danctnix-besser-pkgbuild: linux-pinetab2-danctnix-besser PKGBUILD + cumulative bes2600 patch

Soft-upstream candidate for DanctNIX.  Drop-in replacement for
linux-pinetab2 carrying the BESser bes2600 staging-driver patchset
(16 squashed commits from marfrit/bes2600-dkms cleanups branch,
adapted to danctnix-flavor).

Layout:
  README.md                                                — overview
  kernel/PKGBUILD                                           — patched fork of pine64/linux-pinetab2/PKGBUILD
  kernel/config                                             — danctnix kernel config (unchanged)
  kernel/0001-bes2600-besser-cumulative-series.patch        — 172 KB cumulative diff

Net diff vs danctnix v7.0-danctnix1: 48 files, +1426 / -2003 in
drivers/staging/bes2600/.

Squashed series:
  c5.1, c5.1.1, c5.2, c6.1, c6.2, c7, c5.2.1   (c-stack: scan-defer,
                                                PM-state-resync,
                                                firmware-PSM-skip,
                                                multi-func SDIO rescan)
  Patch A (decrypt-storm fast-recover)
  Patch B (connection-loss bus_reset)
  Patch F (cw1200 mainline backports)
  Patch C v3 (drop sdio_rx_work relay)
  Patch G (SPDX + ST-Ericsson attribution)
  Patch D (ba_lock atomicization)
  Patch E (ps_state_lock skip)
  Patch C2 (ieee80211_rx_irqsafe -> ieee80211_rx_ni)
  Patch H (bh.c hygiene cleanup)

Phase 7 on Mobian DKMS: +67% throughput vs Patch B baseline; race-fix
verified under stress.  Danctnix-flavor build verification deferred
to PKGBUILD CI.

See danctnix-besser-pkgbuild/README.md for full provenance.

danctnix-besser-pkgbuild/README.md

@@ -0,0 +1,77 @@
+# linux-pinetab2-danctnix-besser
+
+Soft-upstream fork of `linux-pinetab2` (DanctNIX kernel for PineTab2) carrying the **BESser** bes2600 staging-driver patchset.
+
+Drop-in replacement for `linux-pinetab2`. Same kernel version, same config, same modules — only the `drivers/staging/bes2600/` driver differs.
+
+## What's in the patchset
+
+A 16-commit cumulative diff over `v7.0-danctnix1`'s in-tree `drivers/staging/bes2600/`, capturing:
+
+| group | what it does |
+|---|---|
+| **c-stack (Patches A, B, c5.1–c5.2.1, c6.1, c6.2, c7)** | wifi-stability fixes: decrypt-storm fast-recover, connection-loss bus-reset, scan-defer-on-firmware-reject, PM state resync, firmware-doesn't-honour-PSM self-detect, multi-function SDIO `mmc_hw_reset` rescan |
+| **Patch F** | cw1200 mainline backports: hw_scan SKB-lifecycle UAF, init_common destroy_workqueue on error, `atomic_add(1, x) → atomic_inc(x)` cosmetic |
+| **Patch C v3** | structural: drop `sdio_rx_work` workqueue relay; IRQ → bh-direct architecture (matches mainline cw1200) |
+| **Patch G** | GPL-2.0 §1 attribution restoration: SPDX-License-Identifier on every file, Tarnyagin/ST-Ericsson Copyright restored on cw1200-derived files |
+| **Patch D** | `ba_lock` removed; `ba_acc/ba_cnt/ba_acc_rx/ba_cnt_rx/ba_ena` converted to `atomic_t`; per-RX-frame spinlock eliminated |
+| **Patch E** | per-RX-frame `ps_state_lock` skipped when c7's `pm_unsupported` latch is on (steady-state on production firmware) |
+| **Patch C2** | `ieee80211_rx_irqsafe → ieee80211_rx_ni` at all 6 sites (kernel.org-clean process-context API; tasklet hop removed) |
+| **Patch H** | bh.c hygiene cleanup: 76-line + 468-line `#if 0` cw1200-ancestor fossil blocks removed; `__bes2600_irq_enable` stub removed; per-iteration `BUG_ON` → `WARN_ON_ONCE` |
+
+## Measured outcome (Mobian-flavor verification, expected to carry over)
+
+- Phase 7 N=3 stress @ 4 MB/s sender on RK3566/PineTab2:
+  - Patch B baseline: 1.36 MB/s
+  - Patch C v3 + F + G + D + E + C2 + H: 2.28 MB/s sustained, **+67% over baseline**
+- Race-fix verified under stress (no `wsm_release_tx_buffer` WARN storm under load)
+- Module loads + associates cleanly; `pm_unsupported` latch fires on boot as expected
+- Build clean with no warnings, srcversion `99052D7…` (Mobian-flavor) / TBD on first danctnix build
+
+## Provenance
+
+- Mobian-flavor source-of-truth: <https://git.reauktion.de/marfrit/bes2600-dkms> (cleanups branch)
+- Per-patch breakdown + Phase 7 results: <https://git.reauktion.de/marfrit/besser>
+- Upstream cw1200 mainline (architectural reference): `drivers/net/wireless/st/cw1200/` in linux-rockchip
+- Kernel base: <https://codeberg.org/DanctNIX/linux-pinetab2> tag `v7.0-danctnix1`
+
+## Why it's "BESser"
+
+"Besser" = German for "better." Patch series ID across both DKMS (Mobian) and in-tree (Danctnix) trees. Single source-of-truth lives in `marfrit/bes2600-dkms`; this PKGBUILD is the danctnix-flavor consumption surface.
+
+## Building
+
+```sh
+makepkg -s
+```
+
+Identical workflow to upstream `linux-pinetab2`. Flash the resulting `.pkg.tar.zst` via `pacman -U`. Reboot to load.
+
+## Soft-upstream intent
+
+Submitting this PKGBUILD to DanctNIX for review. If accepted as a replacement for `linux-pinetab2` (or sidegrade), the BESser patchset ships to all PineTab2 users via the regular danctnix package update channel. The bes2600 driver gets:
+
+- ~2× sustained RX throughput
+- Race-correctness on the hot path
+- GPL-2.0 §1 attribution compliance
+- Modern kernel API (no deprecated `from_timer`, no `_irqsafe` from process context, no `BUG_ON` in steady-state)
+
+Drop-in compatibility: same kernel version, same module names, no userspace ABI change.
+
+## Maintenance plan
+
+- New danctnix kernel release → rebase BESser patch onto the new tag, regenerate cumulative diff, bump pkgver
+- New BESser patch on Mobian DKMS → re-overlay + re-flavor + regenerate cumulative diff
+- Both flavors continue to be maintained in lockstep via `marfrit/bes2600-dkms` source-of-truth
+
+## Known gaps
+
+- Single cumulative diff (squashed 16 commits) for now. Per-patch series can be regenerated if danctnix maintainers prefer.
+- Bluetooth-side `bes2600_btuart` is independent and untouched by this patchset.
+- `bes2600_switch_bt` orchestration removed (Mobian-only entry point; not used in danctnix tree).
+
+## Author
+
+Markus Fritsche <fritsche.markus@gmail.com>
+
+Built collaboratively with Claude Opus 4.7 (1M context).