linux-kernel - [PATCH v3 5/8] drm/msm/dp: Drop EV_USER

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Message-Id: <20260115-hpd-refactor-v3-5-08e2f3bcd2e0@oss.qualcomm.com>
Date: Thu, 15 Jan 2026 09:29:10 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Rob Clark <robin.clark@....qualcomm.com>,
        Dmitry Baryshkov <lumag@...nel.org>,
        Abhinav Kumar <abhinav.kumar@...ux.dev>,
        Jessica Zhang <jesszhan0024@...il.com>, Sean Paul <sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
        Kuogee Hsieh <quic_khsieh@...cinc.com>
Cc: linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Jessica Zhang <jessica.zhang@....qualcomm.com>
Subject: [PATCH v3 5/8] drm/msm/dp: Drop EV_USER_NOTIFICATION

From: Jessica Zhang <jessica.zhang@....qualcomm.com>

Currently, we queue an event for signalling HPD connect/disconnect. This
can mean a delay in plug/unplug handling and notifying DRM core when a
hotplug happens.

Drop EV_USER_NOTIFICATION and signal the IRQ event as part of hotplug
handling.

Signed-off-by: Jessica Zhang <jessica.zhang@....qualcomm.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
---
 drivers/gpu/drm/msm/dp/dp_display.c | 28 ++++++++--------------------
 drivers/gpu/drm/msm/dp/dp_display.h |  1 +
 drivers/gpu/drm/msm/dp/dp_drm.c     |  2 ++
 3 files changed, 11 insertions(+), 20 deletions(-)

diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
index 3184066adb15..e0b424ac861a 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -58,7 +58,6 @@ enum {
 	EV_HPD_PLUG_INT,
 	EV_IRQ_HPD_INT,
 	EV_HPD_UNPLUG_INT,
-	EV_USER_NOTIFICATION,
 };
 
 #define EVENT_TIMEOUT	(HZ/10)	/* 100ms */
@@ -343,17 +342,6 @@ static const struct component_ops msm_dp_display_comp_ops = {
 	.unbind = msm_dp_display_unbind,
 };
 
-static void msm_dp_display_send_hpd_event(struct msm_dp *msm_dp_display)
-{
-	struct msm_dp_display_private *dp;
-	struct drm_connector *connector;
-
-	dp = container_of(msm_dp_display, struct msm_dp_display_private, msm_dp_display);
-
-	connector = dp->msm_dp_display.connector;
-	drm_helper_hpd_irq_event(connector->dev);
-}
-
 static int msm_dp_display_send_hpd_notification(struct msm_dp_display_private *dp,
 					    bool hpd)
 {
@@ -377,7 +365,11 @@ static int msm_dp_display_send_hpd_notification(struct msm_dp_display_private *d
 
 	drm_dbg_dp(dp->drm_dev, "type=%d hpd=%d\n",
 			dp->msm_dp_display.connector_type, hpd);
-	msm_dp_display_send_hpd_event(&dp->msm_dp_display);
+
+	drm_bridge_hpd_notify(dp->msm_dp_display.bridge,
+			      hpd ?
+			      connector_status_connected :
+			      connector_status_disconnected);
 
 	return 0;
 }
@@ -437,7 +429,7 @@ static int msm_dp_display_process_hpd_high(struct msm_dp_display_private *dp)
 
 	msm_dp_link_reset_phy_params_vx_px(dp->link);
 
-	msm_dp_add_event(dp, EV_USER_NOTIFICATION, true, 0);
+	msm_dp_display_send_hpd_notification(dp, true);
 
 end:
 	return rc;
@@ -506,7 +498,7 @@ static int msm_dp_display_notify_disconnect(struct device *dev)
 {
 	struct msm_dp_display_private *dp = dev_get_dp_display_private(dev);
 
-	msm_dp_add_event(dp, EV_USER_NOTIFICATION, false, 0);
+	msm_dp_display_send_hpd_notification(dp, false);
 
 	return 0;
 }
@@ -527,7 +519,7 @@ static int msm_dp_display_handle_port_status_changed(struct msm_dp_display_priva
 		drm_dbg_dp(dp->drm_dev, "sink count is zero, nothing to do\n");
 		if (dp->hpd_state != ST_DISCONNECTED) {
 			dp->hpd_state = ST_DISCONNECT_PENDING;
-			msm_dp_add_event(dp, EV_USER_NOTIFICATION, false, 0);
+			msm_dp_display_send_hpd_notification(dp, false);
 		}
 	} else {
 		if (dp->hpd_state == ST_DISCONNECTED) {
@@ -1121,10 +1113,6 @@ static int hpd_event_thread(void *data)
 		case EV_IRQ_HPD_INT:
 			msm_dp_irq_hpd_handle(msm_dp_priv, todo->data);
 			break;
-		case EV_USER_NOTIFICATION:
-			msm_dp_display_send_hpd_notification(msm_dp_priv,
-						todo->data);
-			break;
 		default:
 			break;
 		}
diff --git a/drivers/gpu/drm/msm/dp/dp_display.h b/drivers/gpu/drm/msm/dp/dp_display.h
index cc6e2cab36e9..60094061c102 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.h
+++ b/drivers/gpu/drm/msm/dp/dp_display.h
@@ -16,6 +16,7 @@ struct msm_dp {
 	struct platform_device *pdev;
 	struct drm_connector *connector;
 	struct drm_bridge *next_bridge;
+	struct drm_bridge *bridge;
 	bool link_ready;
 	bool audio_enabled;
 	bool power_on;
diff --git a/drivers/gpu/drm/msm/dp/dp_drm.c b/drivers/gpu/drm/msm/dp/dp_drm.c
index e4622c85fb66..f935093c4df4 100644
--- a/drivers/gpu/drm/msm/dp/dp_drm.c
+++ b/drivers/gpu/drm/msm/dp/dp_drm.c
@@ -340,6 +340,8 @@ int msm_dp_bridge_init(struct msm_dp *msm_dp_display, struct drm_device *dev,
 		}
 	}
 
+	msm_dp_display->bridge = bridge;
+
 	return 0;
 }
 

-- 
2.47.3