battery. Change-Id: I9c0f358985e4c630daef93d61c49b87c2e11a480 Signed-off-by: Edward Hill <ecgh@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/1031563 Reviewed-by: Aseda Aboagye <aaboagye@chromium.org> Reviewed-by: Jett Rink <jettrink@chromium.org>
For an overview of the Embedded Controller firmware, refer to http://www.chromium.org/chromium-os/2014-firmware-summit For instructions on building from source, refer to http://www.chromium.org/chromium-os/ec-development/getting-started-building-ec-images-quickly