linux-kernel - [PATCH v3 27/38] drm/msm/dp: add dp_display_get

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Message-Id: <20250825-msm-dp-mst-v3-27-01faacfcdedd@oss.qualcomm.com>
Date: Mon, 25 Aug 2025 22:16:13 +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 27/38] drm/msm/dp: add dp_display_get_panel() to
 initialize DP panel

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

Add an API dp_display_get_panel() to initialize and return a DP
panel to be used by DP MST module. Since some of the fields of
DP panel are private, dp_display module needs to initialize these
parts and return the panel back.

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 | 23 +++++++++++++++++++++++
 drivers/gpu/drm/msm/dp/dp_display.h |  2 ++
 2 files changed, 25 insertions(+)

diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
index 84df34306fb557341bea288ea8c13b0c81b11919..abcab3ed43b6da5ef898355cf9b7561cd9fe0404 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -632,6 +632,29 @@ static int msm_dp_irq_hpd_handle(struct msm_dp_display_private *dp, u32 data)
 	return 0;
 }
 
+struct msm_dp_panel *msm_dp_display_get_panel(struct msm_dp *msm_dp_display)
+{
+	struct msm_dp_display_private *dp;
+	struct msm_dp_panel *dp_panel;
+
+	dp = container_of(msm_dp_display, struct msm_dp_display_private, msm_dp_display);
+
+	dp_panel = msm_dp_panel_get(&dp->msm_dp_display.pdev->dev, dp->aux, dp->link,
+			       dp->link_base, dp->mst2link_base, dp->mst3link_base,
+			       dp->pixel_base);
+
+	if (IS_ERR(dp->panel)) {
+		DRM_ERROR("failed to initialize panel\n");
+		return NULL;
+	}
+
+	memcpy(dp_panel->dpcd, dp->panel->dpcd, DP_RECEIVER_CAP_SIZE);
+	memcpy(&dp_panel->link_info, &dp->panel->link_info,
+	       sizeof(dp->panel->link_info));
+
+	return dp_panel;
+}
+
 static void msm_dp_display_deinit_sub_modules(struct msm_dp_display_private *dp)
 {
 	msm_dp_audio_put(dp->audio);
diff --git a/drivers/gpu/drm/msm/dp/dp_display.h b/drivers/gpu/drm/msm/dp/dp_display.h
index b1ea027438d952c94f3ae80725c92e46c631bdb2..d5889b801d190b6f33b180ead898c1e4ebcbf8f3 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.h
+++ b/drivers/gpu/drm/msm/dp/dp_display.h
@@ -65,4 +65,6 @@ void msm_dp_display_unprepare(struct msm_dp *dp);
 
 int msm_dp_display_get_active_stream_cnt(struct msm_dp *msm_dp_display);
 
+struct msm_dp_panel *msm_dp_display_get_panel(struct msm_dp *msm_dp_display);
+
 #endif /* _DP_DISPLAY_H_ */

-- 
2.34.1