claude-noether/ampere-vp9-enablement
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claude-noether eb60ecd224 Phase 0: open campaign + substrate findings 
Open ampere-vp9-enablement to enable VP9 hardware decode on RK3588 ampere
(rkvdec / vdpu381 register layout). Sibling to ampere-kernel-decoders
(closed at HEVC bit-perfect 2026-05-17 ~00:42).

Phase 0 substrate locked: upstream status (Collabora roadmap, no series
posted), legacy code reference (rkvdec-vp9.c 1042 lines, vdpu341),
vdpu381 pattern reference (rkvdec-vdpu381-hevc.c, struct-based regs +
common-file split), work-plan outline, open questions (chiefly: where
is the vdpu381 VP9 register layout documented), risk register.

Phase 1 (architectural plan + Sonnet review) next session.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
2026-05-16 22:48:26 +00:00

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ampere-vp9-enablement

Stand-alone port + upstream-targeting work to enable VP9 hardware decode on Rockchip RK3588's rkvdec (vdpu381 register layout).

Status (2026-05-17 ~01:00)

Upstream RK3588 mainline rkvdec (Casanova v7.0 series, landed in Linux 7.0) supports H.264 + HEVC only. VP9 is on Collabora's stated roadmap but no WIP series has been posted to linux-media as of this campaign open. The legacy rkvdec-vp9.c (RK3399 / vdpu341 hardware) is feature-complete at 1042 lines but its register-config logic does not translate directly to vdpu381.

This campaign:

  1. Ports VP9 enablement to vdpu381 register layout (new file rkvdec-vdpu381-vp9.c)
  2. Registers VP9 V4L2 controls in vdpu38x_vp9_ctrl_descs[]
  3. Adds VP9 fmt to vdpu381_coded_fmts[] with the new ops
  4. Verifies bit-perfect HW vs SW decode (per feedback_compare_hw_against_sw_reference)
  5. Proposes upstream via linux-media

Sibling campaign: ampere-kernel-decoders closed at HEVC bit-perfect (kernel-agent#14 + #15 are the prerequisite kernel fixes).

Scope (out of)

  • VP9 on RK3399 (works via legacy rkvdec-vp9.c already in mainline)
  • VP9 on hantro (hantro decoder on RK3588 doesn't expose VP9; this campaign targets rkvdec)
  • AV1 on RK3588 (separate work; AV1 is on hantro fdc70000 already + per Collabora)
  • VP8 (already works via hantro)
  • HEVC (closed in ampere-kernel-decoders)

Process

8-phase loop (per ~/.claude/CLAUDE.md). All commits via claude-noether identity. Patches will be RFC-quality and routed via kernel-agent once ready.

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