Hi,
We use TPS65987D as Sink only, UFP_D Device.
The FW is below.
MANU-JIG03_fw_20200512.pjt
Our system performs power negotiation and DP negotiation in 3 steps.
i.e. 1st Power negotiation (5V/3A) => DP negotiation => 2nd Power negotiation (5V/3A and 12V/1.25A)
This is capture of PD negotiation.
TPS65987D send HPD-high attention message right after receiving Source cap.
After that, Host send soft reset, and TPS65987D accepted it.
I think Host sends soft reset message because TPS65987D violate PD spec.
According to PD spec, Power negotiation is not interruptible.
So, TPS65987D should send HPD-High attention after PS_READY(12V), or between DP_Configure and Source_cap(12V)
This situation occurs several times every 1000 times.
The below picture is PD log of desired situation.
Tthere is only about 5-10ms between DP_Configure and Source_cap(12V).
I think TPS65987D receives Source_cap while trying to send HPD-High, and TPS65987D looks like to fail to interrupt message transmission.
1. Please comment if this is a bug in TPS65987D.
2. Is it possible to avoid it by changing the FW?
Regards
