POWER-FINAL-07 — charging performance (vendor charging policy on the 06 base)

Status: implementation complete and offline-qualified; physical NOT_RUN. The agent has not flashed. Readiness: MORE_WORK_REQUIRED. High-current operation is implemented but not enabled and not qualified.

Identity: Linux 551baad703b31c4fadfd0db96478481c0f5067bc (branch codex/platform-v1-power-final-07, from codex/platform-v1-power-final-06 tip bd7e54d), Reborn 97ff8c357bab12319087740d7c97b5051e6588f5 (unchanged), kernel 6.18.0-y2linux-platform-v1-power-final-07, root 2025.02.18-platform-v1.37, release 1.0.0-platform-v1-power-final-candidate.7, build Y2LINUX-PLATFORM-V1-POWER-FINAL-07. BOOTIMG 65a1daf484bb54cde14f6dd4906bd9b6b72872213a9409b2ea1fdc3fd38a3001, Y2ROOT 83a61c1e73c5fa34acc7d6e9af707ac0fd54d20e1226da2ae278846ff6d19e66. Fallback pair in fallback/ is the sealed 06 (currently installed).

SOURCE ANALYSIS

Vendor selector table (stock CS_VTH, 0xc07572f8, 16 words, units of 0.01 mA, index = CHR_CON4 field; identical order to BSP CS_VTH_PMIC[]): selector 0..15 = 1600, 1500, 1400, 1300, 1200, 1100, 1000, 900, 800, 700, 650, 550, 450, 300, 200, 70 mA. The owner-supplied mapping matched entry for entry. Programming: charging_set_current (0xc04cb934) floors the request with bmt_find_closest_level and writes the index; Linux uses the same floor rule.

Stock source policy (select_charging_curret, 0xc03a1d88; detection charging_get_charger_type, 0xc04cb2a8 stores only types 1, 3, 2, 5, 4): SDP 500 (PMIC 450), CDP 650, DCP 1100, nonstandard 1100, Apple 2.1 A 800, Apple 1.0 A 650 and 0.5 A 500 (consumed but never produced on this unit), unknown 70 mA. These differ from the reference cust_charging.h (AC 650, nonstandard 500), so they are product-specific.

Also verified from the stock/BSP code: BC1.1 flow (DCD, A1, A2, B2), pre-charge/CC at 3400 mV, CC/top-off at 4050 mV, recharge below 4110 mV, top-off timeout 10800 s, total 86400 s, charger watchdog service, charger_hv_detect thread, PMIC thermal trip ladder 50..120 C with 150 C critical, and battery_meter_get_charging_current (ISENSE-BATSNS over a sense-resistor constant). Differences kept on purpose: 4.175 V target with first-sample voltage termination instead of 4.2 V plus the 150 mA taper rule (POWER-02 overshot while waiting; no validated absolute current exists to run a taper rule).

CURRENT LIMITS

• SDP: stock 500 -> selector 12 (450 mA) once configured; 70 mA while unconfigured or before a data controller exists; 0 in reset/suspend; closest table step below any odd allowance. Never above 450 mA regardless of the owner ceiling.
• CDP: 650 mA (stock).
• DCP: stock 1100 mA, class ceiling 1100 mA, default result 650 mA (owner ceiling).
• Apple (2.1 A signature): stock 800 mA, default result 650 mA.
• Nonstandard: stock 1100 mA, class ceiling 70 mA (no defined capability, no validated VBUS-collapse check).
• Unknown: 70 mA. Deep discharge (at or below 3.4 V): at most 450 mA.

HIGHEST JUSTIFIED CURRENT

• Requested (stock, DCP/nonstandard): 1100 mA.
• Permitted by this build by default: 650 mA (hardware-exercised before). The owner ceiling can be raised, root-only, volatile, logged, to exactly 700/800/900/1000/1100 mA for qualification; 1200..1600 mA cannot be programmed.
• Hardware-qualified: 70, 450 and 650 mA selectors (earlier images). Nothing above 650 mA has run.
• Not yet qualified: 700..1100 mA, thermal derating on hardware, nonstandard-class charging, the charger-path current estimate.
• Limiting evidence: no cell charge rating (no label, datasheet or manufacturer value; stock model 1300 mAh and the reference header's 1728 mAh are compiled constants; web sources only show other Innioasis models at 1250-1500 mAh),

  no pack temperature sensor (stock reads a literal 25 C), no independent current measurement, and the PMIC die already reaches 43-47 C at 450 mA.

PMIC / BATTERY

One table (kernel/platform/charge-table.h); the write boundary (policy.h), the sequencer (charger-policy.h) and the reporting helper (power-math.h) all use it. The CHR_CON4 write mask stays 0xf; values 0..4 are refused by y2_pmic_value_allowed. Cell capacity and C-rate: not established; nothing in this build claims either.

CC/CV BEHAVIOUR

Unchanged: hardware CV at selector 30 (4.175 V), independent 4.2 V sample guard, first-sample termination, recharge at 4.11 V after six 10 s confirmations. The 0x8 fault is the 4.2 V sample guard (POWER-02 waited above the target; fixed earlier). The single 0x80 fault was y2_charge_protections() finding CHR_CON0 bit 0 (VCDT_HV_EN) clear (0x62) after about 38 min at 70 mA; the fail-closed inhibit worked, and what cleared the bit is not established. A current change always stops both engines, verifies, then re-programs and restarts through the hardware CSDAC ramp (no live current step). A high-current regression test covers CC -> hold -> full -> recharge at 1100 mA.

THERMAL PROTECTION

PMIC-die ladder at the stock trip points: 60 C 450 mA, 70 C 200 mA, 80 C 70 mA, 90 C pause (THERMAL_HOLD, health OVERHEAT, no fault), 5 C hysteresis; 150 C stays the latched fault. The die is not the cell: this is a protective heuristic, not a pack temperature. Live trend on the 06 image (USB SDP, 450 mA): die 36.9 C at boot to 46.9 C after 28 min, still rising. The charger is linear; sustained high-current wall charging is expected to engage the ladder.

USB COMPOSITE

Live read-only capture (out/deep-sleep-final/evidence/20261010/91-power07-charging-readonly/, 06 image): gadget y2 bound to musb-hdrc.4.auto, functions ecm.usb0 and ffs.mtp, UDC configured high-speed, MaxPower 500 mA / bmAttributes 0x80, usb0 10.42.0.1/24, MTP roots /data/music and /media/sd, /media/sd and /data mounted ext4. No USB gadget, MTP or storage code was changed in 07.

• MTP, USB Ethernet, SSH, internal eMMC, microSD, simultaneous data + charging after the 07 flash: NOT_RUN (procedure: tools/usb/qualify.py while charging on a PC port, then a wall-charger session without reboot).

PRODUCTION CLEANUP

Removed: three duplicate selector tables, the 70/450/650 allow-lists, y2_source_charge_ua/y2_charge_selector, and the mislabelled selected_charge_ceiling_ua observation key (now programmed_charge_ua and owner_charge_ceiling_ua). No debug sysfs, no polling added, no raw current interface; charging_state gained read-only fields. The owner ramp tool is a development helper and is not installed into the image. The broader production cleanup of the deep-sleep experiments remains scheduled after 06 qualification.

TESTS

• Locked-container production suite (tools/production/tests.sh): PASS, 598 cases (06: 581; +17 new), exit 0; 29 packaging-host and 27 native splash cases PASS.
• New: tests/test_charge_limits.py (11 C and source-scan cases: table equals the stock array, write boundary, exhaustive decision invariants over source x allowance x voltage x thermal level x ceiling, thermal ladder hysteresis, source switching PC -> wall -> PC -> CDP -> Apple -> nonstandard without reboot, thermal pause/resume, 1100 mA CC/CV, ISENSE offset hygiene) and tests/test_charge_qualify.py (6, the ramp tool always restores 650 mA).

  Mutation checks confirmed they fail when the nonstandard ceiling or the permitted-selector bound is broken.

• Three old assertions encoded the three-selector policy (test_power, test_power_policy, test_charger's 499.999 mA case) and were updated with comments; no failure was hidden.
• Host broad run: same 48 environmental errors as the 06 baseline, none new (660 vs 643 tests).
• Package validation, ELF closure (384 files / 1411 edges, no RPATHs), installed-ARM, release inventory, privacy (tree and root image): PASS. Kernel build: no warnings from the charger or policy objects; new strings present in the Image.
• Reborn unchanged; see validation/reborn-NOT-RERUN.md.
• Physical: NOT_RUN.

COMMITS

510b4e0 / fd43f14 audit, 0b76407 charger policy and tests, d254aab tools/docs, b47273b release identity, 551baad ISENSE offset hygiene (build commit), b78e037 docs (after the build).

OWNER ACTION

See OWNER-HANDOFF.md. Flash BOOTIMG + ANDROID only, tell me, I check identity and charger state read-only first.

FINAL VERDICT

IMPLEMENTATION_READY_HIGH_CURRENT_QUALIFICATION_PENDING