BFE EngineeringandClaude Opus 4.8
fda84b4c27
Ported the vendor multicore RGA char-dev driver (drivers/video/rockchip/rga3/, CONFIG_ROCKCHIP_MULTI_RGA) to 6.18 — WardenOS's librga uses /dev/rga, not V4L2. On warden-c8a3: rga2 probe successful, hw_version 3.3.87975, /dev/rga + /dev/dma_heap present. This is the CPU-savings 2D accelerator (LVGL UI offload). 6 mechanical 5.10->6.18 API fixes (platform remove->void, hrtimer_init-> hrtimer_setup, iommu_map* gfp arg, get_user_pages_remote vmas arg, MAX_ORDER compat, MODULE_IMPORT_NS string). CMA via the default 64 MiB pool + DMABUF_HEAPS_CMA (a custom linux,cma DT node hangs boot). Recipe + deltas in rga/PORT-DONE.md. All open source (vendor C source). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_017wB8KB3MMQztRDXCMCkPrf
28 lines
1.5 KiB
Markdown
28 lines
1.5 KiB
Markdown
# RGA port — DONE, verified on hardware (2026-08-24)
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Ported the vendor char-dev RGA driver (`drivers/video/rockchip/rga3/`, the
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multicore `CONFIG_ROCKCHIP_MULTI_RGA` driver — WardenOS's librga uses `/dev/rga`,
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not V4L2) to 6.18. Open source (vendor C source). On warden-c8a3:
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```
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rga: rga2, irq = 55, match scheduler
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rga: rga2 hardware loaded successfully, hw_version:3.3.87975
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rga: rga2 probe successfully → /dev/rga present, /dev/dma_heap present
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```
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## Build tree wiring
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`drivers/video/rockchip/{Kconfig,Makefile}` created (source rga3/); wired into
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`drivers/video/{Kconfig,Makefile}`. `CONFIG_ROCKCHIP_MULTI_RGA=y`.
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`&rga2 { status="okay"; }`. For `/dev/dma_heap/cma`: use the kernel's default 64 MiB
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CMA + `CONFIG_DMABUF_HEAPS{,_CMA,_SYSTEM}=y` — do NOT add a `linux,cma` DT node
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(a mis-aligned/duplicate one hangs the boot at reserved-memory init).
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## 5.10 → 6.18 API deltas fixed (all mechanical)
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1. `platform_driver.remove`: `int` → `void` (`rga_drv_remove`, drop the returns).
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2. `hrtimer_init(&t,…)` + `t.function=fn` → `hrtimer_setup(&t, fn, CLOCK_MONOTONIC,
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HRTIMER_MODE_REL)` — the scheduler tick; verified under the live probe.
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3. `iommu_map` / `iommu_map_sg`: added the new `gfp` arg (`GFP_KERNEL`).
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4. `get_user_pages_remote`: dropped the removed `vmas` arg.
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5. `MAX_ORDER` (removed) → compat `#define MAX_ORDER (MAX_PAGE_ORDER + 1)` in
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`rga3/include/rga_drv.h` (preserves the old exclusive semantics everywhere).
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6. `MODULE_IMPORT_NS(<token>)` → `MODULE_IMPORT_NS("DMA_BUF")` (string form).
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