linux-kernel - [PATCH v3 32/38] drm/msm/dp: propagate MST state changes to dp mst module

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Message-Id: <20250825-msm-dp-mst-v3-32-01faacfcdedd@oss.qualcomm.com>
Date: Mon, 25 Aug 2025 22:16:18 +0800
From: Yongxing Mou <yongxing.mou@....qualcomm.com>
To: Rob Clark <robin.clark@....qualcomm.com>,
        Dmitry Baryshkov <lumag@...nel.org>,
        Abhinav Kumar <abhinav.kumar@...ux.dev>,
        Jessica Zhang <jessica.zhang@....qualcomm.com>,
        Sean Paul <sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>
Cc: linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Yongxing Mou <yongxing.mou@....qualcomm.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>
Subject: [PATCH v3 32/38] drm/msm/dp: propagate MST state changes to dp mst
 module

Introduce APIs to update the MST state change to MST framework when
device is plugged/unplugged.

Signed-off-by: Abhinav Kumar <quic_abhinavk@...cinc.com>
Signed-off-by: Yongxing Mou <yongxing.mou@....qualcomm.com>
---
 drivers/gpu/drm/msm/dp/dp_display.c | 10 +++++++++-
 drivers/gpu/drm/msm/dp/dp_mst_drm.c | 15 +++++++++++++++
 drivers/gpu/drm/msm/dp/dp_mst_drm.h |  1 +
 3 files changed, 25 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
index 59720e1ad4b1193e33a4fc6aad0c401eaf9cbec8..909c84a5c97f56138d0d62c5d856d2fd18d36b8c 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -28,6 +28,7 @@
 #include "dp_drm.h"
 #include "dp_audio.h"
 #include "dp_debug.h"
+#include "dp_mst_drm.h"
 
 static bool psr_enabled = false;
 module_param(psr_enabled, bool, 0);
@@ -269,7 +270,6 @@ static int msm_dp_display_send_hpd_notification(struct msm_dp_display_private *d
 		dp->panel->video_test = false;
 	}
 
-
 	drm_dbg_dp(dp->drm_dev, "type=%d hpd=%d\n",
 			dp->msm_dp_display.connector_type, hpd);
 
@@ -386,6 +386,9 @@ static int msm_dp_display_process_hpd_high(struct msm_dp_display_private *dp)
 
 	msm_dp_link_reset_phy_params_vx_px(dp->link);
 
+	if (dp->msm_dp_display.mst_active)
+		msm_dp_mst_display_set_mgr_state(&dp->msm_dp_display, true);
+
 	if (!dp->msm_dp_display.internal_hpd)
 		msm_dp_display_send_hpd_notification(dp, true);
 
@@ -608,6 +611,11 @@ static int msm_dp_hpd_unplug_handle(struct msm_dp_display_private *dp, u32 data)
 	if (!dp->msm_dp_display.internal_hpd)
 		msm_dp_display_send_hpd_notification(dp, false);
 
+	if (dp->msm_dp_display.mst_active) {
+		msm_dp_mst_display_set_mgr_state(&dp->msm_dp_display, false);
+		dp->msm_dp_display.mst_active = false;
+	}
+
 	/* signal the disconnect event early to ensure proper teardown */
 	msm_dp_display_handle_plugged_change(&dp->msm_dp_display, false);
 
diff --git a/drivers/gpu/drm/msm/dp/dp_mst_drm.c b/drivers/gpu/drm/msm/dp/dp_mst_drm.c
index 331d08854049d9c74d49aa231f3507539986099e..ca654b1963467c8220dd7ee073f25216455d0490 100644
--- a/drivers/gpu/drm/msm/dp/dp_mst_drm.c
+++ b/drivers/gpu/drm/msm/dp/dp_mst_drm.c
@@ -924,6 +924,21 @@ msm_dp_mst_add_connector(struct drm_dp_mst_topology_mgr *mgr,
 	return connector;
 }
 
+int msm_dp_mst_display_set_mgr_state(struct msm_dp *dp_display, bool state)
+{
+	int rc;
+	struct msm_dp_mst *mst = dp_display->msm_dp_mst;
+
+	rc = drm_dp_mst_topology_mgr_set_mst(&mst->mst_mgr, state);
+	if (rc < 0) {
+		DRM_ERROR("failed to set topology mgr state to %d. rc %d\n",
+			  state, rc);
+	}
+
+	drm_dbg_dp(dp_display->drm_dev, "dp_mst_display_set_mgr_state state:%d\n", state);
+	return rc;
+}
+
 static const struct drm_dp_mst_topology_cbs msm_dp_mst_drm_cbs = {
 	.add_connector = msm_dp_mst_add_connector,
 };
diff --git a/drivers/gpu/drm/msm/dp/dp_mst_drm.h b/drivers/gpu/drm/msm/dp/dp_mst_drm.h
index 5e1b4db8aea4506b0e1cc1cc68980dd617d3f72a..8fe6cbbe741da4abb232256b3a15ba6b16ca4f3e 100644
--- a/drivers/gpu/drm/msm/dp/dp_mst_drm.h
+++ b/drivers/gpu/drm/msm/dp/dp_mst_drm.h
@@ -87,5 +87,6 @@ int msm_dp_mst_drm_bridge_init(struct msm_dp *dp, struct drm_encoder *encoder);
 int msm_dp_mst_init(struct msm_dp *dp_display, u32 max_streams, struct drm_dp_aux *drm_aux);
 
 void msm_dp_mst_display_hpd_irq(struct msm_dp *dp_display);
+int msm_dp_mst_display_set_mgr_state(struct msm_dp *dp_display, bool state);
 
 #endif /* _DP_MST_DRM_H_ */

-- 
2.34.1