linux-kernel - [PATCH v3 38/38] drm/msm/dp: Add MST stream support for SA8775P DP controller 0 and 1

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Message-Id: <20250825-msm-dp-mst-v3-38-01faacfcdedd@oss.qualcomm.com>
Date: Mon, 25 Aug 2025 22:16:24 +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>
Subject: [PATCH v3 38/38] drm/msm/dp: Add MST stream support for SA8775P DP
 controller 0 and 1

This change enables SA8775P support for Multi-Stream Transport (MST),
allowing each controller to handle up to two or four DisplayPort streams.
As all necessary code for MST support was already implemented in the
previous series of patches.

Signed-off-by: Yongxing Mou <yongxing.mou@....qualcomm.com>
---
 drivers/gpu/drm/msm/dp/dp_display.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
index 897ef653b3cea08904bb3595e8ac10fd7fcf811f..4a94f37513c21f9a273080b572a1e50a186a45ce 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -108,8 +108,10 @@ struct msm_dp_desc {
 };
 
 static const struct msm_dp_desc msm_dp_desc_sa8775p[] = {
-	{ .io_start = 0x0af54000, .id = MSM_DP_CONTROLLER_0, .wide_bus_supported = true },
-	{ .io_start = 0x0af5c000, .id = MSM_DP_CONTROLLER_1, .wide_bus_supported = true },
+	{ .io_start = 0x0af54000, .id = MSM_DP_CONTROLLER_0, .wide_bus_supported = true,
+	  .mst_streams = 4},
+	{ .io_start = 0x0af5c000, .id = MSM_DP_CONTROLLER_1, .wide_bus_supported = true,
+	  .mst_streams = 2},
 	{ .io_start = 0x22154000, .id = MSM_DP_CONTROLLER_2, .wide_bus_supported = true },
 	{ .io_start = 0x2215c000, .id = MSM_DP_CONTROLLER_3, .wide_bus_supported = true },
 	{}

-- 
2.34.1