Aria V Display Port core sometimes disconnected

Hi,

It's not recommended to move example design to different AV dev kit board as this is not something Intel validated before and we can't guarantee it will work.

For MSA log review,

• I compared both the Quartus v15 and v20.1 example design MSA log
• in v15.0 MSA log :
  • everything is mess up. Link training is failing with high BER number
• in v20.1 MSA log :
  • Situation is improving likely thanks to bug fixed in older Quartus version.
  • DP link training is passing. (CR DONE = F, SYM DONE = F). BER number also zero now (good). Meaning DP data transfer is happening on your AV starter kit board which likely means your starter kit board is in good condition else link training will failed.
  • The only issue remaining is Rx MSA active video info is all zero. This looks to me your GPU/DP source is not transferring any active video to AV starter kit board for whatever reason. You may want to back your GPU source or try different GPU source. Don't use fancy USB to DP converter as you are adding additional complexity that may caused other issue. Pls stick with direct GPU card -> DP cable -> AV starter kit board connection

Below is my debug suggestion plan

1. Upgrade your custom DP design on your custom board from Quartus v15.0 to v20.1 standard

• This is to validate whether the Quartus bug fix help to resolve your original issue

1. Modify v20.1 DP example design to match with your custom board

• You tried this before using v15.0 DP example design but failed. I believed it's likely due to Quartus bug in v15.0 but should be fine now with v20.1 example design
  • The benefit is you can dump MSA log to validate the BER number that's questionable is the past in v15.9 design but now we have confirmed v20.1 design is output zero BER on AV starter kit board as long as the board design is good

1. 3rd option is to port over your custom DP design into AV starter kit board

• This is your debug plan but my advice is you at least need to bring up a working system setup on AV starter kit board before you port over your custom DP design
  • Before you do this, it's recommended to resolve the zero Rx MSA info issue first on why GPU/DP Tx is not transmitting active video to AV starter kit board
  • I am using the exact v20.1 example design sof file but it works on my Intel hardware setup. GPU = Nvidia GTX 1080 and I also tried both Philip and LG monitor.
  • Sometime if there is not video output on monitor, pls press cpu_resetn button on AV starter kit board to reset DP IP and restart link training again

Thanks.

Regards,

dlim