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In order to pulse RTC reset to the PCH when power sequencing exit fails we need to watch for SLP_S4 to deassert and if it does not then assert RTCRST using a board specific method. This is attempted up to 5 times before giving up and staying in G3. On skylake the RSMRST passthru needs to be honored when the task is woken up, so while waiting call handle_rsmrst() if woken up early. This is needed because it is RSMRST that actually tells the PCH to try and wake. This is all wrapped in a config option and board specific method because not all boards have a GPIO to control RTCRST and if they do they may not all use the same method to assert it. BUG=chrome-os-partner:49564 BRANCH=glados TEST=manually tested on chell EVT: First, ensure board sequences properly if everything is OK for a normal boot. Next, modify handle_rsmrst() to not pass through the signal in order to simulate being stuck in S5, and ensure that the EC attempts to assert RTCRST and power up again 5 times before giving up and staying in G3. Change-Id: Ia3c13069c92762b51beb682a19e5a074194a3c26 Signed-off-by: Duncan Laurie <dlaurie@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/322724 Reviewed-by: Shawn N <shawnn@chromium.org>