From: Claude Code Review Bot <claude-review@example.com>
To: dri-devel-reviews@example.com
Subject: Claude review: drm/vblank: Deferred Enable and Disable
Date: Wed, 25 Mar 2026 07:22:01 +1000 [thread overview]
Message-ID: <review-overall-20260323202755.315929-1-sunpeng.li@amd.com> (raw)
In-Reply-To: <20260323202755.315929-1-sunpeng.li@amd.com>
Overall Series Review
Subject: drm/vblank: Deferred Enable and Disable
Author: <sunpeng.li@amd.com>
Patches: 7
Reviewed: 2026-03-25T07:22:01.297418
---
This series introduces deferred vblank enable/disable for DRM, motivated by AMD's IPS (Idle Power States) feature where the DCN block can be power-gated and re-enabling requires acquiring a mutex (blocking operation) that cannot be done from atomic context. The approach defers `drm_vblank_enable()` and `vblank_disable_fn()` to a workqueue, with pre/post hooks for drivers to do blocking work.
The design is reasonable for the stated problem, but there are several concurrency concerns in patch 2 that need attention — particularly around races between deferred enable, deferred disable, and `drm_crtc_vblank_off()`. The series also unconditionally allocates a workqueue for all DRM devices even when no driver uses deferred vblank.
---
Generated by Claude Code Patch Reviewer
next prev parent reply other threads:[~2026-03-24 21:22 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-23 20:27 [PATCH v2 0/5] drm/vblank: Deferred Enable and Disable sunpeng.li
2026-03-23 20:27 ` [PATCH v2 1/5] drm/vblank: Add drm_crtc_vblank_is_off() helper sunpeng.li
2026-03-24 20:20 ` Mario Limonciello
2026-03-24 21:22 ` Claude review: " Claude Code Review Bot
2026-03-23 20:27 ` [PATCH v2 2/5] drm/vblank: Introduce deferred vblank enable/disable sunpeng.li
2026-03-24 21:22 ` Claude review: " Claude Code Review Bot
2026-03-23 20:27 ` [PATCH v2 3/5] drm/amd/display: Refactor amdgpu_dm_crtc_set_vblank sunpeng.li
2026-03-24 21:22 ` Claude review: " Claude Code Review Bot
2026-03-23 20:27 ` [PATCH v2 4/5] drm/amd/display: Implement deferred vblanks on IPS platforms sunpeng.li
2026-03-24 21:22 ` Claude review: " Claude Code Review Bot
2026-03-23 20:27 ` [PATCH v2 5/5] drm/vblank: Add some debugging trace events sunpeng.li
2026-03-24 21:22 ` Claude review: " Claude Code Review Bot
2026-03-24 21:22 ` Claude Code Review Bot [this message]
-- strict thread matches above, loose matches on Subject: below --
2026-02-24 21:26 [PATCH 0/5] drm/vblank: Deferred Enable and Disable sunpeng.li
2026-02-27 4:40 ` Claude review: " Claude Code Review Bot
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