Re: dwc3 gadget breaks on system suspend/resume

[Roger Quadros <rogerq-l0cyMroinI0@public.gmane.org>]

On 19/01/17 13:59, Felipe Balbi wrote:
> 
> Hi,
> 
> Roger Quadros <rogerq-l0cyMroinI0@public.gmane.org> writes:
>> Hi Felipe,
>>
>> We have system suspend resume working on dra7-evm in v4.10-rc but
>> dwc3 gadget breaks after system suspend resume.
>>
>> Any hints how to fix it? Full backtrace below.
> 
> from a quick look. END_TRANSFER is timing out, most likely. Tracepoints
> should give better hints.
> 
> We might have a bug in dwc3_gadget_suspend(). No idea what's really
> going on.
> 
>> Another message that looks worry-some is
>> "[   61.495313] omap-dwc3 48880000.omap_dwc3_1: runtime PM trying to suspend device but active child"
> 
> did you implement runtime PM on dwc3-omap.c? Look at dwc3-pci.c for reference.
> 
>> If I unload gadget, then suspend/resume system then load gadget everything works fine.
> 
> right, dwc3 UDC will already have been toredown. Unfortunately I can't
> spend a lot of time on this, so you're gonna have to try to fix it and
> provide a patch :-s Quite busy looking at some f_fs weirdness.

No problem. I'll debug this issue.

cheers,
-roger
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