FS#2738 - [ramips] dwc2 no longer sees device with 0032-USB-dwc2-add-device_reset.patch #7895
Comments
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atliang: A quick bisect indicates that the last known working kernel with 0032-USB-dwc2-add-device_reset.patch applied is 4.4.208; however, after switching drivers/usb/dwc2/. to 4.5.0, the device_reset patch will make the device un-discoverable. |
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0x0aa: Confirmed. With the patch removed, USB works fine on 18.06, 19.07 and master. I recently acquired this little, obscure device "WS-WR512N1" (ramips) and flashed OpenWrt 19.07.3 on it. It worked well, but USB devices would not show up at all. I read a blog post from 2011 where the author of the port says that USB should work, so I tried older releases and sure enough, USB devices would appear on releases up to 17.01.x (kernel 4.4). I bisected and the breaking commit is [[https://git.openwrt.org/?p=openwrt/openwrt.git;a=commit;h=fddc78bc116bc043fb5cd92dbc45cfd054c21af8|ramips: bump to v4.9]]. The dwc2 driver has seen a lot of development between kernels [[https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/log/drivers/usb/dwc2?h=v4.4.74|4.4.74]] and [[https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/log/drivers/usb/dwc2?h=v4.9.34|4.9.34]] and if 0032-USB-dwc2-add-device_reset.patch is applied on these newer kernels, the driver will be broken. |
atliang:
Device: AXIMCom MR-102N
Last known working OpenWrt/LEDE release: lede-17.01
The DWC2 USB controller still probes according to dmesg output; however, the kernel no longer sees any USB device being plugged in.
Step to reproduce:
Workaround:
% dmesg
[ 5.250886] dwc2 101c0000.otg: Configuration mismatch. dr_mode forced to host
[ 5.302541] dwc2 101c0000.otg: DWC OTG Controller
[ 5.312342] dwc2 101c0000.otg: new USB bus registered, assigned bus number 1
[ 5.326774] dwc2 101c0000.otg: irq 26, io mem 0x101c0000
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