linux-kernel - [PATCH 08/45] drm/msm/dp: re-arrange dp_display

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Message-ID: <20241205-dp_mst-v1-8-f8618d42a99a@quicinc.com>
Date: Thu, 5 Dec 2024 20:31:39 -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 08/45] drm/msm/dp: re-arrange dp_display_disable() into
 functional parts

dp_display_disable() handles special case of when monitor is
disconnected from the dongle while the dongle stays connected
thereby needing a separate function dp_ctrl_off_link_stream()
for this. However with a slight rework this can still be handled
by keeping common paths same for regular and special case.

Signed-off-by: Abhinav Kumar <quic_abhinavk@...cinc.com>
---
 drivers/gpu/drm/msm/dp/dp_ctrl.c    | 29 +++++++++++++++--------------
 drivers/gpu/drm/msm/dp/dp_ctrl.h    |  4 ++++
 drivers/gpu/drm/msm/dp/dp_display.c | 25 ++++++++++++-------------
 3 files changed, 31 insertions(+), 27 deletions(-)

diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.c b/drivers/gpu/drm/msm/dp/dp_ctrl.c
index 763bd58c24d29d49caafb76eab32b493e1618e7b..9e08996be0cb969cb96d9a3019c445ab4dfc92ef 100644
--- a/drivers/gpu/drm/msm/dp/dp_ctrl.c
+++ b/drivers/gpu/drm/msm/dp/dp_ctrl.c
@@ -2042,30 +2042,31 @@ int msm_dp_ctrl_on_stream(struct msm_dp_ctrl *msm_dp_ctrl)
 	return ret;
 }
 
-void msm_dp_ctrl_off_link_stream(struct msm_dp_ctrl *msm_dp_ctrl)
+void msm_dp_ctrl_clear_vsc_sdp_pkt(struct msm_dp_ctrl *msm_dp_ctrl)
 {
 	struct msm_dp_ctrl_private *ctrl;
-	struct phy *phy;
 
 	ctrl = container_of(msm_dp_ctrl, struct msm_dp_ctrl_private, msm_dp_ctrl);
-	phy = ctrl->phy;
-
 	msm_dp_catalog_panel_disable_vsc_sdp(ctrl->catalog);
+}
 
-	/* set dongle to D3 (power off) mode */
-	msm_dp_link_psm_config(ctrl->link, &ctrl->panel->link_info, true);
+void msm_dp_ctrl_psm_config(struct msm_dp_ctrl *msm_dp_ctrl)
+{
+	struct msm_dp_ctrl_private *ctrl;
 
-	msm_dp_catalog_ctrl_mainlink_ctrl(ctrl->catalog, false);
+	ctrl = container_of(msm_dp_ctrl, struct msm_dp_ctrl_private, msm_dp_ctrl);
 
-	if (ctrl->stream_clks_on) {
-		clk_disable_unprepare(ctrl->pixel_clk);
-		ctrl->stream_clks_on = false;
-	}
+	/* set dongle to D3 (power off) mode */
+	msm_dp_link_psm_config(ctrl->link, &ctrl->panel->link_info, true);
+}
 
-	dev_pm_opp_set_rate(ctrl->dev, 0);
-	msm_dp_ctrl_link_clk_disable(&ctrl->msm_dp_ctrl);
+void msm_dp_ctrl_reinit_phy(struct msm_dp_ctrl *msm_dp_ctrl)
+{
+	struct msm_dp_ctrl_private *ctrl;
+	struct phy *phy;
 
-	phy_power_off(phy);
+	ctrl = container_of(msm_dp_ctrl, struct msm_dp_ctrl_private, msm_dp_ctrl);
+	phy = ctrl->phy;
 
 	/* aux channel down, reinit phy */
 	phy_exit(phy);
diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.h b/drivers/gpu/drm/msm/dp/dp_ctrl.h
index 42745c912adbad7221c78f5cecefa730bfda1e75..0f58b63c5c7c5aab43c0db2a697ba491959b79d2 100644
--- a/drivers/gpu/drm/msm/dp/dp_ctrl.h
+++ b/drivers/gpu/drm/msm/dp/dp_ctrl.h
@@ -42,4 +42,8 @@ void msm_dp_ctrl_config_psr(struct msm_dp_ctrl *msm_dp_ctrl);
 int msm_dp_ctrl_core_clk_enable(struct msm_dp_ctrl *msm_dp_ctrl);
 void msm_dp_ctrl_core_clk_disable(struct msm_dp_ctrl *msm_dp_ctrl);
 
+void msm_dp_ctrl_clear_vsc_sdp_pkt(struct msm_dp_ctrl *msm_dp_ctrl);
+void msm_dp_ctrl_psm_config(struct msm_dp_ctrl *msm_dp_ctrl);
+void msm_dp_ctrl_reinit_phy(struct msm_dp_ctrl *msm_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 434380b442ec84c12c240dab6538ccdf31963cea..bbce8ca09ff70059458231982f002e1f22d2c3ab 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -905,20 +905,19 @@ static int msm_dp_display_disable(struct msm_dp_display_private *dp)
 	if (!msm_dp_display->power_on)
 		return 0;
 
-	if (dp->link->sink_count == 0) {
-		/*
-		 * irq_hpd with sink_count = 0
-		 * hdmi unplugged out of dongle
-		 */
-		msm_dp_ctrl_off_link_stream(dp->ctrl);
-	} else {
-		/*
-		 * unplugged interrupt
-		 * dongle unplugged out of DUT
-		 */
-		msm_dp_ctrl_off(dp->ctrl);
+	msm_dp_ctrl_clear_vsc_sdp_pkt(dp->ctrl);
+
+	/* dongle is still connected but sinks are disconnected */
+	if (dp->link->sink_count == 0)
+		msm_dp_ctrl_psm_config(dp->ctrl);
+
+	msm_dp_ctrl_off(dp->ctrl);
+
+	/* re-init the PHY so that we can listen to Dongle disconnect */
+	if (dp->link->sink_count == 0)
+		msm_dp_ctrl_reinit_phy(dp->ctrl);
+	else
 		msm_dp_display_host_phy_exit(dp);
-	}
 
 	msm_dp_display->power_on = false;
 

-- 
2.34.1