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We are looking (again) at developing a DisplayPort 1.2 Input + USB 3.0 Input to USB-C (DFP) adapter. The CCG3 Host reference design is more or less the design we are looking at, but we had one key question:
If we want to allow Pin Assignment D (2 lanes DP and 2 lanes USB 3), will that work when a upstream laptop is connected via legacy DisplayPort 1.2 cable? Will that laptop get information via AUX that it should provide only 2 lanes DP? Since the laptop will not be part of the PD signalling regarding C or D pin assignment.
What we "fear" is that the laptop will always default to 4 lanes DP on the DP output and not be informed about the need to only deliver 2 lane DP on lane 0 and 1.
Since Cypress host reference design has a DP 1.2 input and it apperently works when connecting a laptop via a DP cable to it, maybe it is not a problem?