1. Post-jump drift bootstrap: on the first Sync packet following a step
jump, do not compute frequency drift against a synthesized zero delta,
which previously caused the entire residual phase offset (~ms) to be
mistaken for frequency drift (~million ppb) and immediately absorbed.
2. Drift rate formula: normalize the adjustment contribution by the actual
measurement interval instead of the adjtime slew period, and compute
natural delta rate as (delta - last_delta + last_adjtime) / interval.
3. Remove broken last_delta > delta comparison that prevented offsets from
converging and applied inverted corrections on negative overshoots.
4. Correct ptp_adjtime() invocation to always pass adjustment_ns for
CLOCK_REALTIME slewing rather than dropping drift compensation when
delta exceeds threshold. Clamp adjustment_ns to the hardware slew limit
so last_adjtime_ns accurately mirrors the true slew applied.
5. Enable Delay_Req in E2E mode once clock is tracking (not jumping) and
allow software timestamping latency in ptp_process_delay_resp().
6. Propagate initialization return code from ptpd_start() and avoid
unconditional failure print in do_ptpd_start().
Assisted-by: Claude:claude-sonnet-5
Assisted-by: Gemini:gemini-3.8-flash-medium
Signed-off-by: Daniel P. Carvalho <danieloak@gmail.com>
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