Hi there Minas / linux-usb ;

I have a good ole APC Back-UPS ES 600N that from time to time resolves
that it should stop talking to my SBCs.

This issue happened in my Raspberry Pi, and when it stopped I had the
following printk:

Apr 11 14:10:15 localhost kernel: [9416331.806123] hid-generic
0003:051D:0002.000A: usb_submit_urb(ctrl) failed: -1

All I had to do is monitor the graphics and when it flatlined, unplug
and plug the UPS usb port. Until the next occurrence. Well, I lived
with it for some good years.

Last weekend I changed the Raspberry Pi with a TinkerBoard. And the
cranky UPS is also tickling TinkerBoard's USB port. Now the issue
manifests in a slightly different way:

[56529.462106] usb 1-1.1.3: new low-speed USB device number 9 using dwc2
[56530.222538] usb 1-1.1.3: New USB device found, idVendor=051d, idProduct=0002
[56530.222638] usb 1-1.1.3: New USB device strings: Mfr=3, Product=1,
[56530.222697] usb 1-1.1.3: Product: Back-UPS ES 600N FW:876.Q1j.D USB FW:Q1j
[56530.222772] usb 1-1.1.3: Manufacturer: APC
[56530.222821] usb 1-1.1.3: SerialNumber: 5B1017T20483
[56535.075030] hid-generic 0003:051D:0002.0003: hiddev0,hidraw1: USB
HID v1.10 Device [APC Back-UPS ES 600N FW:876.Q1j.D USB FW:Q1j] on

[105243.156331] dwc2 ff540000.usb: dwc2_hc_chhltd_intr_dma: Channel 11
- ChHltd set, but reason is unknown
[105243.156414] dwc2 ff540000.usb: hcint 0x00000002, intsts 0x06600029
[105273.536188] dwc2 ff540000.usb: dwc2_hc_chhltd_intr_dma: Channel 13
- ChHltd set, but reason is unknown
[105273.536268] dwc2 ff540000.usb: hcint 0x00000002, intsts 0x06600029

Well, in spirit to getting things going nicely in the new system, I
have found the thread:

Where Minas suggests a patch to tackle it.

I tried to backport the patch to my 4.4 Kernel and it was not really
happy about it:

  CC      drivers/usb/dwc2/hcd.o
drivers/usb/dwc2/hcd.c: In function ‘dwc2_core_init’:
drivers/usb/dwc2/hcd.c:2191:22: error: ‘trdtrim’ undeclared (first use
in this function); did you mean ‘strstrip’?
  u32 usbcfg, otgctl; trdtrim;
drivers/usb/dwc2/hcd.c:2191:22: note: each undeclared identifier is
reported only once for each function it appears in
drivers/usb/dwc2/hcd.c:2192:2: warning: ISO C90 forbids mixed
declarations and code [-Wdeclaration-after-statement]
error, forbidden warning: hcd.c:2192
scripts/Makefile.build:277: recipe for target 'drivers/usb/dwc2/hcd.o' failed
make[3]: *** [drivers/usb/dwc2/hcd.o] Error 1
scripts/Makefile.build:484: recipe for target 'drivers/usb/dwc2' failed
make[2]: *** [drivers/usb/dwc2] Error 2
scripts/Makefile.build:484: recipe for target 'drivers/usb' failed
make[1]: *** [drivers/usb] Error 2
Makefile:1016: recipe for target 'drivers' failed
make: *** [drivers] Error 2


Patchset: https://pastebin.com/v1ink6fJ

1. What are the odds that the OP patchset will also help my issue?
2. IF 1 == true ; then what am I doing wrong in my patch? :-)

Appreciate your time.
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