Claude review: drm/v3d: Fix RPi 4 system hangs from stale cache and MMU state

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

Overall Series Review

Subject: drm/v3d: Fix RPi 4 system hangs from stale cache and MMU state
Author: =?utf-8?q?Ma=C3=ADra_Canal?= <mcanal@igalia.com>
Patches: 5
Reviewed: 2026-06-04T15:23:14.775724

---

This is a well-structured, well-motivated bugfix series from Maíra Canal (Igalia) addressing hard system hangs on Raspberry Pi 4 (V3D 4.2) during GPU load. The series identifies three distinct cache/MMU coherency issues exposed by runtime PM transitions, fixes them in order of root-cause depth, and then follows up with a justified reduction of the autosuspend delay that was previously inflated as a workaround.

The patches are logically ordered: patch 1 fixes a pre-existing cache race (GFXH-1897), patch 2 fixes the critical flush-skipped-during-resume bug, patch 3 ensures dirty caches are written back before power-off, and patch 4 harvests the benefit. The commit messages are clear, the code changes are minimal and targeted, and each patch addresses exactly one problem.

**Verdict: Series looks correct and ready to merge.** I have one minor observation on patch 3 and a question about patch 4 that are worth considering but neither is a blocker.

---
Generated by Claude Code Patch Reviewer