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e3cd6444aa
Implement the TCPC RX Detect register and use it for the TCPM to enable and disable PD communication. When no type-C connection, disable TCPC RX so that we don't send goodCRC when we are not ready. Once TCPM establishes a type-C connection, enable TCPC RX. BUG=none BRANCH=none TEST=tested on glados and on samus. On glados, without this change, sometimes when you plug in zinger, we get into a hard reset loop because TCPC is sending goodCRC to source cap while TCPM is still debouncing CC and is not ready. With this change, we reliably form PD contract. Also tested enabling and disabling PD comms from the TCPM console with "pd enable 0|1". Change-Id: I8c9e696f2597978436f6ceccfe06ffb021c95ea3 Signed-off-by: Alec Berg <alecaberg@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/274811 Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
For an overview of the Embedded Controller firmware, refer to http://www.chromium.org/chromium-os/2014-firmware-summit