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quine-linux/patches/snd-hda-codec-cs8409/PROVENANCE.md
Philip Peterson c51070b7a8 Driver
2026-09-26 01:25:14 -08:00

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Provenance: vendored snd-hda-codec-cs8409 source

Origin

  • Upstream project: egorenar/snd-hda-codec-cs8409 (out-of-tree Linux HDA codec driver adding Apple Cirrus CS8409/CS42L42/CS42L83 support beyond what's in mainline).
  • Actual source vendored here comes from a fork/branch with Linux 6.17+ HDA API compatibility work, not yet merged upstream: daviddoll/snd-hda-codec-cs8409, branch kernel-6.17-hda-compat, submitted as PR #30 ("Port out-of-tree CS8409 driver for Linux 6.17+ HDA API") — open, unmerged as of the date below.
  • Pinned commit: 14e00de4290e090afd7632bc6d5c724131a19e7b (2026-04-04, "Port for Linux 6.17+ HDA codec API and modpost fixes").
  • Date vendored: 2026-09-26.

Why vendored instead of fetched at build time

This is an unmerged personal-fork branch, not a stable upstream release — it can be force-pushed, renamed, or deleted with no notice. Vendoring a verbatim copy here (original SPDX headers untouched) makes the quine-linux build offline-capable, immune to that repo's fate, and keeps the corresponding source actually present in this repo's own git history alongside the binary it produces, which is the most direct way to satisfy GPL-2.0-or-later's source-availability obligation.

What's in vendor/

All 16 files from the pinned commit, unmodified:

Makefile, README.md, .gitignore,
hda_auto_parser.h, hda_generic.h, hda_jack.h, hda_local.h,
patch_cirrus_apple.h, patch_cirrus_boot84.h, patch_cirrus_hda_generic_copy.h,
patch_cirrus_new84.h, patch_cirrus_real84.h, patch_cirrus_real84_i2c.h,
patch_cs8409-tables.c, patch_cs8409.c, patch_cs8409.h

License

GPL-2.0-or-later (verified directly from the SPDX headers present in the vendored files, e.g. patch_cs8409.c, patch_cirrus_apple.h, patch_cs8409.h, hda_generic.h). One file, patch_cs8409-tables.c, carries GPL-2.0-only specifically — the combined work is distributed here under GPL-2.0-or-later for the files that specify it, and GPL-2.0-only for that one file, matching each file's own original header.

Our changes

The actual functional fix lives as a separate patch, applied on top of this vendored tree at image-build time, not folded into the vendored copy:

  • 0001-imac19-2-force-intmike-adc-nid-fallback.patch — see ../../docs/imac19-2-mic-fix.md for the full root-cause writeup.

Keeping "what upstream wrote" (this directory) and "what we changed" (the .patch file) separate makes it trivial to re-diff against a future upstream merge of PR #30, and to drop this vendoring entirely once/if that lands.