linux-kernel - [PATCH 43/45] drm/msm/dp: populate the max

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Message-ID: <20241205-dp_mst-v1-43-f8618d42a99a@quicinc.com>
Date: Thu, 5 Dec 2024 20:32:14 -0800
From: Abhinav Kumar <quic_abhinavk@...cinc.com>
To: Rob Clark <robdclark@...il.com>,
        Dmitry Baryshkov
	<dmitry.baryshkov@...aro.org>,
        Sean Paul <sean@...rly.run>,
        Marijn Suijten
	<marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, "Simona
 Vetter" <simona@...ll.ch>,
        Stephen Boyd <swboyd@...omium.org>,
        "Chandan
 Uddaraju" <chandanu@...eaurora.org>,
        Guenter Roeck <groeck@...omium.org>,
        Kuogee Hsieh <quic_khsieh@...cinc.com>,
        Bjorn Andersson
	<andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, Rob Herring
	<robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
	<conor+dt@...nel.org>
CC: Vara Reddy <quic_varar@...cinc.com>, Rob Clark <robdclark@...omium.org>,
        Tanmay Shah <tanmay@...eaurora.org>, <linux-arm-msm@...r.kernel.org>,
        <dri-devel@...ts.freedesktop.org>, <freedreno@...ts.freedesktop.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        Jessica Zhang
	<quic_jesszhan@...cinc.com>,
        Laurent Pinchart
	<laurent.pinchart@...asonboard.com>,
        Abhinav Kumar
	<quic_abhinavk@...cinc.com>
Subject: [PATCH 43/45] drm/msm/dp: populate the max_streams for sa8775 mst
 controller

Populate the max_streams for DP controllers to indicate MST support.

If the pixel clock handle for the second stream fails, treat it as
SST case rather than a complete failure.

Signed-off-by: Abhinav Kumar <quic_abhinavk@...cinc.com>
---
 drivers/gpu/drm/msm/dp/dp_ctrl.c    |  9 +++++++++
 drivers/gpu/drm/msm/dp/dp_ctrl.h    |  2 ++
 drivers/gpu/drm/msm/dp/dp_display.c | 13 ++++++++++---
 3 files changed, 21 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.c b/drivers/gpu/drm/msm/dp/dp_ctrl.c
index d4915a962f97b3d2a347456e197265a5dc043eb0..0e5ebcdab00936cf0ce6e35514f2932158530cc0 100644
--- a/drivers/gpu/drm/msm/dp/dp_ctrl.c
+++ b/drivers/gpu/drm/msm/dp/dp_ctrl.c
@@ -2438,6 +2438,15 @@ static int msm_dp_ctrl_clk_init(struct msm_dp_ctrl *msm_dp_ctrl)
 	return 0;
 }
 
+int msm_dp_ctrl_get_stream_cnt(struct msm_dp_ctrl *msm_dp_ctrl)
+{
+	struct msm_dp_ctrl_private *ctrl;
+
+	ctrl = container_of(msm_dp_ctrl, struct msm_dp_ctrl_private, msm_dp_ctrl);
+
+	return ctrl->num_pixel_clks;
+}
+
 struct msm_dp_ctrl *msm_dp_ctrl_get(struct device *dev, struct msm_dp_link *link,
 			struct msm_dp_panel *panel,	struct drm_dp_aux *aux,
 			struct msm_dp_catalog *catalog,
diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.h b/drivers/gpu/drm/msm/dp/dp_ctrl.h
index 9ad7022d6217572395d69294c3cc4d4dbaddf0ac..f72a499809ec01a9cc5bb79762bc2604820426a1 100644
--- a/drivers/gpu/drm/msm/dp/dp_ctrl.h
+++ b/drivers/gpu/drm/msm/dp/dp_ctrl.h
@@ -54,4 +54,6 @@ void msm_dp_ctrl_set_mst_channel_info(struct msm_dp_ctrl *msm_dp_ctrl,
 				      u32 start_slot, u32 tot_slots);
 void msm_dp_ctrl_push_vcpf(struct msm_dp_ctrl *dp_ctrl, struct msm_dp_panel *msm_dp_panel);
 
+int msm_dp_ctrl_get_stream_cnt(struct msm_dp_ctrl *dp_ctrl);
+
 #endif /* _DP_CTRL_H_ */
diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
index 528cda1453a85f5f8dd37bb0d2366548016c88e4..db563af19461089dbcaccce0d03fd03d5aa567aa 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -126,6 +126,7 @@ struct msm_dp_desc {
 	unsigned int id;
 	bool wide_bus_supported;
 	const unsigned int *intf_map;
+	unsigned int max_streams;
 };
 
 /* to be kept in sync with enum dpu_intf of dpu_hw_mdss.h */
@@ -149,10 +150,10 @@ static const unsigned int stream_intf_map_sa_8775p[][DP_STREAM_MAX] = {
 };
 
 static const struct msm_dp_desc msm_dp_desc_sa8775p[] = {
-	{ .io_start = 0x0af54000, .id = MSM_DP_CONTROLLER_0, .wide_bus_supported = true,
+	{ .io_start = 0x0af54000, .id = MSM_DP_CONTROLLER_0, .wide_bus_supported = true, .max_streams = 2,
 	  .intf_map = stream_intf_map_sa_8775p[MSM_DP_CONTROLLER_0],
 	},
-	{ .io_start = 0x0af5c000, .id = MSM_DP_CONTROLLER_1, .wide_bus_supported = true,
+	{ .io_start = 0x0af5c000, .id = MSM_DP_CONTROLLER_1, .wide_bus_supported = true, .max_streams = 2,
 	  .intf_map = stream_intf_map_sa_8775p[MSM_DP_CONTROLLER_1],
 	},
 	{ .io_start = 0x22154000, .id = MSM_DP_CONTROLLER_2, .wide_bus_supported = true },
@@ -1481,7 +1482,10 @@ int msm_dp_get_mst_max_stream(const struct msm_dp *dp_display)
 
 	dp_priv = container_of(dp_display, struct msm_dp_display_private, msm_dp_display);
 
-	return dp_priv->max_stream;
+	if (dp_priv->max_stream == msm_dp_ctrl_get_stream_cnt(dp_priv->ctrl))
+		return dp_priv->max_stream;
+	else
+		return DEFAULT_STREAM_COUNT;
 }
 
 int msm_dp_mst_bridge_init(struct msm_dp *dp_display, struct drm_encoder *encoder)
@@ -1517,6 +1521,9 @@ static int msm_dp_display_probe(struct platform_device *pdev)
 
 	dp->max_stream = DEFAULT_STREAM_COUNT;
 
+	if (desc->max_streams > DEFAULT_STREAM_COUNT)
+		dp->max_stream = desc->max_streams;
+
 	dp->intf_map = desc->intf_map;
 
 	rc = msm_dp_init_sub_modules(dp);

-- 
2.34.1