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Original question:

TUSB4041I: TUSB4041 OTP Tool

TUSB4041I: Linux connect to 4041 successful,but device do not

xiaoyan Chi
Expert 1395 points
Part Number: TUSB4041I
Other Parts Discussed in Thread: TUSB4041PAPEVM

Hi,

    We using tusb4041 with arm Linux. Sch and BOM reference with tusb4041papevm.

    We got kernel log:

    [ 14.212241] usb 1-1: new high-speed USB device number 5 using ambarella-ehci
    [ 14.348079] usb 1-1: New USB device found, idVendor=0451, idProduct=8142, bcdDevice= 1.00
    [ 14.356247] usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=1
    [ 14.363371] usb 1-1: SerialNumber: 29050841A7A1
    [ 14.368453] hub 1-1:1.0: USB hub found
    [ 14.372326] hub 1-1:1.0: 4 ports detected

    It looks like linux has successfully connect to 4041 .But if we add a usb device such as flash disk,there is nothing connectted.

   We capture the waves of upstream D+ and D-:

    

  

  • 0
    TI__Guru 60870 points

    Hello Xiaoyan,

    It looks like there is a lot of USB resets occurring.  Are you seeing anything in the log?  Can you use USBMON to get more verbose USB?

    Can you check the downstream DP/DM lines?

    Regards,

    JMMN

  • 0 in reply to JMMN
    Expert 1395 points

    Hi,

    Thanks for reply.There's nothing print on log.I will try to install usbmon.

    Downstream DP is hang on 3.3v and DM is 0.

  • 0 in reply to xiaoyan Chi
    TI__Guru 60870 points

    Ok, if downstream DP is 3.3V and DM is 0V, the devices are enabling their pullups but the hub / host is not responding.  Debug statements would be helpful.  Also check that the OVERCURz input is not getting set on any port.

    Regards,

    JMMN

  • 0 in reply to JMMN
    Expert 1395 points

    Hi,I've got usb log with tcpdump usbmon.1_0 is flash disk insrted.1_1 is hub only.

    I don't know why I can't upload pcap file .So I change it to .txt . You should change it back to .pcap .

    Fullscreen usbmon1_0.txt Download 
    �ò��8�g@@9
����S�<8�g�����8�gDD9
����C�-8�g8h@@�,����S�-<8h����8.h@@9
����S�<8.h�����88hDD9
����C�-88h8Ah@@9
����S8Ah����#8Jh@@9
����C->8Jh8BiAA�,����C�-8Bi8Ji@@�,����S�-<8Ji����8��AA�,����C�-8��8��@@�,����S�-<8������8s	@@9
����S�<8s	�����8�	DD9
����C�-8�	8_4AA�,����C�-8_48e4@@�,����S�-<8e4����8I8@@9
����S8I8����#8T8@@9
����C->8T88_8@@9
����S�	<8_8�����8�8BB9
����C�	-8�88�8@@9
����S	8�8����819@@9
����C	->8198G9@@9
����S�<8G9�����8S9DD9
����C�-8S98g9@@9
����S�	<8g9�����8�9DD9
����C�	-8�98�9@@9
����S�	<8�9�����8,:DD9
����C�	-8,:8::@@9
����S�	<8::�����8�:DD9
����C�	-8�:8�:@@9
����S�	<8�:�����8&;DD9
����C�	-8&;83;@@<����S�	-<83;����8f;@@9
����S�	<8f;����(�(8�;RR9
����C�	-8�;	@QB�8"D@@<����C�	-8"D����84D@@9
����S	84D����8kD@@9
����C	->8kD8zD@@9
����S8zD����#8�D@@9
����C->8�D8�r@@�,����C�-8�r����8<�@@:
����S�<8<������8G�DD:
����C�-8G�8O�@@�,����S�-<8O�����8r�@@:
����S�<8r�����(�(8|�RR:
����C�-8|�	@k8��@@�,����C�-8������

    usbmon1_1.txt

  • 0 in reply to xiaoyan Chi
    TI__Guru 60870 points

    Hi Xiaoyan,

    Reviewing the log, the host keeps cycling through suspending and resuming the hub, but I don't see any reason for that behavior.  It is normal for the host to suspend a hub with no downstream devices and then wake when a device is inserted, but in this case the host just reads the port status and suspends the hub.  Can you try booting the system with a device connected to a hub downstream port?

    Regards,

    JMMN

  • 0 in reply to JMMN
    Expert 1395 points

    Hi,Blow is system booting with device inserted :

    usbmon1_2.txt

  • 0 in reply to xiaoyan Chi
    TI__Guru 60870 points

    Very strange, I'm seeing the exact same behavior in this trace.  Have you checked the overcurrent inputs to the hub to see if they are accidentally being flagged?

    Regards,

    JMMN