Hi, On 1/8/2020 2:29 PM, H. Nikolaus Schaller wrote: > Hi, > I noticed that the usb ethernet gadget driver is broken since v5.5-rc2 > and 5.4.4, but only for our OMAP5 board. Our OMAP3 boards work with > the same tree, kernel binary and user-space (Debian Stretch). > > The symptom is that I can see the interface on the host PC being > enumerated and IP addresses etc. are set up. But a ping in either > direction fails/times out. > > After inspecting diffs I found some changes in dwc3:gadget > and indeed omap3/twl4030 uses musb and omap5 uses dwc3. > > Reverting > > a7f7e61270f1 ("usb: dwc3: gadget: Fix logical condition"); > > on v5.5-rc makes it work again. > > BTW: v4.19.90 works although it includes this logical condition fix. > So the real difference between v4.19 and v5.5 may be elsewhere in > newer kernels and only be revealed by the patch. > > If important: my setup is running with USB2 cable and speed > only. > > So please check this and other recent dwc3 patches for introducing > a stall of communication. > Another gadget driver issue was reported by Thinh after my fix, and he has submitted a patch for the same. You can refer the discussion https://patchwork.kernel.org/patch/11292087/. Can you check if that patch works for you ? > BR and thanks, > Nikolaus Schaller > > Thanks & Regards, Tejas Joglekar