Fix ODROID-C2 USB hotplug

[agners]

It seems that USB autosuspend interacting badly with dwc2 on Meson-GXBB: with nothing plugged into the GL852G's downstream ports at boot, the hub idle-suspends, and dwc2 on this SoC doesn't reliably wake on a downstream port-status-change. Devices present at boot enumerate before autosuspend kicks in.

Fix by disabling USB autosuspend on this particular board.

Came up during tests with Linux 6.18. The issue was already present in 6.12 and probably earlier, and also got noted in #1703 (comment).

Summary by CodeRabbit

• Chores
  • Updated kernel configuration for Odroid C2 device with device-specific USB settings adjustments.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: 5dcb2bfd-dba8-4c13-80b7-e67c971ed2c4

📥 Commits

Reviewing files that changed from the base of the PR and between ae74dad and 2078ee6.

📒 Files selected for processing (2)

• buildroot-external/board/hardkernel/odroid-c2/kernel.config
• buildroot-external/configs/odroid_c2_defconfig

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📝 Walkthrough

Walkthrough

Two files are modified to add USB autosuspend delay configuration to the Odroid C2 board: a new kernel config fragment disables the delay setting, and the defconfig is updated to reference this fragment during kernel build.

Changes

Cohort / File(s)	Summary
Odroid C2 Kernel Configuration buildroot-external/board/hardkernel/odroid-c2/kernel.config, buildroot-external/configs/odroid_c2_defconfig	New kernel config fragment adds CONFIG_USB_AUTOSUSPEND_DELAY=-1 to disable USB autosuspend, and defconfig is updated to include this fragment in the kernel build configuration.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 USB stays awake today,
No naps on Odroid's way!
Autosuspend delay erased,
This bunny code's been placed! ⚡

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'Fix ODROID-C2 USB hotplug' directly corresponds to the main change: disabling USB autosuspend to resolve a USB hotplug issue on ODROID-C2 boards.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix-odroid-c2-hotplug

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[sairon]

Nice catch, thanks!