linux-kernel - [PATCH v2 10/38] drm/msm/dp: introduce the max

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Message-ID: <20250609-msm-dp-mst-v2-10-a54d8902a23d@quicinc.com>
Date: Mon, 9 Jun 2025 20:21:29 +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>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>
Subject: [PATCH v2 10/38] drm/msm/dp: introduce the max_streams for dp
 controller

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

Introduce the mst_streams for each DP controller to specify the number
of supported MST streams. On most platforms, the supported MST streams
number is 2 or 4. For platforms that do not support MST, define
DEFAULT_STREAM_COUNT as 1. Also exist platform that DP0 supports 4
streams while DP1 support 2 streams.

Signed-off-by: Abhinav Kumar <quic_abhinavk@...cinc.com>
Signed-off-by: Yongxing Mou <quic_yongmou@...cinc.com>
---
 drivers/gpu/drm/msm/dp/dp_display.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
index 7ed4034c89605596c874a6bf9a5a19586d6c13fb..4e0213cae4aafb468681db27b3c3fef28d44b2c0 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -34,6 +34,7 @@ module_param(psr_enabled, bool, 0);
 MODULE_PARM_DESC(psr_enabled, "enable PSR for eDP and DP displays");
 
 #define HPD_STRING_SIZE 30
+#define DEFAULT_STREAM_COUNT 1
 
 enum {
 	ISR_DISCONNECTED,
@@ -83,6 +84,7 @@ struct msm_dp_display_private {
 	bool core_initialized;
 	bool phy_initialized;
 	bool audio_supported;
+	bool mst_supported;
 
 	struct drm_device *drm_dev;
 
@@ -110,12 +112,14 @@ struct msm_dp_display_private {
 	bool wide_bus_supported;
 
 	struct msm_dp_audio *audio;
+	int max_stream;
 };
 
 struct msm_dp_desc {
 	phys_addr_t io_start;
 	unsigned int id;
 	bool wide_bus_supported;
+	int mst_streams;
 };
 
 static const struct msm_dp_desc msm_dp_desc_sa8775p[] = {
@@ -1330,6 +1334,14 @@ static int msm_dp_display_probe(struct platform_device *pdev)
 	dp->msm_dp_display.is_edp =
 		(dp->msm_dp_display.connector_type == DRM_MODE_CONNECTOR_eDP);
 
+	dp->max_stream = DEFAULT_STREAM_COUNT;
+	dp->mst_supported = FALSE;
+
+	if (desc->mst_streams > DEFAULT_STREAM_COUNT) {
+		dp->max_stream = desc->mst_streams;
+		dp->mst_supported = TRUE;
+	}
+
 	rc = msm_dp_init_sub_modules(dp);
 	if (rc) {
 		DRM_ERROR("init sub module failed\n");

-- 
2.34.1