Hello King,
Please kindly refer my comments as below:
1. If I can config CYPD 3120 just by EZ-PD configuration utility, or I need rebuild the firmware w/ config.c file?
>>You can config CYPD 3120 just by EZ-PD configuration utility to change the pin assignment support. There is no need re-build firmware.
2.if the main link channel will effect the EDID transmission ？
>>The main link channel will not effect the EDID transmission, since EDID is negotation via AUX Channel.
3. pin-assignment C/D/E，Is it corresponding DP modes supported in EZ-PD configuration utility?
>> Your understand is correct.
4. Could you tell me how to do it without an analyzer?
>> You need an analyzer, you could take a look CY4500 from IFX, https://www.cypress.com/documentation/development-kitsboards/cy4500-ez-pd-protocol-analyzer
5. Do you mean out of data, because of PU/PD resistor? Currently, my sink is eDP LCD panel. I have checked the eDP spec. which say noneed PU/PD resistor of AUX_P/N.
>> Not equals to. The EDID have includes the resolution of DisplayPort, the configuration of DisplayPort, it shall be match the true project. If the LCD panel will not change dynamically, the EDID shall correct.
Best Regards,
Lisa
