Ethernet gadget disconnect on Altera SoCKit

Hello,

I've been able to get USB OTG running on my Altera SoCKit board (from Terasic), running Linux 3.18.20.

It runs fine for a while - I'm able to make an SSH connection and do some interaction via the terminal, but after a couple of minutes of operation I get:

[ 41.784199] dwc2 ffb40000.usb: s3c_hsotg_ep_sethalt(ep eec1d05c ep1in, 0)

[ 41.794121] dwc2 ffb40000.usb: s3c_hsotg_ep_sethalt(ep eec1d0b8 ep2out, 0)

[ 41.803367] dwc2 ffb40000.usb: s3c_hsotg_ep_sethalt(ep eec1d114 ep3in, 0)

[ 41.821712] dwc2 ffb40000.usb: s3c_hsotg_ep_sethalt(ep eec1d05c ep1in, 0)

[ 41.830937] dwc2 ffb40000.usb: s3c_hsotg_ep_sethalt(ep eec1d0b8 ep2out, 0)

[ 41.840043] dwc2 ffb40000.usb: s3c_hsotg_ep_sethalt(ep eec1d114 ep3in, 0)

[ 41.857789] dwc2 ffb40000.usb: s3c_hsotg_ep_sethalt(ep eec1d05c ep1in, 0)

[ 41.866859] dwc2 ffb40000.usb: s3c_hsotg_ep_sethalt(ep eec1d0b8 ep2out, 0)

[ 41.875958] dwc2 ffb40000.usb: s3c_hsotg_ep_sethalt(ep eec1d114 ep3in, 0)

[ 41.893237] dwc2 ffb40000.usb: s3c_hsotg_ep_sethalt(ep eec1d05c ep1in, 0)

[ 41.902237] dwc2 ffb40000.usb: s3c_hsotg_ep_sethalt(ep eec1d0b8 ep2out, 0)

[ 41.911193] dwc2 ffb40000.usb: s3c_hsotg_ep_sethalt(ep eec1d114 ep3in, 0)

and the terminal dies. Attempts to re-establish an SSH connection are rejected. If I leave the board up and running, I get occasional messages spit out to the USB-UART port:

[ 2683.940759] dwc2 ffb40000.usb: ep0: failed to become enabled (DXEPCTL=0x00008000)?

[ 2684.208756] dwc2 ffb40000.usb: ep0: failed to become enabled (DXEPCTL=0x00008000)?

[ 2684.272758] dwc2 ffb40000.usb: ep0: failed to become enabled (DXEPCTL=0x00008000)?

Can anybody advise what I could do to fix?

Thanks,

--George Broz

Moog Industrial Group