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dwc3: improve debugging

Authored by bz on Jul 2 2022, 9:15 PM.



Rather than hiding behind #if 0, hide the debugging behind DWC3_DEBUG
so it can be turned on with a single define. Require bootverbose
to print anything so we can still avoid spamming the console if DWC3_DEBUG
is on.
Harmonize the format string in snsp_dwc3_dump_regs() to always print the
full register and also print the XHCI quirks.
Call snsp_dwc3_dump_regs() twice, before and after generic XHCI attachment
and initialisation as this may have an effect on the confirgumation state.

MFC after: 2 weeks
Obtained from: an old debug patch

Test Plan

Extracted from D35484 as requested by @mw.

Diff Detail

rG FreeBSD src repository
Lint Not Applicable
Tests Not Applicable