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1.ANX3429 have CC Rx buffer, when the partner sent one message,ANX3429 received this message into Rx buffer and triggered an interrupt to inform (TCPM), at this moment Reef sends a CC message before reading CC Rx buffer. After Reef sends this CC message successfully, it receives the message the partner sent. So (TCPM) sees an unexpected message was received, that`s why sends out hard reset. Root cause: ANX3429 use a normal R/W register as a interrupt status register. Between EC read interrupt status and clear interrupt status, if ANX3429 change interrupt status, it causes interrupt status is incorrect on EC side. Solution: ANX3429 FW use two normal R/W registers for interrupt status reg, one is for FW interrupt status,other is for EC control register. Note: Since cc messages conflict between TCPM and the Partner,ANX3429 shall discard the TCPM message, (TCPM) sometimes send soft reset depend on the discarded message type. 2. Sometimes TCPM (Reef) does not response GoodCRC for a received mesg. Root Cause: Reef send message conflict with ANX3429 send auto GoodCRC. Solution: This is fixed in the 1.5 ANX 3429 firmware. BUG=chrome-os-partner:53936 BRANCH=none TEST=On Reef tested with ANX3429 FW v1.5, did not see HARD RST on ec log with Zinger. Change-Id: I81da95433e7a0cc71e7ed121b925afccbcd84b06 Signed-off-by: Swang <swang@analogixsemi.com> Signed-off-by: Divya Sasidharan <divya.s.sasidharan@intel.com> Reviewed-on: https://chromium-review.googlesource.com/381014 Commit-Ready: Kevin K Wong <kevin.k.wong@intel.com> Tested-by: Kevin K Wong <kevin.k.wong@intel.com> Reviewed-by: Kevin K Wong <kevin.k.wong@intel.com> Reviewed-by: Shawn N <shawnn@chromium.org>