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2bd7dce32e
Add support for two new configs to specify critical energy battery percentage and critical external charger power. When we are under both thresholds, set the LIMIT_POWER charger parameter to inform the AP that it should conserve power to avoid brownout, and consider jumping to EC RW to negotiate PD. In addition, modify the existing CONFIG_CHARGER_MIN_BAT_PCT_FOR_POWER_ON to allow power-up regardless of power level if a 15W+ charger is attached, since there is a reasonable chance it may speak PD and provide sufficient power to boot the AP. BUG=chromium:537269 TEST=Manual on Glados. Set CHG_MW thresh to 20000, BAT_PCT to 50. Verify that LIMIT_POWER charger param is set until Zinger negotiates to 20V. Also veify that system can boot with Donette. BRANCH=None Signed-off-by: Shawn Nematbakhsh <shawnn@chromium.org> Change-Id: Ic963c82fea4ad10e8a5d7e476c5ce3e5ae525dad Reviewed-on: https://chromium-review.googlesource.com/306774 Commit-Ready: Shawn N <shawnn@chromium.org> Tested-by: Shawn N <shawnn@chromium.org> Reviewed-by: Randall Spangler <rspangler@chromium.org> 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