[PATCH v6 0/9] drm: handle IRQ_HPD events correctly

[PATCH v6 0/9] 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@oss.qualcomm.com>
---
Changes in v6:
- Corrected indentation of args after the function rename (Chaoyi Chen)
- Reordered / rehashed patches to be more logical (Chaoyi Chen)
- Fixed build error in the OMAPDSS HDMI driver (Sashiko)
- Fixed IRQ_HPD vs PLUG interaction in drm/msm/dp (Sashiko)
- Link to v5: https://patch.msgid.link/20260920-hpd-irq-events-v5-0-ff1de0090c72@oss.qualcomm.com

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@oss.qualcomm.com

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@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

To: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
To: Maxime Ripard <mripard@kernel.org>
To: Thomas Zimmermann <tzimmermann@suse.de>
To: David Airlie <airlied@gmail.com>
To: Simona Vetter <simona@ffwll.ch>
To: Heikki Krogerus <heikki.krogerus@linux.intel.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Andrzej Hajda <andrzej.hajda@intel.com>
To: Neil Armstrong <neil.armstrong@linaro.org>
To: Robert Foss <rfoss@kernel.org>
To: Laurent Pinchart <Laurent.pinchart@ideasonboard.com>
To: Jonas Karlman <jonas@kwiboo.se>
To: Jernej Skrabec <jernej.skrabec@gmail.com>
To: Luca Ceresoli <luca.ceresoli@bootlin.com>
To: Jani Nikula <jani.nikula@linux.intel.com>
To: Rodrigo Vivi <rodrigo.vivi@intel.com>
To: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
To: Tvrtko Ursulin <tursulin@ursulin.net>
To: Francesco Dolcini <francesco@dolcini.it>
To: Kevin Hilman <khilman@baylibre.com>
To: Jerome Brunet <jbrunet@baylibre.com>
To: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
To: Rob Clark <robin.clark@oss.qualcomm.com>
To: Dmitry Baryshkov <lumag@kernel.org>
To: Abhinav Kumar <abhinav.kumar@linux.dev>
To: Jessica Zhang <jesszhan0024@gmail.com>
To: Sean Paul <sean@poorly.run>
To: Marijn Suijten <marijn.suijten@somainline.org>
To: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
To: Bjorn Andersson <andersson@kernel.org>
To: Konrad Dybcio <konradybcio@kernel.org>
To: Pengyu Luo <mitltlatltl@gmail.com>
To: Chaoyi Chen <chaoyi.chen@rock-chips.com>
Cc: dri-devel@lists.freedesktop.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-usb@vger.kernel.org
Cc: intel-gfx@lists.freedesktop.org
Cc: intel-xe@lists.freedesktop.org
Cc: linux-amlogic@lists.infradead.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-arm-msm@vger.kernel.org
Cc: freedreno@lists.freedesktop.org

---
Dmitry Baryshkov (9):
      drm/connector: report out-of-band IRQ_HPD events
      drm/connector: pass down IRQ_HPD to the drivers
      drm/bridge: pass down IRQ_HPD to the drivers
      drm/bridge: pass extra events to the HPD callback
      drm/bridge: aux-hpd: let drivers pass IRQ_HPD events
      drm/msm/dp: don't take extra references on multiple plug 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             |  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            | 12 +++++++---
 drivers/gpu/drm/msm/dp/dp_drm.h                |  3 ++-
 drivers/gpu/drm/omapdrm/dss/hdmi4.c            |  3 ++-
 drivers/gpu/drm/omapdrm/dss/hdmi5.c            |  3 ++-
 drivers/soc/qcom/pmic_glink_altmode.c          |  6 ++++-
 drivers/usb/typec/altmodes/displayport.c       | 25 +++++++++++++--------
 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 +++++++++++++++++---
 20 files changed, 158 insertions(+), 66 deletions(-)
---
base-commit: 725953d4da85cfb97a4c309fad6346b72f8529e7
change-id: 20260414-hpd-irq-events-e72bc076a5f1

Best regards,
--  
With best wishes
Dmitry


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[PATCH v6 1/9] drm/connector: report out-of-band IRQ_HPD events

[Dmitry Baryshkov]

The DisplayPort standard defines a special kind of events called IRQ.
These events are used to notify DP Source about the events on the Sink
side. It is extremely important for DP MST handling, where the MST
events are reported through this IRQ.

In case of the USB-C DP AltMode there is no actual HPD pulse, but the
events are reported through the bits in the AltMode VDOs.

Rename drm_connector_oob_hotplug_event() to drm_connector_dp_oob_status()
and extend its interface to report IRQ events to the DisplayPort Sink
drivers.

Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
---
 drivers/gpu/drm/drm_connector.c          | 20 ++++++++++++--------
 drivers/usb/typec/altmodes/displayport.c | 25 ++++++++++++++++---------
 include/drm/drm_connector.h              | 21 +++++++++++++++++++--
 3 files changed, 47 insertions(+), 19 deletions(-)

diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
index 893716a9e489..e3c8181df6bd 100644
--- a/drivers/gpu/drm/drm_connector.c
+++ b/drivers/gpu/drm/drm_connector.c
@@ -3821,20 +3821,24 @@ struct drm_connector *drm_connector_find_by_fwnode(struct fwnode_handle *fwnode)
 }
 
 /**
- * drm_connector_oob_hotplug_event - Report out-of-band hotplug event to connector
+ * drm_connector_dp_oob_status - Report out-of-band hotplug event to DisplayPort connector
  * @connector_fwnode: fwnode_handle to report the event on
  * @status: hot plug detect logical state
+ * @event: additional event reported by the sink without changing the HPD state
+ * (or in addition to such a change).
  *
- * On some hardware a hotplug event notification may come from outside the display
- * driver / device. An example of this is some USB Type-C setups where the hardware
- * muxes the DisplayPort data and aux-lines but does not pass the altmode HPD
- * status bit to the GPU's DP HPD pin.
+ * In some cases when DisplayPort signals are being routed through the USB
+ * Type-C port the hotplug event notifications come from outside of the display
+ * driver / device. In this case hardware muxes the DisplayPort data and
+ * AUX-lines but does not pass the altmode HPD status bit to the GPU's DP HPD
+ * pin.
  *
  * This function can be used to report these out-of-band events after obtaining
  * a drm_connector reference through calling drm_connector_find_by_fwnode().
  */
-void drm_connector_oob_hotplug_event(struct fwnode_handle *connector_fwnode,
-				     enum drm_connector_status status)
+void drm_connector_dp_oob_status(struct fwnode_handle *connector_fwnode,
+				 enum drm_connector_status status,
+				 enum drm_connector_dp_event event)
 {
 	struct drm_connector *connector;
 
@@ -3847,7 +3851,7 @@ void drm_connector_oob_hotplug_event(struct fwnode_handle *connector_fwnode,
 
 	drm_connector_put(connector);
 }
-EXPORT_SYMBOL(drm_connector_oob_hotplug_event);
+EXPORT_SYMBOL(drm_connector_dp_oob_status);
 
 /**
  * drm_connector_get_color_format - Return connector color format of @conn_state
diff --git a/drivers/usb/typec/altmodes/displayport.c b/drivers/usb/typec/altmodes/displayport.c
index 51c92dd887ab..2106074417d6 100644
--- a/drivers/usb/typec/altmodes/displayport.c
+++ b/drivers/usb/typec/altmodes/displayport.c
@@ -187,9 +187,11 @@ static int dp_altmode_status_update(struct dp_altmode *dp)
 				dp->pending_irq_hpd = true;
 		}
 	} else {
-		drm_connector_oob_hotplug_event(dp->connector_fwnode,
-						hpd ? connector_status_connected :
-						      connector_status_disconnected);
+		drm_connector_dp_oob_status(dp->connector_fwnode,
+					    hpd ? connector_status_connected :
+						  connector_status_disconnected,
+					    (hpd && irq_hpd) ? DRM_CONNECTOR_DP_IRQ_HPD :
+							       DRM_CONNECTOR_NO_EXTRA_STATUS);
 		dp->hpd = hpd;
 		sysfs_notify(&dp->alt->dev.kobj, "displayport", "hpd");
 		if (hpd && irq_hpd) {
@@ -211,8 +213,11 @@ static int dp_altmode_configured(struct dp_altmode *dp)
 	 * configuration is complete to signal HPD.
 	 */
 	if (dp->pending_hpd) {
-		drm_connector_oob_hotplug_event(dp->connector_fwnode,
-						connector_status_connected);
+		drm_connector_dp_oob_status(dp->connector_fwnode,
+					    connector_status_connected,
+						dp->pending_irq_hpd ?
+						DRM_CONNECTOR_DP_IRQ_HPD :
+						DRM_CONNECTOR_NO_EXTRA_STATUS);
 		sysfs_notify(&dp->alt->dev.kobj, "displayport", "hpd");
 		dp->pending_hpd = false;
 		if (dp->pending_irq_hpd) {
@@ -396,8 +401,9 @@ static int dp_altmode_vdm(struct typec_altmode *alt,
 			dp->data.status = 0;
 			dp->data.conf = 0;
 			if (dp->hpd) {
-				drm_connector_oob_hotplug_event(dp->connector_fwnode,
-								connector_status_disconnected);
+				drm_connector_dp_oob_status(dp->connector_fwnode,
+							    connector_status_disconnected,
+							    DRM_CONNECTOR_NO_EXTRA_STATUS);
 				dp->hpd = false;
 				sysfs_notify(&dp->alt->dev.kobj, "displayport", "hpd");
 			}
@@ -844,8 +850,9 @@ void dp_altmode_remove(struct typec_altmode *alt)
 	typec_altmode_put_plug(dp->plug_prime);
 
 	if (dp->connector_fwnode) {
-		drm_connector_oob_hotplug_event(dp->connector_fwnode,
-						connector_status_disconnected);
+		drm_connector_dp_oob_status(dp->connector_fwnode,
+					    connector_status_disconnected,
+					    DRM_CONNECTOR_NO_EXTRA_STATUS);
 
 		fwnode_handle_put(dp->connector_fwnode);
 	}
diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
index 2ee7c59329aa..4f65c97a89ae 100644
--- a/include/drm/drm_connector.h
+++ b/include/drm/drm_connector.h
@@ -92,6 +92,22 @@ enum drm_connector_status {
 	connector_status_unknown = 3,
 };
 
+/**
+ * enum drm_connector_dp_event - additional events sent by the sink /
+ * display together or in replacement of the HPD status changes.
+ */
+enum drm_connector_dp_event {
+	/**
+	 * @DRM_CONNECTOR_NO_EXTRA_STATUS: No additional status reported.
+	 */
+	DRM_CONNECTOR_NO_EXTRA_STATUS,
+	/**
+	 * @DRM_CONNECTOR_DP_IRQ_HPD: DisplayPort Sink has sent the
+	 * IRQ_HPD (either by the HPD short pulse or via the AltMode event).
+	 */
+	DRM_CONNECTOR_DP_IRQ_HPD,
+};
+
 /**
  * enum drm_connector_registration_state - userspace registration status for
  * a &drm_connector
@@ -2848,8 +2864,9 @@ drm_connector_hdmi_scrambler_supported(const struct drm_connector *connector)
 		connector->hdmi.funcs->supported_hdmi_ver >= HDMI_VERSION_2_0;
 }
 
-void drm_connector_oob_hotplug_event(struct fwnode_handle *connector_fwnode,
-				     enum drm_connector_status status);
+void drm_connector_dp_oob_status(struct fwnode_handle *connector_fwnode,
+				 enum drm_connector_status status,
+				 enum drm_connector_dp_event event);
 enum drm_connector_color_format
 drm_connector_get_color_format(const struct drm_connector_state *conn_state);
 const char *drm_get_connector_type_name(unsigned int connector_type);

-- 
2.47.3


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[PATCH v6 2/9] drm/connector: pass down IRQ_HPD to the drivers

[Dmitry Baryshkov]

The DisplayPort standard defines a special kind of HPD events called
IRQ_HPD. These events are used to notify DP Source about the events on
the Sink side.

Extend drm_connector_funcs::oob_hotplug_event() to pass the
notifications about the IRQ_HPD events down to the individual drivers,
letting them handle those as required. Bridge core is converted in the
next step.

Reviewed-by: Pengyu Luo <mitltlatltl@gmail.com>
Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
---
 drivers/gpu/drm/display/drm_bridge_connector.c | 17 ++++++++++-------
 drivers/gpu/drm/drm_connector.c                |  2 +-
 drivers/gpu/drm/i915/display/intel_dp.c        |  3 ++-
 include/drm/drm_connector.h                    |  3 ++-
 4 files changed, 15 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/display/drm_bridge_connector.c b/drivers/gpu/drm/display/drm_bridge_connector.c
index 81f3e26f6fdf..898273f60cf6 100644
--- a/drivers/gpu/drm/display/drm_bridge_connector.c
+++ b/drivers/gpu/drm/display/drm_bridge_connector.c
@@ -142,7 +142,8 @@ struct drm_bridge_connector {
  */
 
 static void drm_bridge_connector_hpd_notify(struct drm_connector *connector,
-					    enum drm_connector_status status)
+					    enum drm_connector_status status,
+					    enum drm_connector_dp_event event)
 {
 	struct drm_bridge_connector *bridge_connector =
 		to_drm_bridge_connector(connector);
@@ -155,7 +156,8 @@ static void drm_bridge_connector_hpd_notify(struct drm_connector *connector,
 }
 
 static void drm_bridge_connector_handle_hpd(struct drm_bridge_connector *drm_bridge_connector,
-					    enum drm_connector_status status)
+					    enum drm_connector_status status,
+					    enum drm_connector_dp_event event)
 {
 	struct drm_connector *connector = &drm_bridge_connector->base;
 	struct drm_device *dev = connector->dev;
@@ -164,7 +166,7 @@ static void drm_bridge_connector_handle_hpd(struct drm_bridge_connector *drm_bri
 	connector->status = status;
 	mutex_unlock(&dev->mode_config.mutex);
 
-	drm_bridge_connector_hpd_notify(connector, status);
+	drm_bridge_connector_hpd_notify(connector, status, event);
 
 	drm_kms_helper_connector_hotplug_event(connector);
 }
@@ -172,16 +174,17 @@ static void drm_bridge_connector_handle_hpd(struct drm_bridge_connector *drm_bri
 static void drm_bridge_connector_hpd_cb(void *cb_data,
 					enum drm_connector_status status)
 {
-	drm_bridge_connector_handle_hpd(cb_data, status);
+	drm_bridge_connector_handle_hpd(cb_data, status, DRM_CONNECTOR_NO_EXTRA_STATUS);
 }
 
 static void drm_bridge_connector_oob_hotplug_event(struct drm_connector *connector,
-						   enum drm_connector_status status)
+						   enum drm_connector_status status,
+						   enum drm_connector_dp_event event)
 {
 	struct drm_bridge_connector *bridge_connector =
 		to_drm_bridge_connector(connector);
 
-	drm_bridge_connector_handle_hpd(bridge_connector, status);
+	drm_bridge_connector_handle_hpd(bridge_connector, status, event);
 }
 
 static void drm_bridge_connector_enable_hpd(struct drm_connector *connector)
@@ -301,7 +304,7 @@ static int drm_bridge_connector_detect_ctx(struct drm_connector *connector,
 				return ret;
 		}
 
-		drm_bridge_connector_hpd_notify(connector, status);
+		drm_bridge_connector_hpd_notify(connector, status, DRM_CONNECTOR_NO_EXTRA_STATUS);
 	} else {
 		switch (connector->connector_type) {
 		case DRM_MODE_CONNECTOR_DPI:
diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
index e3c8181df6bd..90e27d0b165c 100644
--- a/drivers/gpu/drm/drm_connector.c
+++ b/drivers/gpu/drm/drm_connector.c
@@ -3847,7 +3847,7 @@ void drm_connector_dp_oob_status(struct fwnode_handle *connector_fwnode,
 		return;
 
 	if (connector->funcs->oob_hotplug_event)
-		connector->funcs->oob_hotplug_event(connector, status);
+		connector->funcs->oob_hotplug_event(connector, status, event);
 
 	drm_connector_put(connector);
 }
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 0cd5e6b5034c..911c3b269279 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -6760,7 +6760,8 @@ static int intel_dp_connector_atomic_check(struct drm_connector *_connector,
 }
 
 static void intel_dp_oob_hotplug_event(struct drm_connector *_connector,
-				       enum drm_connector_status hpd_state)
+				       enum drm_connector_status hpd_state,
+				       enum drm_connector_dp_event event)
 {
 	struct intel_connector *connector = to_intel_connector(_connector);
 	struct intel_display *display = to_intel_display(connector);
diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
index 4f65c97a89ae..39814f10fcd4 100644
--- a/include/drm/drm_connector.h
+++ b/include/drm/drm_connector.h
@@ -1974,7 +1974,8 @@ struct drm_connector_funcs {
 	 * has been received from a source outside the display driver / device.
 	 */
 	void (*oob_hotplug_event)(struct drm_connector *connector,
-				  enum drm_connector_status status);
+				  enum drm_connector_status status,
+				  enum drm_connector_dp_event event);
 
 	/**
 	 * @debugfs_init:

-- 
2.47.3


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[PATCH v6 3/9] drm/bridge: pass down IRQ_HPD to the drivers

[Dmitry Baryshkov]

The DisplayPort standard defines a special kind of HPD events called
IRQ_HPD. These events are used to notify DP Source about the events on
the Sink side. Pass down the extra status to the bridge drivers via the
hpd_notify() callback, letting DP bridges to act accordingly.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
---
 drivers/gpu/drm/bridge/lontium-lt9611uxc.c     | 3 ++-
 drivers/gpu/drm/display/drm_bridge_connector.c | 2 +-
 drivers/gpu/drm/meson/meson_encoder_hdmi.c     | 3 ++-
 drivers/gpu/drm/msm/dp/dp_display.c            | 3 ++-
 drivers/gpu/drm/msm/dp/dp_drm.h                | 3 ++-
 drivers/gpu/drm/omapdrm/dss/hdmi4.c            | 3 ++-
 include/drm/drm_bridge.h                       | 3 ++-
 7 files changed, 13 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/bridge/lontium-lt9611uxc.c b/drivers/gpu/drm/bridge/lontium-lt9611uxc.c
index b3bb7f2cebb3..b1ffbab89a16 100644
--- a/drivers/gpu/drm/bridge/lontium-lt9611uxc.c
+++ b/drivers/gpu/drm/bridge/lontium-lt9611uxc.c
@@ -429,7 +429,8 @@ static const struct drm_edid *lt9611uxc_bridge_edid_read(struct drm_bridge *brid
 
 static void lt9611uxc_bridge_hpd_notify(struct drm_bridge *bridge,
 					struct drm_connector *connector,
-					enum drm_connector_status status)
+					enum drm_connector_status status,
+					enum drm_connector_dp_event event)
 {
 	const struct drm_edid *drm_edid;
 
diff --git a/drivers/gpu/drm/display/drm_bridge_connector.c b/drivers/gpu/drm/display/drm_bridge_connector.c
index 898273f60cf6..1b0a1a00d8eb 100644
--- a/drivers/gpu/drm/display/drm_bridge_connector.c
+++ b/drivers/gpu/drm/display/drm_bridge_connector.c
@@ -151,7 +151,7 @@ static void drm_bridge_connector_hpd_notify(struct drm_connector *connector,
 	/* Notify all bridges in the pipeline of hotplug events. */
 	drm_for_each_bridge_in_chain(bridge_connector->encoder, bridge) {
 		if (bridge->funcs->hpd_notify)
-			bridge->funcs->hpd_notify(bridge, connector, status);
+			bridge->funcs->hpd_notify(bridge, connector, status, event);
 	}
 }
 
diff --git a/drivers/gpu/drm/meson/meson_encoder_hdmi.c b/drivers/gpu/drm/meson/meson_encoder_hdmi.c
index c4355c5cc340..a637613ae2e1 100644
--- a/drivers/gpu/drm/meson/meson_encoder_hdmi.c
+++ b/drivers/gpu/drm/meson/meson_encoder_hdmi.c
@@ -323,7 +323,8 @@ static int meson_encoder_hdmi_atomic_check(struct drm_bridge *bridge,
 
 static void meson_encoder_hdmi_hpd_notify(struct drm_bridge *bridge,
 					  struct drm_connector *connector,
-					  enum drm_connector_status status)
+					  enum drm_connector_status status,
+					  enum drm_connector_dp_event event)
 {
 	struct meson_encoder_hdmi *encoder_hdmi = bridge_to_meson_encoder_hdmi(bridge);
 
diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
index 6abe30bdff12..fa8942922b53 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -1541,7 +1541,8 @@ void msm_dp_bridge_hpd_disable(struct drm_bridge *bridge)
 
 void msm_dp_bridge_hpd_notify(struct drm_bridge *bridge,
 			      struct drm_connector *connector,
-			      enum drm_connector_status status)
+			      enum drm_connector_status status,
+			      enum drm_connector_dp_event event)
 {
 	struct msm_dp_bridge *msm_dp_bridge = to_dp_bridge(bridge);
 	struct msm_dp *msm_dp_display = msm_dp_bridge->msm_dp_display;
diff --git a/drivers/gpu/drm/msm/dp/dp_drm.h b/drivers/gpu/drm/msm/dp/dp_drm.h
index da412c788503..8f2f4201da60 100644
--- a/drivers/gpu/drm/msm/dp/dp_drm.h
+++ b/drivers/gpu/drm/msm/dp/dp_drm.h
@@ -31,6 +31,7 @@ void msm_dp_bridge_hpd_enable(struct drm_bridge *bridge);
 void msm_dp_bridge_hpd_disable(struct drm_bridge *bridge);
 void msm_dp_bridge_hpd_notify(struct drm_bridge *bridge,
 			      struct drm_connector *connector,
-			      enum drm_connector_status status);
+			      enum drm_connector_status status,
+			      enum drm_connector_dp_event event);
 
 #endif /* _DP_DRM_H_ */
diff --git a/drivers/gpu/drm/omapdrm/dss/hdmi4.c b/drivers/gpu/drm/omapdrm/dss/hdmi4.c
index bd6c4d2dcdc8..72972a6fe989 100644
--- a/drivers/gpu/drm/omapdrm/dss/hdmi4.c
+++ b/drivers/gpu/drm/omapdrm/dss/hdmi4.c
@@ -429,7 +429,8 @@ static void hdmi4_bridge_disable(struct drm_bridge *bridge,
 
 static void hdmi4_bridge_hpd_notify(struct drm_bridge *bridge,
 				    struct drm_connector *connector,
-				    enum drm_connector_status status)
+				    enum drm_connector_status status,
+				    enum drm_connector_dp_event event)
 {
 	struct omap_hdmi *hdmi = drm_bridge_to_hdmi(bridge);
 
diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h
index 1981d24a700d..6382ef5f1ea2 100644
--- a/include/drm/drm_bridge.h
+++ b/include/drm/drm_bridge.h
@@ -509,7 +509,8 @@ struct drm_bridge_funcs {
 	 */
 	void (*hpd_notify)(struct drm_bridge *bridge,
 			   struct drm_connector *connector,
-			   enum drm_connector_status status);
+			   enum drm_connector_status status,
+			   enum drm_connector_dp_event event);
 
 	/**
 	 * @hpd_enable:

-- 
2.47.3


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[PATCH v6 4/9] drm/bridge: pass extra events to the HPD callback

[Dmitry Baryshkov]

The DisplayPort standard defines a special kind of HPD events called
IRQ_HPD. These events are used to notify DP Source about the events on
the Sink side.

Bridge drivers report these events through the
drm_bridge_hpd_notify_extra(). Pass down the extra status to the HPD
callback, specified during the drm_bridge_hpd_enable(), letting
underlying drivers (e.g. drm_bridge_connector) to receive these events.

Acked-by: Francesco Dolcini <francesco.dolcini@toradex.com> # lt8912b
Reviewed-by: Pengyu Luo <mitltlatltl@gmail.com>
Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
---
 drivers/gpu/drm/bridge/chrontel-ch7033.c       |  3 ++-
 drivers/gpu/drm/bridge/lontium-lt8912b.c       |  3 ++-
 drivers/gpu/drm/bridge/ti-tfp410.c             |  3 ++-
 drivers/gpu/drm/display/drm_bridge_connector.c |  5 +++--
 drivers/gpu/drm/drm_bridge.c                   | 20 ++++++++++--------
 drivers/gpu/drm/omapdrm/dss/hdmi5.c            |  3 ++-
 include/drm/drm_bridge.h                       | 28 ++++++++++++++++++++++----
 7 files changed, 47 insertions(+), 18 deletions(-)

diff --git a/drivers/gpu/drm/bridge/chrontel-ch7033.c b/drivers/gpu/drm/bridge/chrontel-ch7033.c
index 4bc64b2885f7..deb5d510a616 100644
--- a/drivers/gpu/drm/bridge/chrontel-ch7033.c
+++ b/drivers/gpu/drm/bridge/chrontel-ch7033.c
@@ -258,7 +258,8 @@ static const struct drm_connector_helper_funcs ch7033_connector_helper_funcs = {
 	.best_encoder = ch7033_connector_best_encoder,
 };
 
-static void ch7033_hpd_event(void *arg, enum drm_connector_status status)
+static void ch7033_hpd_event(void *arg, enum drm_connector_status status,
+			     enum drm_connector_dp_event event)
 {
 	struct ch7033_priv *priv = arg;
 
diff --git a/drivers/gpu/drm/bridge/lontium-lt8912b.c b/drivers/gpu/drm/bridge/lontium-lt8912b.c
index e347d04b7b2d..82f5232b4205 100644
--- a/drivers/gpu/drm/bridge/lontium-lt8912b.c
+++ b/drivers/gpu/drm/bridge/lontium-lt8912b.c
@@ -506,7 +506,8 @@ static int lt8912_attach_dsi(struct lt8912 *lt)
 	return 0;
 }
 
-static void lt8912_bridge_hpd_cb(void *data, enum drm_connector_status status)
+static void lt8912_bridge_hpd_cb(void *data, enum drm_connector_status status,
+				 enum drm_connector_dp_event event)
 {
 	struct lt8912 *lt = data;
 
diff --git a/drivers/gpu/drm/bridge/ti-tfp410.c b/drivers/gpu/drm/bridge/ti-tfp410.c
index 629ff7095e87..03dbb449e0a7 100644
--- a/drivers/gpu/drm/bridge/ti-tfp410.c
+++ b/drivers/gpu/drm/bridge/ti-tfp410.c
@@ -110,7 +110,8 @@ static void tfp410_hpd_work_func(struct work_struct *work)
 		drm_helper_hpd_irq_event(dvi->bridge.dev);
 }
 
-static void tfp410_hpd_callback(void *arg, enum drm_connector_status status)
+static void tfp410_hpd_callback(void *arg, enum drm_connector_status status,
+				enum drm_connector_dp_event event)
 {
 	struct tfp410 *dvi = arg;
 
diff --git a/drivers/gpu/drm/display/drm_bridge_connector.c b/drivers/gpu/drm/display/drm_bridge_connector.c
index 1b0a1a00d8eb..4ade63306653 100644
--- a/drivers/gpu/drm/display/drm_bridge_connector.c
+++ b/drivers/gpu/drm/display/drm_bridge_connector.c
@@ -172,9 +172,10 @@ static void drm_bridge_connector_handle_hpd(struct drm_bridge_connector *drm_bri
 }
 
 static void drm_bridge_connector_hpd_cb(void *cb_data,
-					enum drm_connector_status status)
+					enum drm_connector_status status,
+					enum drm_connector_dp_event event)
 {
-	drm_bridge_connector_handle_hpd(cb_data, status, DRM_CONNECTOR_NO_EXTRA_STATUS);
+	drm_bridge_connector_handle_hpd(cb_data, status, event);
 }
 
 static void drm_bridge_connector_oob_hotplug_event(struct drm_connector *connector,
diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c
index e7f9e6d58927..2bc54131e58b 100644
--- a/drivers/gpu/drm/drm_bridge.c
+++ b/drivers/gpu/drm/drm_bridge.c
@@ -1553,7 +1553,8 @@ EXPORT_SYMBOL_GPL(drm_bridge_edid_read);
  */
 void drm_bridge_hpd_enable(struct drm_bridge *bridge,
 			   void (*cb)(void *data,
-				      enum drm_connector_status status),
+				      enum drm_connector_status status,
+				      enum drm_connector_dp_event event),
 			   void *data)
 {
 	if (!(bridge->ops & DRM_BRIDGE_OP_HPD))
@@ -1611,25 +1612,28 @@ void drm_bridge_hpd_disable(struct drm_bridge *bridge)
 EXPORT_SYMBOL_GPL(drm_bridge_hpd_disable);
 
 /**
- * drm_bridge_hpd_notify - notify hot plug detection events
+ * drm_bridge_hpd_notify_extra - notify hot plug detection and sink IRQ events
  * @bridge: bridge control structure
  * @status: output connection status
+ * @event: additional status recorded by the sink
  *
  * Bridge drivers shall call this function to report hot plug events when they
- * detect a change in the output status, when hot plug detection has been
- * enabled by drm_bridge_hpd_enable().
+ * detect a change in the output status or when the sink has reported extra HPD
+ * status events (like the IRQ_HPD in case of the DisplayPort), when hot plug
+ * detection has been enabled by drm_bridge_hpd_enable().
  *
  * This function shall be called in a context that can sleep.
  */
-void drm_bridge_hpd_notify(struct drm_bridge *bridge,
-			   enum drm_connector_status status)
+void drm_bridge_hpd_notify_extra(struct drm_bridge *bridge,
+				 enum drm_connector_status status,
+				 enum drm_connector_dp_event event)
 {
 	mutex_lock(&bridge->hpd_mutex);
 	if (bridge->hpd_cb)
-		bridge->hpd_cb(bridge->hpd_data, status);
+		bridge->hpd_cb(bridge->hpd_data, status, event);
 	mutex_unlock(&bridge->hpd_mutex);
 }
-EXPORT_SYMBOL_GPL(drm_bridge_hpd_notify);
+EXPORT_SYMBOL_GPL(drm_bridge_hpd_notify_extra);
 
 #ifdef CONFIG_OF
 /**
diff --git a/drivers/gpu/drm/omapdrm/dss/hdmi5.c b/drivers/gpu/drm/omapdrm/dss/hdmi5.c
index c542ba6ce7d3..a21f9355594c 100644
--- a/drivers/gpu/drm/omapdrm/dss/hdmi5.c
+++ b/drivers/gpu/drm/omapdrm/dss/hdmi5.c
@@ -427,7 +427,8 @@ static void hdmi5_bridge_disable(struct drm_bridge *bridge,
 
 static void hdmi5_bridge_hpd_notify(struct drm_bridge *bridge,
 				    struct drm_connector *connector,
-				    enum drm_connector_status status)
+				    enum drm_connector_status status,
+				    enum drm_connector_dp_event event)
 {
 	struct omap_hdmi *hdmi = drm_bridge_to_hdmi(bridge);
 
diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h
index 6382ef5f1ea2..c839a6993a83 100644
--- a/include/drm/drm_bridge.h
+++ b/include/drm/drm_bridge.h
@@ -1208,7 +1208,8 @@ struct drm_bridge {
 	 * @hpd_cb: Hot plug detection callback, registered with
 	 * drm_bridge_hpd_enable().
 	 */
-	void (*hpd_cb)(void *data, enum drm_connector_status status);
+	void (*hpd_cb)(void *data, enum drm_connector_status status,
+		       enum drm_connector_dp_event event);
 	/**
 	 * @hpd_data: Private data passed to the Hot plug detection callback
 	 * @hpd_cb.
@@ -1517,11 +1518,30 @@ const struct drm_edid *drm_bridge_edid_read(struct drm_bridge *bridge,
 					    struct drm_connector *connector);
 void drm_bridge_hpd_enable(struct drm_bridge *bridge,
 			   void (*cb)(void *data,
-				      enum drm_connector_status status),
+				      enum drm_connector_status status,
+				      enum drm_connector_dp_event event),
 			   void *data);
 void drm_bridge_hpd_disable(struct drm_bridge *bridge);
-void drm_bridge_hpd_notify(struct drm_bridge *bridge,
-			   enum drm_connector_status status);
+void drm_bridge_hpd_notify_extra(struct drm_bridge *bridge,
+				 enum drm_connector_status status,
+				 enum drm_connector_dp_event event);
+
+/**
+ * drm_bridge_hpd_notify - notify hot plug detection events
+ * @bridge: bridge control structure
+ * @status: output connection status
+ *
+ * Bridge drivers shall call this function to report hot plug events when they
+ * detect a change in the output status, when hot plug detection has been
+ * enabled by drm_bridge_hpd_enable().
+ *
+ * This function shall be called in a context that can sleep.
+ */
+static inline void drm_bridge_hpd_notify(struct drm_bridge *bridge,
+					 enum drm_connector_status status)
+{
+	drm_bridge_hpd_notify_extra(bridge, status, DRM_CONNECTOR_NO_EXTRA_STATUS);
+}
 
 void drm_bridge_debugfs_params(struct dentry *root);
 void drm_bridge_debugfs_encoder_params(struct dentry *root, struct drm_encoder *encoder);

-- 
2.47.3


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[PATCH v6 5/9] drm/bridge: aux-hpd: let drivers pass IRQ_HPD events

[Dmitry Baryshkov]

The DisplayPort standard defines a special kind of HPD events called
IRQ_HPD. These events are used to notify DP Source about the events on
the Sink side.

Let users of aux-hpd, the UCSI and PMIC GLINK drivers pass the IRQ_HPD
events to the DisplayPort drivers.

The drm_aux_hpd_bridge_notify() is kept to ease merging of the series,
preventing extra cross-tree merges. It will be removed once all
drivers are converted. The drm_bridge_hpd_notify() function is kept for
the drivers which only care about the connector status and will always
pass DRM_CONNECTOR_NO_EXTRA_STATUS as the extra status.

Reviewed-by: Pengyu Luo <mitltlatltl@gmail.com>
Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
---
 drivers/gpu/drm/bridge/aux-hpd-bridge.c | 11 +++++++----
 include/drm/bridge/aux-bridge.h         | 13 +++++++++++--
 2 files changed, 18 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/bridge/aux-hpd-bridge.c b/drivers/gpu/drm/bridge/aux-hpd-bridge.c
index a2e525aa5788..930a03496ac5 100644
--- a/drivers/gpu/drm/bridge/aux-hpd-bridge.c
+++ b/drivers/gpu/drm/bridge/aux-hpd-bridge.c
@@ -137,16 +137,19 @@ struct device *drm_dp_hpd_bridge_register(struct device *parent, struct device_n
 EXPORT_SYMBOL_GPL(drm_dp_hpd_bridge_register);
 
 /**
- * drm_aux_hpd_bridge_notify - notify hot plug detection events
+ * drm_aux_hpd_bridge_notify_extra - notify hot plug detection events
  * @dev: device created for the HPD bridge
  * @status: output connection status
+ * @event: extra status bits like DRM_CONNECTOR_DP_IRQ_HPD
  *
  * A wrapper around drm_bridge_hpd_notify() that is used to report hot plug
  * detection events for bridges created via drm_dp_hpd_bridge_register().
  *
  * This function shall be called in a context that can sleep.
  */
-void drm_aux_hpd_bridge_notify(struct device *dev, enum drm_connector_status status)
+void drm_aux_hpd_bridge_notify_extra(struct device *dev,
+				     enum drm_connector_status status,
+				     enum drm_connector_dp_event event)
 {
 	struct auxiliary_device *adev = to_auxiliary_dev(dev);
 	struct drm_aux_hpd_bridge_data *data = auxiliary_get_drvdata(adev);
@@ -154,9 +157,9 @@ void drm_aux_hpd_bridge_notify(struct device *dev, enum drm_connector_status sta
 	if (!data)
 		return;
 
-	drm_bridge_hpd_notify(&data->bridge, status);
+	drm_bridge_hpd_notify_extra(&data->bridge, status, event);
 }
-EXPORT_SYMBOL_GPL(drm_aux_hpd_bridge_notify);
+EXPORT_SYMBOL_GPL(drm_aux_hpd_bridge_notify_extra);
 
 static int drm_aux_hpd_bridge_attach(struct drm_bridge *bridge,
 				     struct drm_encoder *encoder,
diff --git a/include/drm/bridge/aux-bridge.h b/include/drm/bridge/aux-bridge.h
index c2f5a855512f..233ca885736f 100644
--- a/include/drm/bridge/aux-bridge.h
+++ b/include/drm/bridge/aux-bridge.h
@@ -25,7 +25,9 @@ struct auxiliary_device *devm_drm_dp_hpd_bridge_alloc(struct device *parent, str
 int devm_drm_dp_hpd_bridge_add(struct device *dev, struct auxiliary_device *adev);
 struct device *drm_dp_hpd_bridge_register(struct device *parent,
 					  struct device_node *np);
-void drm_aux_hpd_bridge_notify(struct device *dev, enum drm_connector_status status);
+void drm_aux_hpd_bridge_notify_extra(struct device *dev,
+				     enum drm_connector_status status,
+				     enum drm_connector_dp_event event);
 #else
 static inline struct auxiliary_device *devm_drm_dp_hpd_bridge_alloc(struct device *parent,
 								    struct device_node *np)
@@ -44,9 +46,16 @@ static inline struct device *drm_dp_hpd_bridge_register(struct device *parent,
 	return NULL;
 }
 
-static inline void drm_aux_hpd_bridge_notify(struct device *dev, enum drm_connector_status status)
+static inline void drm_aux_hpd_bridge_notify_extra(struct device *dev,
+						   enum drm_connector_status status,
+						   enum drm_connector_dp_event event)
 {
 }
 #endif
 
+static inline void drm_aux_hpd_bridge_notify(struct device *dev, enum drm_connector_status status)
+{
+	drm_aux_hpd_bridge_notify_extra(dev, status, DRM_CONNECTOR_NO_EXTRA_STATUS);
+}
+
 #endif

-- 
2.47.3


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[PATCH v6 6/9] drm/msm/dp: don't take extra references on multiple plug events

[Dmitry Baryshkov]

The upper layers might signal multiple sequential HPD plug events. Don't
take extra references and skip all further HPD plug events until we
receive the unplug event.

Fixes: 3ea2d1c3d154 ("drm/msm/dp: turn link_ready into plugged")
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
---
 drivers/gpu/drm/msm/dp/dp_display.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
index fa8942922b53..ce919a26fba2 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -412,6 +412,9 @@ static int msm_dp_hpd_plug_handle(struct msm_dp_display_private *dp)
 
 	guard(mutex)(&dp->plugged_lock);
 
+	if (dp->plugged)
+		return 0;
+
 	ret = pm_runtime_resume_and_get(&pdev->dev);
 	if (ret) {
 		DRM_ERROR("failed to pm_runtime_resume\n");

-- 
2.47.3


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[PATCH v6 7/9] drm/msm: dp: handle the IRQ_HPD events reported by USB-C

[Dmitry Baryshkov]

The DisplayPort standard defines a special kind of HPD events called
IRQ_HPD. These events are used to notify DP Source about the events on
the Sink side, for example DP MST events.

Let the MSM DisplayPort driver properly track and handle IRQ_HPD
delivered over the OOB events (e.g. from the USB-C AltMode handler).

Reviewed-by: Pengyu Luo <mitltlatltl@gmail.com>
Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
---
 drivers/gpu/drm/msm/dp/dp_display.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
index ce919a26fba2..6a8b3b8e1fe7 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -1566,11 +1566,13 @@ void msm_dp_bridge_hpd_notify(struct drm_bridge *bridge,
 		if (hpd_link_status == ISR_HPD_REPLUG_COUNT) {
 			msm_dp_hpd_unplug_handle(dp);
 			msm_dp_hpd_plug_handle(dp);
-		} else if (hpd_link_status == ISR_IRQ_HPD_PULSE_COUNT) {
-			msm_dp_irq_hpd_handle(dp);
 		} else {
 			msm_dp_hpd_plug_handle(dp);
 		}
+
+		if (hpd_link_status == ISR_IRQ_HPD_PULSE_COUNT ||
+		    event == DRM_CONNECTOR_DP_IRQ_HPD) {
+			msm_dp_irq_hpd_handle(dp);
 	} else {
 		msm_dp_hpd_unplug_handle(dp);
 	}

-- 
2.47.3


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[PATCH v6 8/9] soc: qcom: pmic-glink-altmode: pass down HPD_IRQ events

[Dmitry Baryshkov]

The DisplayPort standard defines a special kind of HPD events called
IRQ_HPD. These events are used to notify DP Source about the events on
the Sink side.

Pass IRQ_HPD events from the firmware to the HPD bridge, letting those
to be delivered to the DisplayPort driver.

Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Acked-by: Bjorn Andersson <andersson@kernel.org>
Reviewed-by: Pengyu Luo <mitltlatltl@gmail.com>
Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
---
 drivers/soc/qcom/pmic_glink_altmode.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/soc/qcom/pmic_glink_altmode.c b/drivers/soc/qcom/pmic_glink_altmode.c
index 13c434f8d03a..c463b23c99d3 100644
--- a/drivers/soc/qcom/pmic_glink_altmode.c
+++ b/drivers/soc/qcom/pmic_glink_altmode.c
@@ -374,7 +374,11 @@ static void pmic_glink_altmode_worker(struct work_struct *work)
 		else
 			conn_status = connector_status_disconnected;
 
-		drm_aux_hpd_bridge_notify(&alt_port->bridge->dev, conn_status);
+		drm_aux_hpd_bridge_notify_extra(&alt_port->bridge->dev,
+						conn_status,
+						alt_port->hpd_irq ?
+						DRM_CONNECTOR_DP_IRQ_HPD :
+						DRM_CONNECTOR_NO_EXTRA_STATUS);
 	} else if (alt_port->mux_ctrl == MUX_CTRL_STATE_TUNNELING) {
 		if (alt_port->svid == USB_TYPEC_TBT_SID)
 			pmic_glink_altmode_enable_tbt(altmode, alt_port);

-- 
2.47.3


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[PATCH v6 9/9] usb: typec: ucsi: huawei-gaokun: pass down HPD_IRQ events

[Dmitry Baryshkov]

The DisplayPort standard defines a special kind of HPD events called
IRQ_HPD. These events are used to notify DP Source about the events on
the Sink side.

Pass IRQ_HPD events from the EC to the HPD bridge, letting those
to be delivered to the DisplayPort driver.

Reviewed-by: Pengyu Luo <mitltlatltl@gmail.com>
Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
---
 drivers/usb/typec/ucsi/ucsi_huawei_gaokun.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/usb/typec/ucsi/ucsi_huawei_gaokun.c b/drivers/usb/typec/ucsi/ucsi_huawei_gaokun.c
index 57b37fca150c..cb0312e2b8dc 100644
--- a/drivers/usb/typec/ucsi/ucsi_huawei_gaokun.c
+++ b/drivers/usb/typec/ucsi/ucsi_huawei_gaokun.c
@@ -316,10 +316,13 @@ static void gaokun_ucsi_handle_usb_mode(struct gaokun_ucsi_port *port)
 
 	/* UCSI callback .connector_status() have set orientation */
 	if (port->bridge && port->svid == USB_TYPEC_DP_SID)
-		drm_aux_hpd_bridge_notify(&port->bridge->dev,
-					  port->hpd_state ?
-					  connector_status_connected :
-					  connector_status_disconnected);
+		drm_aux_hpd_bridge_notify_extra(&port->bridge->dev,
+						port->hpd_state ?
+						connector_status_connected :
+						connector_status_disconnected,
+						port->hpd_irq ?
+						DRM_CONNECTOR_DP_IRQ_HPD :
+						DRM_CONNECTOR_NO_EXTRA_STATUS);
 
 	gaokun_ec_ucsi_pan_ack(uec->ec, port->idx);
 }

-- 
2.47.3


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Re: [PATCH v6 7/9] drm/msm: dp: handle the IRQ_HPD events reported by USB-C

[sashiko-bot]

Thank you for your contribution! Sashiko AI review found 1 potential issue(s) to consider:
- [High] drm/msm/dp: missing closing brace in msm_dp_bridge_hpd_notify()
--

commit 42034f570d120654d6aa4e06b9c582eb06cb2f5f
Author: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>

drm/msm: dp: handle the IRQ_HPD events reported by USB-C

This commit updates msm_dp_bridge_hpd_notify() to handle out-of-band
DRM_CONNECTOR_DP_IRQ_HPD events in addition to ISR_IRQ_HPD_PULSE_COUNT
link status pulses.

> diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
> index ce919a26fba28..6a8b3b8e1fe7f 100644
> --- a/drivers/gpu/drm/msm/dp/dp_display.c
> +++ b/drivers/gpu/drm/msm/dp/dp_display.c
> @@ -1566,11 +1566,13 @@ void msm_dp_bridge_hpd_notify(struct drm_bridge *bridge,
>  		if (hpd_link_status == ISR_HPD_REPLUG_COUNT) {
>  			msm_dp_hpd_unplug_handle(dp);
>  			msm_dp_hpd_plug_handle(dp);
> -		} else if (hpd_link_status == ISR_IRQ_HPD_PULSE_COUNT) {
> -			msm_dp_irq_hpd_handle(dp);
>  		} else {
>  			msm_dp_hpd_plug_handle(dp);
>  		}
> +
> +		if (hpd_link_status == ISR_IRQ_HPD_PULSE_COUNT ||
> +		    event == DRM_CONNECTOR_DP_IRQ_HPD) {
> +			msm_dp_irq_hpd_handle(dp);
>  	} else {
>  		msm_dp_hpd_unplug_handle(dp);
>  	}

[Severity: High]
Is a closing brace missing for the new if statement in
msm_dp_bridge_hpd_notify() in drivers/gpu/drm/msm/dp/dp_display.c?

The check for ISR_IRQ_HPD_PULSE_COUNT or DRM_CONNECTOR_DP_IRQ_HPD opens a
block with a brace before calling msm_dp_irq_hpd_handle(dp), but does not
close it before the following else branch:

	if (status == connector_status_connected) {
		...
		if (hpd_link_status == ISR_IRQ_HPD_PULSE_COUNT ||
		    event == DRM_CONNECTOR_DP_IRQ_HPD) {
			msm_dp_irq_hpd_handle(dp);
	} else {
		msm_dp_hpd_unplug_handle(dp);
	}

Because the block is not closed, the else branch pairs with the inner
if statement instead of the outer status == connector_status_connected check,
and the function body of msm_dp_bridge_hpd_notify() remains unclosed at the
end of the file, causing a build failure.

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20261022-hpd-irq-events-v6-0-337ea3ddaa62@oss.qualcomm.com?part=7

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Re: [PATCH v6 3/9] drm/bridge: pass down IRQ_HPD to the drivers

[sashiko-bot]

Thank you for your contribution! Sashiko AI review found 1 potential issue(s) to consider:
- [Low] drm/omap: unupdated hpd_notify() signature in hdmi5_bridge_hpd_notify()
--

commit 9cf55ff0f96b440ba05665e3db9e82c5372fd640
Author: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>

drm/bridge: pass down IRQ_HPD to the drivers

This commit adds an enum drm_connector_dp_event parameter to the
drm_bridge_funcs.hpd_notify callback and updates its callers and bridge
implementations so DisplayPort bridges can handle IRQ_HPD events.

[ ... ]

> diff --git a/drivers/gpu/drm/omapdrm/dss/hdmi4.c b/drivers/gpu/drm/omapdrm/dss/hdmi4.c
> index bd6c4d2dcdc86..72972a6fe989b 100644
> --- a/drivers/gpu/drm/omapdrm/dss/hdmi4.c
> +++ b/drivers/gpu/drm/omapdrm/dss/hdmi4.c
> @@ -429,7 +429,8 @@ static void hdmi4_bridge_disable(struct drm_bridge *bridge,
>  
>  static void hdmi4_bridge_hpd_notify(struct drm_bridge *bridge,
>  				    struct drm_connector *connector,
> -				    enum drm_connector_status status)
> +				    enum drm_connector_status status,
> +				    enum drm_connector_dp_event event)
>  {
>  	struct omap_hdmi *hdmi = drm_bridge_to_hdmi(bridge);
>  
> diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h
> index 1981d24a700d2..6382ef5f1ea28 100644
> --- a/include/drm/drm_bridge.h
> +++ b/include/drm/drm_bridge.h
> @@ -509,7 +509,8 @@ struct drm_bridge_funcs {
>  	 */
>  	void (*hpd_notify)(struct drm_bridge *bridge,
>  			   struct drm_connector *connector,
> -			   enum drm_connector_status status);
> +			   enum drm_connector_status status,
> +			   enum drm_connector_dp_event event);
>  
>  	/**
>  	 * @hpd_enable:

[Severity: Low]
While hdmi4_bridge_hpd_notify() in drivers/gpu/drm/omapdrm/dss/hdmi4.c is
updated here, it looks like hdmi5_bridge_hpd_notify() in
drivers/gpu/drm/omapdrm/dss/hdmi5.c still has the old 3-argument signature:

static void hdmi5_bridge_hpd_notify(struct drm_bridge *bridge,
				    struct drm_connector *connector,
				    enum drm_connector_status status)
{
	struct omap_hdmi *hdmi = drm_bridge_to_hdmi(bridge);

	hdmi_audio_hpd_notify(hdmi, status);
}
...
static const struct drm_bridge_funcs hdmi5_bridge_funcs = {
	...
	.hpd_notify = hdmi5_bridge_hpd_notify,
	.edid_read = hdmi5_bridge_edid_read,
};

Should hdmi5_bridge_hpd_notify() also be updated to accept enum
drm_connector_dp_event event so that builds with CONFIG_OMAP5_DSS_HDMI
enabled do not fail with an incompatible function pointer type error?

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20261022-hpd-irq-events-v6-0-337ea3ddaa62@oss.qualcomm.com?part=3

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Re: [PATCH v6 4/9] drm/bridge: pass extra events to the HPD callback

[sashiko-bot]

Thank you for your contribution! Sashiko AI review found 1 potential issue(s) to consider:
- [Low] drm/bridge: misplaced hdmi5_bridge_hpd_notify() hunk breaks bisectability
--

commit c6cd0e6e9f3efd88f40aba30dc7463e072351c53
Author: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>

drm/bridge: pass extra events to the HPD callback

This commit adds drm_bridge_hpd_notify_extra() and updates the HPD callback
signature registered via drm_bridge_hpd_enable() to pass extra sink events
such as DisplayPort IRQ_HPD to underlying drivers.

[ ... ]

> diff --git a/drivers/gpu/drm/omapdrm/dss/hdmi5.c b/drivers/gpu/drm/omapdrm/dss/hdmi5.c
> index c542ba6ce7d32..a21f9355594cc 100644
> --- a/drivers/gpu/drm/omapdrm/dss/hdmi5.c
> +++ b/drivers/gpu/drm/omapdrm/dss/hdmi5.c
> @@ -427,7 +427,8 @@ static void hdmi5_bridge_disable(struct drm_bridge *bridge,
>  
>  static void hdmi5_bridge_hpd_notify(struct drm_bridge *bridge,
>  				    struct drm_connector *connector,
> -				    enum drm_connector_status status)
> +				    enum drm_connector_status status,
> +				    enum drm_connector_dp_event event)
>  {
>  	struct omap_hdmi *hdmi = drm_bridge_to_hdmi(bridge);
>  

[Severity: Low]
In drivers/gpu/drm/omapdrm/dss/hdmi5.c, hdmi5_bridge_hpd_notify() is assigned
to struct drm_bridge_funcs.hpd_notify rather than registered via
drm_bridge_hpd_enable():

static const struct drm_bridge_funcs hdmi5_bridge_funcs = {
	...
	.hpd_notify = hdmi5_bridge_hpd_notify,
	.edid_read = hdmi5_bridge_edid_read,
};

The hpd_notify callback signature in struct drm_bridge_funcs (in
include/drm/drm_bridge.h) and the other in-tree implementations (including
hdmi4_bridge_hpd_notify() in drivers/gpu/drm/omapdrm/dss/hdmi4.c) were
updated in parent commit 9cf55ff0f96b ("drm/bridge: pass down IRQ_HPD to the
drivers").

Because the hdmi5_bridge_hpd_notify() update landed in this patch instead,
building the kernel at commit 9cf55ff0f96b with CONFIG_DRM_OMAP and
CONFIG_OMAP5_DSS_HDMI enabled fails with an incompatible function pointer type
error when initializing hdmi5_bridge_funcs.hpd_notify.

Should this hunk be moved into commit 9cf55ff0f96b ("drm/bridge: pass down
IRQ_HPD to the drivers") to preserve bisectability?

[ ... ]

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20261022-hpd-irq-events-v6-0-337ea3ddaa62@oss.qualcomm.com?part=4

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Re: [PATCH v6 9/9] usb: typec: ucsi: huawei-gaokun: pass down HPD_IRQ events

[sashiko-bot]

Thank you for your contribution! Sashiko AI review found 2 potential issue(s) to consider:
- [High] drm/msm/dp: missing closing brace in msm_dp_bridge_hpd_notify()
- [High] drm/msm/dp: msm_dp_hpd_plug_handle() skips HPD high processing after detect
--

commit 42034f570d120654d6aa4e06b9c582eb06cb2f5f
Author: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>

drm/msm: dp: handle the IRQ_HPD events reported by USB-C

This commit updates msm_dp_bridge_hpd_notify() in the msm DisplayPort driver
to handle DRM_CONNECTOR_DP_IRQ_HPD events reported via out-of-band
notifications.

> diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
> index ce919a26fba28..6a8b3b8e1fe7f 100644
> --- a/drivers/gpu/drm/msm/dp/dp_display.c
> +++ b/drivers/gpu/drm/msm/dp/dp_display.c
> @@ -1566,11 +1566,13 @@ void msm_dp_bridge_hpd_notify(struct drm_bridge *bridge,
>  		if (hpd_link_status == ISR_HPD_REPLUG_COUNT) {
>  			msm_dp_hpd_unplug_handle(dp);
>  			msm_dp_hpd_plug_handle(dp);
> -		} else if (hpd_link_status == ISR_IRQ_HPD_PULSE_COUNT) {
> -			msm_dp_irq_hpd_handle(dp);
>  		} else {
>  			msm_dp_hpd_plug_handle(dp);
>  		}
> +
> +		if (hpd_link_status == ISR_IRQ_HPD_PULSE_COUNT ||
> +		    event == DRM_CONNECTOR_DP_IRQ_HPD) {
> +			msm_dp_irq_hpd_handle(dp);
>  	} else {
>  		msm_dp_hpd_unplug_handle(dp);
>  	}

[Severity: High]
Is there a missing closing brace for the inner if statement in
msm_dp_bridge_hpd_notify() in drivers/gpu/drm/msm/dp/dp_display.c?

The opening brace after checking ISR_IRQ_HPD_PULSE_COUNT and
DRM_CONNECTOR_DP_IRQ_HPD is never closed before the else branch:

	if (status == connector_status_connected) {
		...
		if (hpd_link_status == ISR_IRQ_HPD_PULSE_COUNT ||
		    event == DRM_CONNECTOR_DP_IRQ_HPD) {
			msm_dp_irq_hpd_handle(dp);
	} else {
		msm_dp_hpd_unplug_handle(dp);
	}

This leaves the outer if block unclosed, causing a build failure at the end
of drivers/gpu/drm/msm/dp/dp_display.c as well as pairing the
msm_dp_hpd_unplug_handle(dp) else branch with the inner check instead of
status == connector_status_connected.


commit 1182d7f2f2e876c63dd6756de1f85227702b93b4
Author: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>

drm/msm/dp: don't take extra references on multiple plug events

This commit adds an early return in msm_dp_hpd_plug_handle() when
dp->plugged is already set so sequential plug events do not take extra
runtime power management references.

> diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
> index fa8942922b533..ce919a26fba28 100644
> --- a/drivers/gpu/drm/msm/dp/dp_display.c
> +++ b/drivers/gpu/drm/msm/dp/dp_display.c
> @@ -412,6 +412,9 @@ static int msm_dp_hpd_plug_handle(struct msm_dp_display_private *dp)
>  
>  	guard(mutex)(&dp->plugged_lock);
>  
> +	if (dp->plugged)
> +		return 0;
> +
>  	ret = pm_runtime_resume_and_get(&pdev->dev);
>  	if (ret) {
>  		DRM_ERROR("failed to pm_runtime_resume\n");

[Severity: High]
Will returning early when dp->plugged is true in msm_dp_hpd_plug_handle()
cause msm_dp_display_process_hpd_high() to be skipped after connector
detection?

During connector probing in
drivers/gpu/drm/display/drm_bridge_connector.c:drm_bridge_connector_detect_ctx(),
detect->funcs->detect() is called before drm_bridge_connector_hpd_notify():

	if (detect) {
		status = detect->funcs->detect(detect, connector);
		...
		drm_bridge_connector_hpd_notify(connector, status,
						DRM_CONNECTOR_NO_EXTRA_STATUS);
	}

When detect->funcs->detect() runs msm_dp_bridge_detect() in
drivers/gpu/drm/msm/dp/dp_display.c, it reads the receiver capabilities and
sets priv->plugged = true without calling msm_dp_display_process_hpd_high():

	ret = drm_dp_read_desc(priv->aux, &desc, drm_dp_is_branch(dpcd));
	if (ret) {
		DRM_DEBUG_DP("failed to read desc\n");
		priv->plugged = false;
		goto end;
	}

	status = connector_status_connected;
	priv->plugged = true;

When drm_bridge_connector_hpd_notify() -> msm_dp_bridge_hpd_notify() ->
msm_dp_hpd_plug_handle() then runs (or when a subsequent plug notification
arrives), dp->plugged is already true, so msm_dp_hpd_plug_handle() returns 0
immediately without calling msm_dp_display_process_hpd_high().

Without msm_dp_display_process_hpd_high(), drm_edid_connector_update() is
not called, dp->panel link parameters remain uninitialized, and
dp->link->sink_count stays 0, causing link preparation to fail with
-ENOTCONN.

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20261022-hpd-irq-events-v6-0-337ea3ddaa62@oss.qualcomm.com?part=9

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Re: [PATCH v6 6/9] drm/msm/dp: don't take extra references on multiple plug events

[sashiko-bot]

Thank you for your contribution! Sashiko AI review found 2 potential issue(s) to consider:
- [High] drm/msm/dp: skipped HPD high processing in msm_dp_hpd_plug_handle()
- [Medium] drm/msm/dp: runtime PM reference leak in msm_dp_bridge_detect()
--

commit 1182d7f2f2e876c63dd6756de1f85227702b93b4
Author: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>

drm/msm/dp: don't take extra references on multiple plug events

This commit skips subsequent HPD plug events in msm_dp_hpd_plug_handle() when
dp->plugged is already set so that extra runtime PM references are not taken
before an unplug event arrives.

> diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
> index fa8942922b533..ce919a26fba28 100644
> --- a/drivers/gpu/drm/msm/dp/dp_display.c
> +++ b/drivers/gpu/drm/msm/dp/dp_display.c
> @@ -412,6 +412,9 @@ static int msm_dp_hpd_plug_handle(struct msm_dp_display_private *dp)
>  
>  	guard(mutex)(&dp->plugged_lock);
>  
> +	if (dp->plugged)
> +		return 0;

[Severity: High]
Can returning early here when dp->plugged is true cause
msm_dp_display_process_hpd_high() to be skipped completely when a display is
connected?

In drivers/gpu/drm/display/drm_bridge_connector.c,
drm_bridge_connector_detect_ctx() invokes the bridge detect callback before
notifying HPD:

drm_bridge_connector_detect_ctx()
    detect->funcs->detect() -> msm_dp_bridge_detect()
    drm_bridge_connector_hpd_notify()
        -> msm_dp_bridge_hpd_notify()
        -> msm_dp_hpd_plug_handle()

When msm_dp_bridge_detect() in drivers/gpu/drm/msm/dp/dp_display.c runs
first (for instance at boot or resume when a monitor is already connected, or
during connector probing before the threaded HPD IRQ runs), it reads the DPCD
capabilities into a local buffer and sets priv->plugged = true without
calling msm_dp_display_process_hpd_high():

drivers/gpu/drm/msm/dp/dp_display.c:msm_dp_bridge_detect() {
    ...
	status = connector_status_connected;
	priv->plugged = true;
    ...
}

When msm_dp_hpd_plug_handle() is then called, it sees dp->plugged == true and
returns 0 immediately.

Similarly, if msm_dp_hpd_plug_handle() runs first and
msm_dp_display_process_hpd_high() returns an error (such as when a branch
device is connected with sink_count == 0 or on a transient AUX error),
msm_dp_hpd_plug_handle() still sets dp->plugged = true at the end of the
function:

drivers/gpu/drm/msm/dp/dp_display.c:msm_dp_hpd_plug_handle() {
    ...
	ret = msm_dp_display_process_hpd_high(dp);

	drm_dbg_dp(dp->drm_dev, "After, type=%d sink_count=%d\n",
			dp->msm_dp_display.connector_type,
			dp->link->sink_count);

	dp->plugged = true;

	return ret;
}

Because msm_dp_display_process_hpd_high() is never completed in either case,
will dp->panel->link_info, LTTPR state, the connector EDID, and
dp->link->sink_count remain uninitialized?

[Severity: Medium]
How does this single-reference model in msm_dp_hpd_plug_handle() interact
with the runtime PM reference handling in msm_dp_bridge_detect()?

In drivers/gpu/drm/msm/dp/dp_display.c, msm_dp_bridge_detect()
unconditionally acquires a runtime PM reference on &dp->pdev->dev at entry
and only releases it at the end if !priv->plugged:

drivers/gpu/drm/msm/dp/dp_display.c:msm_dp_bridge_detect() {
	guard(mutex)(&priv->plugged_lock);
	ret = pm_runtime_resume_and_get(&dp->pdev->dev);
	if (ret) {
		DRM_ERROR("failed to pm_runtime_resume\n");
		return status;
	}
    ...
	status = connector_status_connected;
	priv->plugged = true;
    ...
end:
	if (!priv->plugged) {
		if (phy_deinit) {
			msm_dp_aux_enable_xfers(priv->aux, false);
			msm_dp_display_host_phy_exit(priv);
		}

		pm_runtime_put_sync(&dp->pdev->dev);
	}

	return status;
}

When a sink is connected and priv->plugged is already true, won't every call
to msm_dp_bridge_detect() leak an extra runtime PM reference on
&dp->pdev->dev because msm_dp_hpd_unplug_handle() only calls
pm_runtime_put_sync(&pdev->dev) once when transitioning dp->plugged from true
to false?

Conversely, if priv->plugged is true (holding a reference from
msm_dp_hpd_plug_handle()) and drm_dp_read_dpcd_caps() or drm_dp_read_desc()
fails inside msm_dp_bridge_detect(), msm_dp_bridge_detect() sets
priv->plugged = false and only drops the reference it took at entry, causing
msm_dp_hpd_unplug_handle() to return early on !dp->plugged without releasing
the reference acquired by msm_dp_hpd_plug_handle().

> +
>  	ret = pm_runtime_resume_and_get(&pdev->dev);
>  	if (ret) {
>  		DRM_ERROR("failed to pm_runtime_resume\n");

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20261022-hpd-irq-events-v6-0-337ea3ddaa62@oss.qualcomm.com?part=6

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