POWER-FINAL-42 — reopen the SMI gates before a software restart

Status: SEALED, awaiting the owner flash (2026-10-16). Package out/y2linux-platform-v1-power-final-candidate-42/ (fallback = 41), receipts out/deep-sleep-final/build42-receipts/. BOOTIMG 6eb3209b2f8b56a0c1f810d9379769928a3f7f9f63bbdc118bcda3e888527ff3, Y2ROOT 25252bba7ee8c4ccdab44cb721fb70f1678c52c75402272a8952ae3447ad918b, RECOVERY 5a5725dc73e20bbb228814bfb95a184cd4ae2b0be45ca1a478ed8906ff9443e7. Kernel 6.18.56-y2linux-platform-v1-power-final-42, release …candidate.42, update sequence 4200. Container suite 718 OK, all seal checks PASS. Signed OTA (release key): …-42-ota-release/.

Why

41 confirmed that a software restart leaves the SMI common gate closed (archive 20261016/142), but opening it at the next handover is too late: LK's request issued while the clock was off stays stuck in larb0. 42 adds a restart handler (priority 255, before the watchdog handler, after all drivers have shut down) in mm-clocks.c that reopens SMI common and larb0 (MMSYS_CG_CLR0 = 3) when the DIS domain is powered, so LK starts from the cold-start state. 41's handover opener and the snapshots stay.

Device results

First boot after the flash dark with larb0 idle (archive 20261016/143, stale state after the stuck 41 restart and
the flash); the next cold start was healthy.
Restart still dark (archive 144), also with dis_pdn off (145): SMI gates 1 left closed at handover again.
The gate is closed during the next boot (Lima runtime idle), not left over. Fix: 43.

Owner steps

Flash 42 (BOOTIMG + ANDROID).
With the owner's OK: one software restart. Expected: panel lit, larb0 idle at handover, no SMI gates line.
Then /data/updates/restart.json {"mode": "reboot"} and an install with no Power presses.