Suspend and Resume traces

[Andy Green]

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Somebody in the thread at some point said:

| Things are starting to look way better with suspend/resume. I have a
| frew traces for you.

Good!  It's been stable with defconfig for many weeks but I know it
isn't for other configs.  Maybe we can backtrace our way to
understanding it.

| <4>[<c021fc7c>] (pcf50633_usb_curlim_set+0x0/0xdc) from [<c006caa0>]
| (__gta02_udc_vbus_draw+0x34/0x44)

Great thanks, this is the async notification that host PC has enumerated
us at 500mA power, it's randomly coming in before we resumed pcf50633...
that is definitely something that would make trouble with non-charging
GTA02 after suspend / resume.

The trace spew was all from the one event which tries to go on the bus
multiple times.  I never see this symptom here but this is definitely a
genuine issue for all configs to be fixed.

- -Andy
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