linux-kernel - [PATCH v3 35/38] drm/msm/dp: initialize dp

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Message-Id: <20250825-msm-dp-mst-v3-35-01faacfcdedd@oss.qualcomm.com>
Date: Mon, 25 Aug 2025 22:16:21 +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 35/38] drm/msm/dp: initialize dp_mst module for each DP
 MST controller

From: Abhinav Kumar <quic_abhinavk@...cinc.com>

For each MST capable DP controller, initialize a dp_mst module to
manage its DP MST operations. The DP MST module for each controller
is the central entity to manage its topology related operations as
well as interfacing with the rest of the DP driver.

Signed-off-by: Abhinav Kumar <quic_abhinavk@...cinc.com>
Signed-off-by: Yongxing Mou <yongxing.mou@....qualcomm.com>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c | 6 ++++++
 drivers/gpu/drm/msm/dp/dp_display.c     | 9 +++++++++
 drivers/gpu/drm/msm/msm_drv.h           | 6 ++++++
 3 files changed, 21 insertions(+)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
index 0b9d9207f4f69e0d0725ff265c624828b5816a8b..4036d3445946930e635401109ac4720ed2282c2f 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
@@ -681,6 +681,12 @@ static int _dpu_kms_initialize_displayport(struct drm_device *dev,
 		stream_cnt = msm_dp_get_mst_max_stream(priv->kms->dp[i]);
 
 		if (stream_cnt > 1) {
+			rc = msm_dp_mst_register(priv->kms->dp[i]);
+			if (rc) {
+				DPU_ERROR("dp_mst_init failed for DP, rc = %d\n", rc);
+				return rc;
+			}
+
 			for (stream_id = 0; stream_id < stream_cnt; stream_id++) {
 				info.stream_id = stream_id;
 				encoder = dpu_encoder_init(dev, DRM_MODE_ENCODER_DPMST, &info);
diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
index 909c84a5c97f56138d0d62c5d856d2fd18d36b8c..897ef653b3cea08904bb3595e8ac10fd7fcf811f 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -1586,6 +1586,15 @@ int msm_dp_modeset_init(struct msm_dp *msm_dp_display, struct drm_device *dev,
 	return 0;
 }
 
+inline int msm_dp_mst_register(struct msm_dp *msm_dp_display)
+{
+	struct msm_dp_display_private *dp;
+
+	dp = container_of(msm_dp_display, struct msm_dp_display_private, msm_dp_display);
+
+	return msm_dp_mst_init(msm_dp_display, dp->max_stream, dp->aux);
+}
+
 void msm_dp_display_atomic_prepare(struct msm_dp *msm_dp_display)
 {
 	int rc = 0;
diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
index 3e64ec7b7dbe1d1107e85def9aa80277131f40bf..c46c88cf06598df996a17c23631570fda078b371 100644
--- a/drivers/gpu/drm/msm/msm_drv.h
+++ b/drivers/gpu/drm/msm/msm_drv.h
@@ -365,6 +365,7 @@ bool msm_dp_wide_bus_available(const struct msm_dp *dp_display);
 
 int msm_dp_get_mst_max_stream(struct msm_dp *dp_display);
 int msm_dp_mst_drm_bridge_init(struct msm_dp *dp_display, struct drm_encoder *encoder);
+int msm_dp_mst_register(struct msm_dp *dp_display);
 
 #else
 static inline int __init msm_dp_register(void)
@@ -392,6 +393,11 @@ static inline int msm_dp_mst_drm_bridge_init(struct msm_dp *dp_display, struct d
 	return -EINVAL;
 }
 
+static inline int msm_dp_mst_register(struct msm_dp *dp_display)
+{
+	return -EINVAL;
+}
+
 static inline void msm_dp_snapshot(struct msm_disp_state *disp_state, struct msm_dp *dp_display)
 {
 }

-- 
2.34.1