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TUSB8041: Wakeup from Suspendmode

SimonF
Expert 3390 points
Part Number: TUSB8041


Hi Team,

my customer is using the tusb8041USB hub. We detect a problem when disconnecting all USB devices from the downstream ports. The tusb8041 enters the USB suspend mode and our Linux operating system doesn't detect a device that is hot plugged to one of the tusb8041 downstream port.

We assume the tusb8041 is still in suspend mode. The question is how to configure the tusb8041 to enable a remote wakeup when connecting a slave device to the downstream port.

Best regards,

Simon

  • 0
    TI__Guru 60870 points

    Hi Simon,

    Does the hub fail to wake up if a USB 2.0 device is inserted?  Or just a USB 3.0 device?  The remote wake setups are a bit different for USB 2.0 vs. USB 3.0.  The Linux host controller does need to enable remote wake in the hub for a device connect or disconnect to wake the system. 

    Regards,

    JMMN

  • 0 in reply to JMMN
    TI__Expert 3390 points
    Hi JMMN,

    Yes, only USB1.1 and 2.0 devices are not detected. There is no problem with USB3.0 devices.

    I did a test with some (of the shelf) standard USB2.0 hubs. I connected them to our USB root port and there was no problem to connect USB2.0 devices to their downstream port. The USB2.0 devices were detected without any change in Linux software. So, it looks like a problem with the TUSB8041 configuration.

    Best regards,
    Simon
  • 0 in reply to SimonF
    TI__Guru 60870 points
    Hi Simon,

    That is very strange. Remote wake testing is something we do as part of our lab validation and as part of our USB compliance testing. Can you confirm if the driver is enabling remote wake on the USB 2.0 portion of the TUSB8041. Also, can you confirm that the ports are not marked as "non-removable"?

    Thanks,
    JMMN
  • 0 in reply to JMMN
    TI__Guru 60870 points
    Hi Simon,

    Any update on this issue?

    Regards,
    JMMN