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Add checking the return value of enabling vbus in SRC_DISCONNECTED. If failed to enable vbus, don't transition to SRC_DISCOVERY. This can happen on zinger if zinger is in a fault condition, but once the fault is cleared, we need to be in SRC_DISCONNECTED in order to re-apply vbus. BUG=none BRANCH=none TEST=load onto EVT zinger. without this change, if zinger is plugged into a samus without a battery, when PD MCU is reset, zinger gets stuck in SRC_DISCOVERY with vbus disabled because pd_set_power_supply_ready() returns an error. This means to get power back to samus, we need to unplug and replug raiden. This change fixes the problem. Change-Id: I2ac75c7095b5d819b54b2f25ec974ccfd974e1e2 Signed-off-by: Alec Berg <alecaberg@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/216608 Reviewed-by: Vic Yang <victoryang@chromium.org> Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
For an overview of the Embedded Controller firmware, refer to http://www.chromium.org/chromium-os/2014-firmware-summit