linux-kernel - [PATCH v3 1/2] drm/msm/dp: Add support for determining the eDP/DP mode from DT

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Date: Fri, 22 Mar 2024 15:22:22 +0200
From: Abel Vesa <abel.vesa@...aro.org>
To: Rob Clark <robdclark@...il.com>, 
 Abhinav Kumar <quic_abhinavk@...cinc.com>, 
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, Sean Paul <sean@...rly.run>, 
 Marijn Suijten <marijn.suijten@...ainline.org>, 
 David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, 
 Conor Dooley <conor+dt@...nel.org>, Kuogee Hsieh <quic_khsieh@...cinc.com>, 
 Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konrad.dybcio@...aro.org>, 
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, 
 Johan Hovold <johan@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org, 
 freedreno@...ts.freedesktop.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Abel Vesa <abel.vesa@...aro.org>
Subject: [PATCH v3 1/2] drm/msm/dp: Add support for determining the eDP/DP
 mode from DT

Instead of relying on different compatibles for eDP and DP, lookup
the panel node in devicetree to figure out the connector type and
then pass on that information to the PHY. External DP is not described
in DT, therefore, assume it's eDP if panel node is present.

Signed-off-by: Abel Vesa <abel.vesa@...aro.org>
---
 drivers/gpu/drm/msm/dp/dp_display.c | 43 +++++++++++++++++++++++++++++++++----
 1 file changed, 39 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
index c4cb82af5c2f..c9763f77c832 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -726,6 +726,14 @@ static int dp_init_sub_modules(struct dp_display_private *dp)
 	if (IS_ERR(phy))
 		return PTR_ERR(phy);
 
+	rc = phy_set_mode_ext(phy, PHY_MODE_DP,
+			      dp->dp_display.is_edp ? PHY_SUBMODE_EDP : PHY_SUBMODE_DP);
+	if (rc) {
+		DRM_ERROR("failed to set phy submode, rc = %d\n", rc);
+		dp->catalog = NULL;
+		goto error;
+	}
+
 	dp->catalog = dp_catalog_get(dev);
 	if (IS_ERR(dp->catalog)) {
 		rc = PTR_ERR(dp->catalog);
@@ -734,9 +742,7 @@ static int dp_init_sub_modules(struct dp_display_private *dp)
 		goto error;
 	}
 
-	dp->aux = dp_aux_get(dev, dp->catalog,
-			     phy,
-			     dp->dp_display.is_edp);
+	dp->aux = dp_aux_get(dev, dp->catalog, phy, dp->dp_display.is_edp);
 	if (IS_ERR(dp->aux)) {
 		rc = PTR_ERR(dp->aux);
 		DRM_ERROR("failed to initialize aux, rc = %d\n", rc);
@@ -1241,6 +1247,35 @@ static int dp_auxbus_done_probe(struct drm_dp_aux *aux)
 	return dp_display_probe_tail(aux->dev);
 }
 
+static int dp_display_get_connector_type(struct platform_device *pdev,
+					 const struct msm_dp_desc *desc)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *aux_bus;
+	struct device_node *panel;
+	int ret = DRM_MODE_CONNECTOR_DisplayPort;
+
+	/* legacy platforms specify connector type in match data */
+	if (desc->connector_type == DRM_MODE_CONNECTOR_eDP ||
+		desc->connector_type == DRM_MODE_CONNECTOR_DisplayPort)
+		return desc->connector_type;
+
+	aux_bus = of_get_child_by_name(dev->of_node, "aux-bus");
+	if (!aux_bus)
+		goto out;
+
+	panel = of_get_child_by_name(aux_bus, "panel");
+	if (!panel)
+		goto out;
+
+	ret = DRM_MODE_CONNECTOR_eDP;
+
+out:
+	of_node_put(panel);
+	of_node_put(aux_bus);
+	return ret;
+}
+
 static int dp_display_probe(struct platform_device *pdev)
 {
 	int rc = 0;
@@ -1263,7 +1298,7 @@ static int dp_display_probe(struct platform_device *pdev)
 	dp->dp_display.pdev = pdev;
 	dp->name = "drm_dp";
 	dp->id = desc->id;
-	dp->dp_display.connector_type = desc->connector_type;
+	dp->dp_display.connector_type = dp_display_get_connector_type(pdev, desc);
 	dp->wide_bus_supported = desc->wide_bus_supported;
 	dp->dp_display.is_edp =
 		(dp->dp_display.connector_type == DRM_MODE_CONNECTOR_eDP);

-- 
2.34.1