BFE Engineering
42fb386f60
Replace every em dash with real punctuation (rewrites, not hyphen swaps) in docs, code comments, scripts, configs, and the port records; convert en dashes, curly quotes, ellipsis glyphs, arrows, and section signs to ASCII; drop machine-writing tell phrases from living docs. ADR titles now use a colon. The M2 bring-up DTS model string carried an em dash into the patch series and its record echoes; fixed at both, and the full series re-verified to apply cleanly onto pristine 6.18.46. One comment in freshness.h deliberately names the em dash glyph the UI renders as the unknown mark; that is data, kept as prose naming it. Verified: cargo tests (sim, config-lint, rs485-bridge), shellcheck, both driver MC/DC harnesses, patches-apply.
28 lines
1.5 KiB
Markdown
28 lines
1.5 KiB
Markdown
# RGA port: DONE, verified on hardware (2026-08-24)
|
|
|
|
Ported the vendor char-dev RGA driver (`drivers/video/rockchip/rga3/`, the
|
|
multicore `CONFIG_ROCKCHIP_MULTI_RGA` driver: WardenOS's librga uses `/dev/rga`,
|
|
not V4L2) to 6.18. Open source (vendor C source). On warden-c8a3:
|
|
```
|
|
rga: rga2, irq = 55, match scheduler
|
|
rga: rga2 hardware loaded successfully, hw_version:3.3.87975
|
|
rga: rga2 probe successfully -> /dev/rga present, /dev/dma_heap present
|
|
```
|
|
|
|
## Build tree wiring
|
|
`drivers/video/rockchip/{Kconfig,Makefile}` created (source rga3/); wired into
|
|
`drivers/video/{Kconfig,Makefile}`. `CONFIG_ROCKCHIP_MULTI_RGA=y`.
|
|
`&rga2 { status="okay"; }`. For `/dev/dma_heap/cma`: use the kernel's default 64 MiB
|
|
CMA + `CONFIG_DMABUF_HEAPS{,_CMA,_SYSTEM}=y`; do NOT add a `linux,cma` DT node
|
|
(a mis-aligned/duplicate one hangs the boot at reserved-memory init).
|
|
|
|
## 5.10 -> 6.18 API deltas fixed (all mechanical)
|
|
1. `platform_driver.remove`: `int` -> `void` (`rga_drv_remove`, drop the returns).
|
|
2. `hrtimer_init(&t,...)` + `t.function=fn` -> `hrtimer_setup(&t, fn, CLOCK_MONOTONIC,
|
|
HRTIMER_MODE_REL)`: the scheduler tick; verified under the live probe.
|
|
3. `iommu_map` / `iommu_map_sg`: added the new `gfp` arg (`GFP_KERNEL`).
|
|
4. `get_user_pages_remote`: dropped the removed `vmas` arg.
|
|
5. `MAX_ORDER` (removed) -> compat `#define MAX_ORDER (MAX_PAGE_ORDER + 1)` in
|
|
`rga3/include/rga_drv.h` (preserves the old exclusive semantics everywhere).
|
|
6. `MODULE_IMPORT_NS(<token>)` -> `MODULE_IMPORT_NS("DMA_BUF")` (string form).
|