linux-kernel - [PATCH 19/45] drm/msm/dp: add support to program mst support in mainlink

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Message-ID: <20241205-dp_mst-v1-19-f8618d42a99a@quicinc.com>
Date: Thu, 5 Dec 2024 20:31:50 -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 19/45] drm/msm/dp: add support to program mst support in
 mainlink

Add support to program the MST enabled bit in the mainlink
control when a mst session is active and disabled.

Signed-off-by: Abhinav Kumar <quic_abhinavk@...cinc.com>
---
 drivers/gpu/drm/msm/dp/dp_catalog.c | 17 +++++++++++++++++
 drivers/gpu/drm/msm/dp/dp_catalog.h |  1 +
 drivers/gpu/drm/msm/dp/dp_ctrl.c    |  4 ++++
 3 files changed, 22 insertions(+)

diff --git a/drivers/gpu/drm/msm/dp/dp_catalog.c b/drivers/gpu/drm/msm/dp/dp_catalog.c
index 88d6262a972ef2d30c467ef5ff5c58ef3299ae7d..bdc66e5cab640c351708ba1a1bc3bca21784df6e 100644
--- a/drivers/gpu/drm/msm/dp/dp_catalog.c
+++ b/drivers/gpu/drm/msm/dp/dp_catalog.c
@@ -417,6 +417,23 @@ void msm_dp_catalog_ctrl_psr_mainlink_enable(struct msm_dp_catalog *msm_dp_catal
 	msm_dp_write_link(catalog, REG_DP_MAINLINK_CTRL, val);
 }
 
+void msm_dp_catalog_mst_config(struct msm_dp_catalog *msm_dp_catalog, bool enable)
+{
+	struct msm_dp_catalog_private *catalog = container_of(msm_dp_catalog,
+							      struct msm_dp_catalog_private,
+							      msm_dp_catalog);
+
+	u32 mainlink_ctrl;
+
+	mainlink_ctrl = msm_dp_read_link(catalog, REG_DP_MAINLINK_CTRL);
+	if (enable)
+		mainlink_ctrl |= (0x04000100);
+	else
+		mainlink_ctrl &= ~(0x04000100);
+
+	msm_dp_write_link(catalog, REG_DP_MAINLINK_CTRL, mainlink_ctrl);
+}
+
 void msm_dp_catalog_ctrl_mainlink_ctrl(struct msm_dp_catalog *msm_dp_catalog,
 						bool enable)
 {
diff --git a/drivers/gpu/drm/msm/dp/dp_catalog.h b/drivers/gpu/drm/msm/dp/dp_catalog.h
index c91c52d40209b8bcb63db9c0256f6ef721dace8a..07284f484e2861aeae12b115cd05a94afed1c9cb 100644
--- a/drivers/gpu/drm/msm/dp/dp_catalog.h
+++ b/drivers/gpu/drm/msm/dp/dp_catalog.h
@@ -138,5 +138,6 @@ void msm_dp_catalog_audio_sfe_level(struct msm_dp_catalog *catalog, u32 safe_to_
 /* DP MST APIs */
 void msm_dp_catalog_trigger_act(struct msm_dp_catalog *dp_catalog);
 bool msm_dp_catalog_read_act_complete_sts(struct msm_dp_catalog *dp_catalog);
+void msm_dp_catalog_mst_config(struct msm_dp_catalog *dp_catalog, bool enable);
 
 #endif /* _DP_CATALOG_H_ */
diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.c b/drivers/gpu/drm/msm/dp/dp_ctrl.c
index 2bfe2aac3c02b02b12713dbd98e79ed4a75b85d0..3839f1e8e1aeb2a14a7f59c546693141a0df6323 100644
--- a/drivers/gpu/drm/msm/dp/dp_ctrl.c
+++ b/drivers/gpu/drm/msm/dp/dp_ctrl.c
@@ -186,6 +186,9 @@ static void msm_dp_ctrl_configure_source_params(struct msm_dp_ctrl_private *ctrl
 	msm_dp_catalog_ctrl_lane_mapping(ctrl->catalog);
 	msm_dp_catalog_setup_peripheral_flush(ctrl->catalog);
 
+	if (ctrl->mst_active)
+		msm_dp_catalog_mst_config(ctrl->catalog, true);
+
 	msm_dp_ctrl_config_ctrl(ctrl, msm_dp_panel);
 
 	tb = msm_dp_link_get_test_bits_depth(ctrl->link,
@@ -2132,6 +2135,7 @@ void msm_dp_ctrl_off_link(struct msm_dp_ctrl *msm_dp_ctrl)
 	phy = ctrl->phy;
 
 	msm_dp_catalog_ctrl_mainlink_ctrl(ctrl->catalog, false);
+	msm_dp_catalog_mst_config(ctrl->catalog, false);
 
 	ctrl->mst_active = false;
 

-- 
2.34.1