TDA4VM: Why is dp not outputting data after link train success？

Shaoyu Xu

Part Number: TDA4VM

Tool/software:

PSDK：07_01_00_45

Now the result of the link train of DP_LinkTraining-> fullTraining is OK, but the waveform cannot be measured with an oscilloscope.
Is there any way to debug why is there no data stream output now?

1 month ago

0 Brijesh Jadav 1 month ago

TI__Guru**** 476595 points

Hi,

if the link training is successful, there is no other change required.

One question, are you using SDK07.01? That's very old release, i think we did firmware upgrade in one of the later releases, so can you please use below link and update firmware and see if it helps?

[FAQ] PROCESSOR-SDK-J721E: eDP firmware responds wrongly to some messages and thus causes display incompatibility.

Regards,

Brijesh

0 Shaoyu Xu 1 month ago in reply to Brijesh Jadav

Intellectual 701 points

Hi Brijesh：

Upgrading the SDK is now more difficult for us.
As you said, there should theoretically be normal image output after successful link training. I wonder where the block is now?

Regards，

Shaoyu

0 Brijesh Jadav 1 month ago in reply to Shaoyu Xu

TI__Guru**** 476595 points

Hi Shaoyu,

This is not about SDK update, this is just about DP firmware update, so can you pls try updating DP firmware?

Regards,

Brijesh

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TDA4VM: Why is dp not outputting data after link train success？