Claude review: drm/radeon: Add HAINAN clock adjustment

[Claude Code Review Bot <claude-review@example.com>]

Overall Series Review

Subject: drm/radeon: Add HAINAN clock adjustment
Author: decce6 <decce6@proton.me>
Patches: 1
Reviewed: 2026-02-11T16:33:48.316837

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This is a single-patch series that adds hardware-specific clock speed limiting for the AMD Radeon R5 M420 GPU (HAINAN chip family). The patch attempts to address stability issues by reducing maximum clock frequencies.

**Series-level concerns:**

1. **Missing justification**: The commit message lacks critical information about why these specific frequencies were chosen and how stability issues were diagnosed
2. **Lack of testing details**: No information about testing methodology, duration, or workloads used to validate the fix
3. **Potential hardware variation**: No consideration of whether all R5 M420 GPUs need this limitation or if this is specific to certain board designs
4. **Missing documentation**: No explanation of the stability symptoms that motivated this change

**Architecture concerns:**

- The patch uses PCI device ID and revision matching, which is appropriate for hardware-specific workarounds
- The placement in `si_apply_state_adjust_rules()` is correct for the radeon driver architecture
- However, this approach may be too broad if only specific board implementations require the limitation

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