Claude review: drm: handle IRQ_HPD events correctly

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Overall Series Review

Subject: drm: handle IRQ_HPD events correctly
Author: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Patches: 8
Reviewed: 2026-04-23T09:07:42.466808

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This is a well-structured 6-patch series from Dmitry Baryshkov that addresses a real gap in the DRM/USB-C DisplayPort AltMode subsystem: the inability to propagate IRQ_HPD (short hotplug pulses / sink attention requests) through the out-of-band hotplug path. This is critical for DP MST support over USB-C, where MST sideband messages are delivered via IRQ_HPD.

The approach is sound:
1. Introduce `enum drm_connector_status_extra` to carry additional event information alongside HPD status
2. Thread this new parameter through the connector, bridge, and aux-hpd APIs
3. Provide backward-compatible inline wrappers so existing callers don't need updating
4. Wire up consumers: MSM DP driver, PMIC GLINK altmode, and Huawei Gaokun UCSI

The layering is clean -- core API changes first, then bridge plumbing, then driver consumers. The backward-compatible wrappers (`drm_bridge_hpd_notify()`, `drm_aux_hpd_bridge_notify()`) are a pragmatic choice to avoid cross-tree merge complications.

**Minor issues found:** One typo in a commit message, one stray cosmetic change, and a question about the `_extra` naming suffix. No correctness bugs identified.

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