[PATCH v5 0/8] 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@xxxxxxxxxxxxxxxx>
---
Changes in v5:
- Renamed drm_connector_status_extra to drm_connector_dp_event (Maxime)
- Link to v4: https://patch.msgid.link/20260608-hpd-irq-events-v4-0-30b62b335487@xxxxxxxxxxxxxxxx

Changes in v4:
- Renamed drm_connector_oob_hotplug_event() to
  drm_connector_dp_oob_status() (Maxime)
- Reworked commit messages, explaining what it is about (Bjorn)
- Rearranged commits, making them a bit more logical.
- Link to v3: https://patch.msgid.link/20260421-hpd-irq-events-v3-0-44d2bf40dfc2@xxxxxxxxxxxxxxxx

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@xxxxxxxxxxxxxxxx

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@xxxxxxxxxxxxxxxx

To: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
To: Maxime Ripard <mripard@xxxxxxxxxx>
To: Thomas Zimmermann <tzimmermann@xxxxxxx>
To: David Airlie <airlied@xxxxxxxxx>
To: Simona Vetter <simona@xxxxxxxx>
To: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
To: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
To: Andrzej Hajda <andrzej.hajda@xxxxxxxxx>
To: Neil Armstrong <neil.armstrong@xxxxxxxxxx>
To: Robert Foss <rfoss@xxxxxxxxxx>
To: Laurent Pinchart <Laurent.pinchart@xxxxxxxxxxxxxxxx>
To: Jonas Karlman <jonas@xxxxxxxxx>
To: Jernej Skrabec <jernej.skrabec@xxxxxxxxx>
To: Luca Ceresoli <luca.ceresoli@xxxxxxxxxxx>
To: Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx>
To: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
To: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
To: Tvrtko Ursulin <tursulin@xxxxxxxxxxx>
To: Francesco Dolcini <francesco@xxxxxxxxxx>
To: Kevin Hilman <khilman@xxxxxxxxxxxx>
To: Jerome Brunet <jbrunet@xxxxxxxxxxxx>
To: Martin Blumenstingl <martin.blumenstingl@xxxxxxxxxxxxxx>
To: Rob Clark <robin.clark@xxxxxxxxxxxxxxxx>
To: Dmitry Baryshkov <lumag@xxxxxxxxxx>
To: Abhinav Kumar <abhinav.kumar@xxxxxxxxx>
To: Jessica Zhang <jesszhan0024@xxxxxxxxx>
To: Sean Paul <sean@xxxxxxxxxx>
To: Marijn Suijten <marijn.suijten@xxxxxxxxxxxxxx>
To: Tomi Valkeinen <tomi.valkeinen@xxxxxxxxxxxxxxxx>
To: Bjorn Andersson <andersson@xxxxxxxxxx>
To: Konrad Dybcio <konradybcio@xxxxxxxxxx>
To: Pengyu Luo <mitltlatltl@xxxxxxxxx>
To: Abel Vesa <abelvesa@xxxxxxxxxx>
Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: linux-usb@xxxxxxxxxxxxxxx
Cc: intel-gfx@xxxxxxxxxxxxxxxxxxxxx
Cc: intel-xe@xxxxxxxxxxxxxxxxxxxxx
Cc: linux-amlogic@xxxxxxxxxxxxxxxxxxx
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Cc: linux-arm-msm@xxxxxxxxxxxxxxx
Cc: freedreno@xxxxxxxxxxxxxxxxxxxxx

---
Dmitry Baryshkov (8):
      drm/connector: report out-of-band IRQ_HPD events
      drm/connector: pass down IRQ_HPD to the drivers
      drm/bridge: aux-hpd: let drivers pass IRQ_HPD events
      drm/bridge: pass extra events to the HPD callback
      drm/bridge: pass down IRQ_HPD to the drivers
      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             |  3 ++-
 drivers/gpu/drm/display/drm_bridge_connector.c | 22 ++++++++++--------
 drivers/gpu/drm/drm_bridge.c                   | 20 ++++++++++-------
 drivers/gpu/drm/drm_connector.c                | 22 ++++++++++--------
 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            | 10 +++++----
 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       | 23 ++++++++++++-------
 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                    | 24 +++++++++++++++++---
 19 files changed, 152 insertions(+), 65 deletions(-)
---
base-commit: 3f2425f5b5bbbdd991ca9cdfd5502e68d8895998
change-id: 20260414-hpd-irq-events-e72bc076a5f1

Best regards,
--  
With best wishes
Dmitry