[PATCH v3 0/6] drm: handle IRQ_HPD events correctly

[Dmitry Baryshkov]

Both DisplayPort and HDMI standards define a way for the Sink / display
to notify the Source / host about some kinds of events. In case of HDMI
it's as simple as singnalling changes to the EDID. In case of
DisplayPort it's more complicated and requires actual checking of the
DPCD registers.

Currently USB-C drivers don't have a way to deliver the IRQ_HPD
notifications, leading to missing MST notifications. Provide necessary
plumbing to let IRQ_HPD events be passed to the DisplayPort drivers.

Note: the Yoga C630 UCSI driver and Acer Aspire1 EC driver are not yet
enabled to send the IRQ_HPD events. Both of them would need some more
reverse engineering to find out how the event is being reported by the
EC.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov at oss.qualcomm.com>
---
Changes in v3:
- Fixed build error if aux bridges are disabled (Intel GFX CI)
- Link to v2: https://patch.msgid.link/20260420-hpd-irq-events-v2-0-402ffe27e9e9@oss.qualcomm.com

Changes in v2:
- Change irq_hpd arg to be an enum, possibly desribing other uses (Toni)
- Account for that, chaning the API accordingly (with_irq -> extra,
  etc.)
- Wire up AUX bridge notifications
- Link to v1: https://patch.msgid.link/20260416-hpd-irq-events-v1-0-1ab1f1cfb2b2@oss.qualcomm.com

---
Dmitry Baryshkov (6):
      drm/connector: report IRQ_HPD events to drm_connector_oob_hotplug_event()
      drm/bridge: pass down IRQ_HPD to the drivers
      drm/bridge: aux-hpd: let drivers pass IRQ_HPD events
      drm/msm: dp: handle the IRQ_HPD events reported by USB-C
      soc: qcom: pmic-glink-altmode: pass down HPD_IRQ events
      usb: typec: ucsi: huawei-gaokun: pass down HPD_IRQ events

 drivers/gpu/drm/bridge/aux-hpd-bridge.c        | 11 +++++----
 drivers/gpu/drm/bridge/chrontel-ch7033.c       |  3 ++-
 drivers/gpu/drm/bridge/lontium-lt8912b.c       |  3 ++-
 drivers/gpu/drm/bridge/lontium-lt9611uxc.c     |  3 ++-
 drivers/gpu/drm/bridge/ti-tfp410.c             |  4 ++--
 drivers/gpu/drm/display/drm_bridge_connector.c | 22 ++++++++++--------
 drivers/gpu/drm/drm_bridge.c                   | 20 ++++++++++-------
 drivers/gpu/drm/drm_connector.c                |  7 ++++--
 drivers/gpu/drm/i915/display/intel_dp.c        |  3 ++-
 drivers/gpu/drm/meson/meson_encoder_hdmi.c     |  3 ++-
 drivers/gpu/drm/msm/dp/dp_display.c            |  6 ++++-
 drivers/gpu/drm/msm/dp/dp_drm.h                |  3 ++-
 drivers/gpu/drm/omapdrm/dss/hdmi4.c            |  3 ++-
 drivers/soc/qcom/pmic_glink_altmode.c          |  6 ++++-
 drivers/usb/typec/altmodes/displayport.c       | 15 +++++++++----
 drivers/usb/typec/ucsi/ucsi_huawei_gaokun.c    | 11 +++++----
 include/drm/bridge/aux-bridge.h                | 13 +++++++++--
 include/drm/drm_bridge.h                       | 31 +++++++++++++++++++++-----
 include/drm/drm_connector.h                    | 22 ++++++++++++++++--
 19 files changed, 138 insertions(+), 51 deletions(-)
---
base-commit: c7275b05bc428c7373d97aa2da02d3a7fa6b9f66
change-id: 20260414-hpd-irq-events-e72bc076a5f1

Best regards,
--  
With best wishes
Dmitry