linux-kernel - [PATCH v3 8/8] drm/msm/dp: Add sink_count and link

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Message-Id: <20260115-hpd-refactor-v3-8-08e2f3bcd2e0@oss.qualcomm.com>
Date: Thu, 15 Jan 2026 09:29:13 +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 8/8] drm/msm/dp: Add sink_count and link_ready to debug
 logs

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

Add sink count and link_ready to the debug logs for [un]plug and HPD IRQ
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 | 36 ++++++++++++++++++++++++------------
 1 file changed, 24 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
index b26fba89e73a..67a193f58ce2 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -388,8 +388,10 @@ static int msm_dp_hpd_plug_handle(struct msm_dp_display_private *dp)
 	int ret;
 	struct platform_device *pdev = dp->msm_dp_display.pdev;
 
-	drm_dbg_dp(dp->drm_dev, "Before, type=%d\n",
-			dp->msm_dp_display.connector_type);
+	drm_dbg_dp(dp->drm_dev, "Before, type=%d sink_count=%d, link_ready=%d\n",
+			dp->msm_dp_display.connector_type,
+			dp->link->sink_count,
+			dp->msm_dp_display.link_ready);
 
 	if (dp->msm_dp_display.link_ready)
 		return 0;
@@ -411,8 +413,10 @@ static int msm_dp_hpd_plug_handle(struct msm_dp_display_private *dp)
 		pm_runtime_put_sync(&pdev->dev);
 	}
 
-	drm_dbg_dp(dp->drm_dev, "After, type=%d\n",
-			dp->msm_dp_display.connector_type);
+	drm_dbg_dp(dp->drm_dev, "After, type=%d sink_count=%d, link_ready=%d\n",
+			dp->msm_dp_display.connector_type,
+			dp->link->sink_count,
+			dp->msm_dp_display.link_ready);
 
 	/* uevent will complete connection part */
 	return 0;
@@ -440,8 +444,10 @@ static int msm_dp_hpd_unplug_handle(struct msm_dp_display_private *dp)
 
 	msm_dp_aux_enable_xfers(dp->aux, false);
 
-	drm_dbg_dp(dp->drm_dev, "Before, type=%d\n",
-			dp->msm_dp_display.connector_type);
+	drm_dbg_dp(dp->drm_dev, "Before, type=%d sink_count=%d, link_ready=%d\n",
+			dp->msm_dp_display.connector_type,
+			dp->link->sink_count,
+			dp->msm_dp_display.link_ready);
 
 	if (!dp->msm_dp_display.link_ready)
 		return 0;
@@ -465,8 +471,10 @@ static int msm_dp_hpd_unplug_handle(struct msm_dp_display_private *dp)
 	/* signal the disconnect event early to ensure proper teardown */
 	msm_dp_display_handle_plugged_change(&dp->msm_dp_display, false);
 
-	drm_dbg_dp(dp->drm_dev, "After, type=%d\n",
-			dp->msm_dp_display.connector_type);
+	drm_dbg_dp(dp->drm_dev, "After, type=%d, sink_count=%d, link_ready=%d\n",
+			dp->msm_dp_display.connector_type,
+			dp->link->sink_count,
+			dp->msm_dp_display.link_ready);
 
 	/* uevent will complete disconnection part */
 	pm_runtime_put_sync(&pdev->dev);
@@ -479,8 +487,10 @@ static int msm_dp_irq_hpd_handle(struct msm_dp_display_private *dp)
 	int rc = 0;
 
 	/* irq_hpd can happen at either connected or disconnected state */
-	drm_dbg_dp(dp->drm_dev, "Before, type=%d\n",
-			dp->msm_dp_display.connector_type);
+	drm_dbg_dp(dp->drm_dev, "Before, type=%d, sink_count=%d, link_ready=%d\n",
+			dp->msm_dp_display.connector_type,
+			dp->link->sink_count,
+			dp->msm_dp_display.link_ready);
 
 	/* check for any test request issued by sink */
 	rc = msm_dp_link_process_request(dp->link);
@@ -493,8 +503,10 @@ static int msm_dp_irq_hpd_handle(struct msm_dp_display_private *dp)
 			rc = msm_dp_display_handle_irq_hpd(dp);
 	}
 
-	drm_dbg_dp(dp->drm_dev, "After, type=%d\n",
-			dp->msm_dp_display.connector_type);
+	drm_dbg_dp(dp->drm_dev, "After, type=%d, sink_count=%d, link_ready=%d\n",
+			dp->msm_dp_display.connector_type,
+			dp->link->sink_count,
+			dp->msm_dp_display.link_ready);
 
 	return rc;
 }

-- 
2.47.3