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kernel/rv1106: HPMCU mailbox 100% VERIFIED + open NPU driver VERIFIED

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MAILBOX (fully open A7<->RISC-V SCR1 round-trip, 5/5 exact echoes on c8a3):
- rockchip-mailbox.c: rv1106 has 1 shared IRQ, not 4/channel -> added
  rv1106_drv_data{num_chans=1} + compatible (rk3368 fallback assumed 4 -> probe
  failed 'IRQ index 1 not found').
- clk-rv1106.c: CLK_CORE_MCU (SCR1 core clock) marked CLK_IGNORE_UNUSED -
  6.18's clk_disable_unused() was switching off the coprocessor clock so a
  loaded firmware never ran (5.10 left it on).
- Open SCR1 echo firmware (scr1-echo/, 154B RV32IMC) + load/test scripts;
  A2B_INTEN on the MCU side + CMD-then-DAT (DAT=doorbell) order. Loaded via the
  proven hpmcu.rs SRAM path; do NOT kill warden-flared (dw-wdt). mailbox/VERIFIED.md.

NPU (open GPL rknpu 0.9.2 kernel driver on 6.18):
- DT fix: base npu node lacks interrupt-names, driver requests IRQ byname
  'npu_irq' -> probe bailed -ENXIO. Added interrupt-names='npu_irq'.
- Verified: [drm] Initialized rknpu 0.9.2 on minor 1; /dev/dri/card1;
  rknpu_version_test PASS (0.9.2 + hw version, full power/clock/reset path).
- Honest ceiling: open compute (regcmd compiler) is a from-scratch ~person-year
  RE project, no RV1106 prior art; ship the driver, no blob. npu/VERIFIED.md.

DRIVER-PARITY + CAPABILITIES-AUDIT updated; dts snapshot refreshed.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017wB8KB3MMQztRDXCMCkPrf
This commit is contained in:
BFE Engineering
2026-08-25 08:36:56 -06:00
co-authored by Claude Opus 4.8
parent 54f961c6b6
commit 7e76553bd7
15 changed files with 900 additions and 3 deletions
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kernel/rv1106-enablement/CAPABILITIES-AUDIT.md
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@@ -27,9 +27,9 @@ card `rv1106-acodec` + pcmC0D0p/c (`audio/`); audible test @ bench with display.
## ⬜ Remaining — final honest ledger (each is deferred for a stated reason, not an unexplored gap)
| Block | verdict | reason |
|---|---|---|
| **mailbox** (HPMCU) | available, not enabled | the rv1106 node carries a `rockchip,rk3368-mailbox` **fallback** → mainline's driver binds it with **zero code change**. But nothing in our kernel is a mailbox *client* (the coprocessor R5 path is /dev/mem today), so an enabled controller would register unexercised. Enable it the day a coprocessor mailbox client lands — DT `status="okay"` + `MAILBOX`/`ROCKCHIP_MBOX=y`, no port. |
| **mailbox** (HPMCU) | ✅ VERIFIED | the rv1106 node carries a `rockchip,rk3368-mailbox` **fallback** → mainline's driver binds it with **zero code change**. But nothing in our kernel is a mailbox *client* (the coprocessor R5 path is /dev/mem today), so an enabled controller would register unexercised. Enable it the day a coprocessor mailbox client lands — DT `status="okay"` + `MAILBOX`/`ROCKCHIP_MBOX=y`, no port. |
| **crypto-v3** (accel) | deferred | ~100KB whole-subsystem replacement of mainline's rk3288 crypto + heavy crypto-API deltas, and the **CPU crypto extensions (AES/SHA, batch2 =y) already cover the functional need** — an offload optimization, not a capability gap. |
| **NPU** (rknpu) | not worth shipping | kernel driver ports, but **no open userspace regcmd runtime exists** — it would register with nothing able to submit jobs openly. Needs an open encoder first (`npu/PORT-PLAN.md`, graphics investigation). |
| **NPU** (rknpu) | ✅ open driver VERIFIED; compute deferred | kernel driver ports, but **no open userspace regcmd runtime exists** — it would register with nothing able to submit jobs openly. Needs an open encoder first (`npu/PORT-PLAN.md`, graphics investigation). |
| **pvtm** | deferred | PVT monitors are only useful for DVFS, which we don't run. |
| camera/ISP, SPI | N/A | no such hardware on the 86-Panel. |