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USB Billboard class can be used to advertise an alternate mode capable device that hasn't entered a mode. Additionally it can remain after mode entry providing its Billboard capabilities descriptor is updated. This CL postpones enumeration which previously occurred after boot until tAMETimeout has passed and alternate mode has NOT been entered. Future CL could choose to also (re)enumerate with mode capabilities although this is not required by the USB PD specification. BRANCH=none BUG=chrome-os-partner:31192,chrome-os-partner:31193 TEST=manual, With DFP_U which does not enter mode see Billboard class enumerate else it does not. Change-Id: I59a0815cd0ea551ba9a878907c0184df4ba9480c Signed-off-by: Todd Broch <tbroch@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/224663 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