linux-kernel - [PATCH v2 38/38] drm/msm/dp: Add MST stream support for SA8775P DP controller 0 and 1

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Message-ID: <20250609-msm-dp-mst-v2-38-a54d8902a23d@quicinc.com>
Date: Mon, 9 Jun 2025 20:21:57 +0800
From: Yongxing Mou <quic_yongmou@...cinc.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" <quic_yongmou@...cinc.com>
Subject: [PATCH v2 38/38] drm/msm/dp: Add MST stream support for SA8775P DP
 controller 0 and 1

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

Signed-off-by: Yongxing Mou <quic_yongmou@...cinc.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 75f2fd7c75eae81e5c843f8ae2d1ce12ad0cad7e..16196dcc9ff4ac6a35b6bcd8d433b08f7d18fe5b 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -127,8 +127,10 @@ 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 = 2},
+	{ .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