Hello TI,
Our motherboard + expansion board which use the DP130 somehow uses HBR instead of HBR2.
Our GPU is capable of HBR2 and we're able to confirm that the sink we use for testing supports HBR2 as well. The sink is not using any redriver.
The motherboard uses the DP130 on one port and connects to an expansion board that also uses the DP130.
It seems like the redriver is causing the lowering of the link rate because on the same motherboard without the redriver, the DisplayPort can successfully use HBR2 during link training.
Is there any setting that needs to be changed in order for the HBR2 to be selected during link training? (This is provided that cables, sink, and source support HBR2).
Or is cascading 2 DP130's causing the problem? (Reference here: https://e2e.ti.com/support/interface/f/138/t/556372?tisearch=e2e-sitesearch&keymatch=sn75dp130%2520dpcd )
We are using the DP130's as source + expansion (not as sink). The sink connects through the expansion.
Looking forward to your response.
Thank you very much.