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On boot, if VBUS is present, then when PD protocol gets to SNK_DISCOVERY state, if it times out waiting for source cap, then send attempt to send a soft reset first instead of directly sending a hard reset. This allows us to not lose VBUS in the case that we were in a stable contract as a sink before this boot (for example a sysjump or EC reboot). BUG=chrome-os-partner:44085, chrome-os-partner:44952 BRANCH=none TEST=test on glados and samus. test by sysjumping between RO and RW with zinger plugged in and no battery, and verify that we don't lose power. also test rebooting with a battery and verify we don't lose power. also tested with a third party PD charger. Change-Id: Ib7ce46d8b9843db66805ba3237d8919d611324e0 Signed-off-by: Alec Berg <alecaberg@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/308201 Reviewed-by: Rong Chang <rongchang@chromium.org>
For an overview of the Embedded Controller firmware, refer to http://www.chromium.org/chromium-os/2014-firmware-summit