TPS65987D: Hot -plug issue

Patrick Chen

Part Number: TPS65987D
Other Parts Discussed in Thread: HD3SS460, , TPS65987

Hello

Customer use Gemini Lake and use HDMI dongle via type C connector to connect to Monitor with HDMI. If drop down type C cable for hot-plug, The display will show black screen. But if initial Gemini Lake from sleep mode to active mode. the display recovery and work normal.

Has any solution to solve this issue? Customer use TPS65987D and HD3SS460 on their board. Thank you.

Patrick

over 6 years ago

0 Eric Beljaars over 6 years ago

TI__Mastermind 36756 points

Hi Patrick,

I'm not sure I understand the issue. Are you able to reproduce this failure on the EVM? From your description, it sounds like the issue is related to Gemini Lake and not the PD controller. I would suggest working with Intel to resolve the Gemini Lake issue.

Thank you,
Eric

0 Patrick Chen over 6 years ago in reply to Eric Beljaars

Mastermind 8875 points

Hello Eric

if TPS65987 has any delay feature to delay DP signal to output to type c connector while hot plug type c connector? Thank you.

BR
Patrick

0 Eric Beljaars over 6 years ago in reply to Patrick Chen

TI__Mastermind 36756 points

Hi Patrick,

You could add a delay to HPD using the Event Delay register in the TPS65987D App Customization Tool.

If this answers your question, PLEASE select This resolved my issue

Thank you,
Eric

0 Patrick Chen over 6 years ago in reply to Eric Beljaars

Mastermind 8875 points

Hello

Per above issue. if hot-plug type C Hub, the monitor will display Black screen. But if reboot CPU, the display looks normal on monitor. Per normal and hot plug abnormal waveform as below. the HPD signal loos bounce while hot-plug type HUB. Customer tuning Event delay register but no any improvement.

Do you have any suggestion or have any de-bounce HPD signal feature on PD firmware to solve this hot plug issue? Thank you.

Patrick

0 Eric Beljaars over 6 years ago in reply to Patrick Chen

TI__Mastermind 36756 points

Hi Patrick,

Can you confirm which FW version you are using? Additionally, to test your theory of an HPD delay resolving the issue, you could connect the HDMI cable to the Type-C Hub later to emulate the delay as a test.

Thank you,
Eric

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TPS65987D: Hot -plug issue