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SubjectRe: suspend problem with dwc3 gadget / g_multi when usb disconnected


Martin Kepplinger <> writes:
> I'm running today's linux-next with this defconfig on a librem 5 devkit:
> So I want to have host and gadget mode (G_MULTI, most importantly a
> serial ACM console), and I'm having trouble with S3 suspend:
> * The most interesting case here: When I boot with USB disconnected
> (from the battery) I can't suspend or unload dwc3. After "echo mem >
> /sys/power/state" I get nothing in the my logs except
> [ 18.107380] PM: suspend entry (deep)
> and the system hangs. similarly, I can't work around this by rmmod -f
> dwc3. What can go wrong here? I don't know enough about usb hci and why
> this shouldn't work. What can I do to help you here?
> * When I boot with USB connected, then unplug USB, I get:
> [ 19.289602] dwc3 38100000.usb: request 000000006a19695c was not
> queued to ep3in

please capture ftrace logs from dwc3. We have documentation for this:

(note to self: update email address :-)

> and then try to suspend:
> root@pureos:/home/purism# echo mem > /sys/power/state
> [ 37.863066] xhci-hcd xHCI host controller not
> responding, assume dead
> [ 37.871345] xhci-hcd HC died; cleaning up
> [ 37.877260] PM: dpm_run_callback(): platform_pm_suspend+0x0/0x78
> returns -22
> [ 37.884626] PM: Device failed to suspend async: error -22
> [ 37.891728] PM: Some devices failed to suspend, or early wake event
> detected
> bash: echo: write error: Invalid argument
> * When I keep USB connected, the behaviour is similar actually, but
> rmmod works (but that use-case is not that interesting to me).
> Since my experience with USB drivers is limited, I'm glad to hear about
> any of your experience with dwc3- or more general gadget-problems with
> suspend and that or a similar configuration.
> Without G_MULTI and dwc3 host-only, suspend works btw. And all the above
> is basically identical on previous stable kernels too.

Have you tried any other gadget drivers or just g-multi? Care to try
with something simple like g-zero?


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