POWER-FINAL-43 — hold SMI for LK's display until the display takes over

Status: SEALED, awaiting the owner flash (2026-10-16). Package out/y2linux-platform-v1-power-final-candidate-43/ (fallback = 42), receipts out/deep-sleep-final/build43-receipts/. BOOTIMG bf5739dece268ce2b76cef7a66993af4348bb0d81729f19c5f261b63ba881ddc, Y2ROOT d18c1f06b774027f6e3addb7479058a2df533c4c8357beb345fed2c5ab350641, RECOVERY 54e7eab49e4ab4fb1d8302f80a5474d2974cd919fc935256a827dbed98c3b61d. Kernel 6.18.56-y2linux-platform-v1-power-final-43, release …candidate.43, update sequence 4300. Container suite 718 OK, all seal checks PASS. Signed OTA (release key): …-43-ota-release/.

Why

42 (reopen the gates before the restart) did not help (archives 20261016/144, and 145 with dis_pdn off): the gate is closed during the next boot, not left over. Lima shares SMI common and goes runtime idle 200 ms after its probe. Every lit cold start hands the display over ~0.10 s after Lima's probe; every dark restart (38–42, screen on or off) ~0.5 s after it (archives 135–145). Then the last reference drops, CCF closes SMI common under LK's running fetch and larb0 wedges. The owner observed the same with power-on from charging with USB plugged in, which also hands over late.

Change	Detail
`mm-clocks.c`	Holds SMI common and larb0 from probe when LK left them running (`holding SMI common/larb0 for the loader display …`); `y2_mm_release_loader_hold()` drops the hold.
mutex (patch 0011)	Releases the hold in the first prepare, after enabling its own references.
42's restart handler	Removed. 41's handover opener and the snapshots stay.

Device results — FIXED

Cold start (archive 20261016/146): hold taken at 0.40 s (before Lima at 0.41 s) and handed to the display mutex
(enable counts 1/1 afterwards); display lit, taint 0.
Software restart (archive 147): display lit (owner: "it worked"). Handover at 0.89 s as on every restart boot,
but larb0 idle (stat=0 greq=0), no SMI gates line, vblank 17 → 219, taint 0. The dark panel after a software restart, open since candidate 11, is fixed.

Owner steps

Flash 43 (BOOTIMG + ANDROID). Check: holding SMI common/larb0 at boot, no SMI gates line, display lit.
With the owner's OK: one software restart; then power-off and power-on with USB plugged in.
If both stay lit: /data/updates/restart.json on and an install with no Power presses.