Other Parts Discussed in Thread: TUSB1064, TPS65987,
I am trying to config the TPS65987 PD controller to be able to support a Samsung S9 and S20 in alt mode. I am paring the pd controller with the TUSB1064. The current config will work for both S9 and S20 in allowing the phone to charge, be a host of the usb network, and puts the phone into 4 lane display port. The problem is that i would like the S20 to go into 2 lane display port and have USB3 functionality. I am able to due this by setting the multifunction preferred bit in the Display port capabilities (0x51). when i set this bit though it will force the s9 to also try to go into the 2 lane displayport mode and i have confirmed with Samsung that the S9 has no support for that mode. In trying to switch to that mode then the s9 will not display through the display port. I do not have access to the S9 and S20 software to be able to put a service or app that would let a embedded microcontroller running as a usb peripheral (virtual com port) to toggle the setting once the S9 or the S20 is present. I have looked at all the registers in the PD controller and a USB hub (USB5807) to see if there is any register that would give me the indication that the a S9 or a S20 are present so that with that information i could toggle the bit. Samsung suggested that there must be a PD controller configuration that will automatically to the distinction and the setup for the 2 lane and 4 lane mode. I have used different docking station with the phones and verified that they do support this functionality that i describe above, i do not know what pd controller they use though.
Could you please advise?
