claude-noether
a87678bbbf
The translation guide for porting rkvdec_vp9_run and its config_* helpers from the flat vdpu34x register layout to the segmented vdpu381 layout. Each row maps a legacy field to its new location across the 4 segments (common, vp9_param, common_addr, vp9_addr). Key semantic deltas captured: - reg02.dec_mode → reg009_dec_mode.dec_mode (VDPU381_MODE_VP9=2) - Per-ref indexed arrays (reg17_19[i], reg29_31[i], reg37_39[i], reg48_50[i]) become separate per-frame-slot registers (last/golden/altref triplets) in vdpu381 - Decode trigger moves from RKVDEC_REG_INTERRUPT=0x004 + RKVDEC_INTERRUPT_DEC_E mask to VDPU381_REG_DEC_E=0x028 + VDPU381_DEC_E_BIT (single bit) - reg09.yuv_virstride dropped (legacy-only convenience field) - reg51.lastref_yuv_virstride dropped (not in vdpu381 layout) - NEW fields surfaced: reg103_frame_flags (intra_only, prob_update_en, refresh_en, allow_high_precision_mv, interp_filter_switch_en), reg064_cprheader.cprheader_offset, reg105.count_update_en Also captures 5 open questions for the next code-writing session (prob-index rotation, delta_prob_base aliasing, RCB integration, timeout threshold sizing). This document IS the load-bearing artifact for the Phase 2 backend implementation. The .c file translation walks this table line-by-line. Companion to commit 47431635801d (regs header VP9 struct definitions). Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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:
- Ports VP9 enablement to vdpu381 register layout (new file
rkvdec-vdpu381-vp9.c) - Registers VP9 V4L2 controls in
vdpu38x_vp9_ctrl_descs[] - Adds VP9 fmt to
vdpu381_coded_fmts[]with the new ops - Verifies bit-perfect HW vs SW decode (per feedback_compare_hw_against_sw_reference)
- 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.calready 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.