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  • TI Thinks Resolved

TPS65987D: Samsung S9/S10 does not get video out.

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Replies: 10

Views: 202

Part Number: TPS65987D

Hello everyone again.

I am working on video sink and power solution for USB Type-C using TPS65987D.
I did get everything working with Chromebook from CTI. 
However, for some reason only power works with Samsung S9 or S10 smartphones.
I did search this forum and found one of treads that talks about no video from S8; however, 
in Samsung documentation it says that these smartphones support DisplayPort over USB-C.
Is there anything special needs to be set Samsung to start outputting video on USB-C, and if it is, what is it?

Thanks.

  • Hello Aleksey,

    Do you have a PD analyzer and can capture the PD logs being sent by the two devices? If you do not have one, I highly recommend investing in one. We typically recommend the PD Analyzer manufactured by Total Phase. For problems like this where it is most likely an issue occurring through the negotiation process, it is difficult to debug without looking at the PD logs.

    Another thing you can try in the meantime is to play with the DP pin assignments/configuration within the GUI. Can read the following application note to help explain the DP alternate mode.

    Regards,

    Adam McGaffin

  • In reply to Adam Mc Gaffin:

    Hello Aleksey,

    I have not seen a reply from you on this topic, so I will assume that the above post helped and can consider this item closed.

    Regards,

    Adam McGaffin

  • In reply to Adam Mc Gaffin:

    Hello Adam.

    It is being while, but issue still exist.
    We did investigate every possible different settings in Display Port configuration register 0x51.
    Unfortunately, nothing works.

    We did get a PD analyzer, and in the protocol of communication TPS65978D and Samsung S10e nothing says about DisplayPort.
    Here is the file with the capture of communication;
    SamsungS10eLog.xlsx

     Is there any more suggestion?

    Thanks

  • In reply to Aleksey Starovoytov:

    Hello Aleksey,

    For your application, the TPS65987DEVM is setup as the UFP with the Samsung phone setup as the DFP. The DP alternate mode process starts with the DFP sending a discover identity message to the UFP. Since the Samsung phone never sends this command, we are unable to enter into the alternate mode. The following capture is from the "PD Alternate Mode: DisplayPort" app note I originally shared.

     

    Regards,

    Adam McGaffin

  • In reply to Adam Mc Gaffin:

    Thank you Adam.


  • In reply to Aleksey Starovoytov:

    Hi Adam,

    Here is the protocol of communication between Samsung phone and off shelf USB-C to HDMI cable;

    SamsungCable.xlsx

    For some reason, right after negotiation of power the phone sends initiator message, but it is not doing it with our device based on TPS65987D.
    Can you check it and tell if we need to do anything different?

    Thank you

  • In reply to Aleksey Starovoytov:

    Adam,

    In your last post you said that there is no Discover Identity message, but to me it looks like we have such a message here.

    After this message the phone ask's for more power only. Here, Product Type of our device is Peripheral, while the converter cable Product Type it is not a Peripheral but Alt mode adapter, and then DP discovery starts.
    I feel this is the main issue; however, I cannot find a way of changing Product Type in Application Customization Tool.

    Regards

    Aleksey

  • In reply to Aleksey Starovoytov:

    Hello,

    Could you share with me the full PD log? Cannot read into each message with only the excel export.

    Regards,

    Adam McGaffin

  • In reply to Adam Mc Gaffin:

    Hi Adam,

    I did started another forum thread because TI thinks this issue is resolved.
    http://e2e.ti.com/support/interface/f/138/p/825152/3061061#3061061

    Aleksey

  • In reply to Aleksey Starovoytov:

    Hi Aleksey,

    Thanks for letting me know. I'll go ahead and close this thread then and work with Hari to resolve it within the other thread.

    Regards,

    Adam McGaffin

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