fix: switch Pocket DS lower panel to ST7703

[pacoa-kdbg]

Summary

Switch the AYANEO Pocket DS lower panel from the bespoke generated panel-ar11-5inch/AR11 path to the Sitronix ST7703 panel path, and model the lower-panel power/backlight rails so Game Mode can actually make the bottom screen dark.

Changes:

• Replace the old Pocket DS lower-panel compatible with ayaneo,pocket-ds-lower-panel handled by the ST7703 panel driver.
• Update Pocket DS DTS wiring:
  • vcc-supply = <&sgm3804>
  • iovcc-supply = <&vreg_panel1_iovcc>
  • vreg_panel1_iovcc wraps TCA6408 GPIO0 as a fixed 1.8 V regulator
  • lower panel remains wired to the SY7758 backlight provider
  • old bespoke enable-gpio path is removed
• Enable CONFIG_DRM_PANEL_SITRONIX_ST7703 and drop the obsolete AR11 panel config request.
• Make the SY7758 enable GPIO optional: Pocket DS can probe the SY7758 without a separately-described enable pin, and the first live test proved requiring one blocked the whole lower DSI chain.
• Add static Pocket DS lower-backlight/DTS tests that apply the DTS edit patch locally.

Companion PR

• Userspace/session side: https://github.com/virtudude/armada/pull/160

Test Plan

• bash tests/pocket-ds-bottom-backlight-test.sh static
  • Pocket DS bottom-backlight static checks passed
• bash tests/pocket-ds-dsi2-dts-test.sh
  • Pocket DS ST7703 lower-panel DTS checks passed
• for test_file in tests/*-test.sh; do bash "$test_file"; done
  • all current tests pass
• git diff --check -- ':!*.patch'
  • passes; .patch files are excluded because patch context lines can false-positive on normal diff markers/context indentation.
• Built full kernel artifact on GPD Win5:
  • artifact: out-win5-sy7758-optional/armada-kernel-7.0.11.tar.zst
  • sha256: aa5f431ca93be1d584044b885a885e66e08d6180152d56c2c155127918249881
  • archive contains vmlinuz, qcs8550-ayaneo-pocketds.dtb, and .armada-source

Live Pocket DS validation

Validated on real AYANEO Pocket DS hardware with a reversible boot/kernel hotfix and offline recovery backup:

• First pre-SY7758-fix boot failed as expected:
  • no DRM card/connectors
  • ae96000 DSI deferred
  • sy7758 failed on missing enable GPIO
• After making enable-gpios optional and rebuilding on Win5:
  • booted successfully: Linux fedora 7.0.11 #1 SMP PREEMPT Mon Jul 27 17:01:26 PDT 2026
  • DRM healthy: card0, card0-DSI-1, card0-DSI-2, renderD128
  • lower panel bound: panel-sitronix-st7703/ae96000.dsi.0
  • SY7758 bound: sy7758/1-002e
  • runtime smoke validation passed before the hardcoded-host test helper was removed from the PR
• Game/Desktop physical validation with companion userspace PR:
  • Game Mode: lower screen/backlight physically dark
  • Desktop Mode: bottom screen lit and correctly oriented

Notes

• This PR intentionally separates kernel/power sequencing from the session policy in the companion Armada PR.
• PR CI status should be treated as build validation; published/signed installability depends on repository workflow policy for PR events.

[virtudude]

Can you delete instead if the symbol is gone?

[pacoa-kdbg]

Addressed in 487f2fe: removed the obsolete AR11 config line entirely and left only CONFIG_DRM_PANEL_SITRONIX_ST7703=y.

[virtudude]

should this host be hard coded here?

[pacoa-kdbg]

Addressed in 487f2fe: removed the runtime/on-device helper and the TARGET_HOST default entirely; the committed tests now only run static local checks and apply the DTS edit patch in a temp tree.

[pacoa-kdbg]

Provenance pass update:

• Restored kernel/dts/qcs8550-ayaneo-pocketds.dts to the vendored ROCKNIX DTS from main; Armada-specific lower-panel wiring now lives in kernel/dts/qcs8550-ayaneo-pocketds.dts.patch again.
• Updated kernel/PATCHES.md to keep the existing ROCKNIX source entry for the base Pocket DS patch and explicitly note that our 0053-gpu-panel-add-Pocket-DS-lower-panel-driver.patch is modified to replace the generated AR11 driver with Alexandre/Azkali Fedora DS ST7703 lower-panel support.
• Updated the dts/qcs8550-ayaneo-pocketds.dts.patch entry to explain that it is Armada edits on top of the ROCKNIX Pocket DS DTS and follows the Azkali/Fedora DS ST7703/iovcc model.
• Removed the hardcoded-host runtime test helper; remaining tests are local/static and apply the DTS edit patch in a temp tree before asserting final wiring.