Hi, While I dug deeper in the HNP process with EHCI host, I found there is a conflict. The OTG spec defines that, in HNP, default-a device always supplies the vbus power even in peripheral mode. And thus default-b device will work in host mode with port power off. Here is the problem, if I don't set the PP(Port Power) bit in PORTSC register of EHCI(Linux ehci stack automatically sets it, but we can by-pass it), the port will not working according to the EHCI spec. Otherwise, if I set the PP bit, the b_host will drive vbus which violates the OTG spec. Does anyone have an idea on how to get around this?
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