Cherry-picked onto the pinned SDK so the ONLY delta versus the pin is this
patch -- the xHCI controller-death investigation needs a controlled build.
The forward-port omitted the vendor driver's rv1106_usb2phy_tuning with the
note "the phy is functional without it". It is functional, but not reliable:
with these registers at reset defaults the HS link is electrically marginal
under sustained traffic, a bulk transfer eventually stalls, and the r8152
Tx-timeout recovery issues an xHCI Stop Endpoint command the controller never
answers. Measured carrier-on to death over four runs: 14s, 519s, 521s, 584s.
Refs flare-edge#160
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MVGTC78dgCGfRANNKjoPea
