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When EC sees discharge current hit BAT_MAX_DISCHG_CURRENT, we kick off a timer and ask AP to throttle. Then EC keeps monitoring discharge current. If the current doesn't drop below BAT_MAX_DISCHG_CURRENT - BAT_OCP_HYSTERESIS, we restart the timer and notify AP again, which shouldn't happen unless AP misses or ignores the first notification. When the timer expires, which means EC hasn't seen over-current for BAT_OCP_TIMEOUT_US, we ask AP to stop throttling. BUG=b:74321682, chromium:838754 BRANCH=scarlet TEST=manually test on scarlet, confirm EC sends EC_HOST_EVENT_THROTTLE_START and EC_HOST_EVENT_THROTTLE_STOP host events when entering/exiting OCP. Change-Id: I1e55fc23249596d8afec52a3885655ca9c1f2151 Signed-off-by: Philip Chen <philipchen@google.com> Reviewed-on: https://chromium-review.googlesource.com/994188 Commit-Ready: Philip Chen <philipchen@chromium.org> Tested-by: Philip Chen <philipchen@chromium.org> Reviewed-by: Daisuke Nojiri <dnojiri@chromium.org> Reviewed-by: Matthias Kaehlcke <mka@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