linux-kernel - [PATCH v4 4/4] drm/msm/dsi: attach external bridge with DRM_BRIDGE_ATTACH_NO

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Date:   Wed,  8 Jul 2020 12:29:24 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Daniel Vetter <daniel@...ll.ch>, David Airlie <airlied@...ux.ie>,
        Rob Clark <robdclark@...il.com>
Cc:     linux-arm-msm@...r.kernel.org,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Vinod Koul <vkoul@...nel.org>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        Emil Velikov <emil.l.velikov@...il.com>,
        Sam Ravnborg <sam@...nborg.org>,
        John Stultz <john.stultz@...aro.org>
Subject: [PATCH v4 4/4] drm/msm/dsi: attach external bridge with DRM_BRIDGE_ATTACH_NO_CONNECTOR

Modern bridges do not create the connector and expect the display driver
to do so. Hence, create the drm connector in msm display driver and add
use flag DRM_BRIDGE_ATTACH_NO_CONNECTOR to attach bridges

Tested-by: John Stultz <john.stultz@...aro.org>
Signed-off-by: Vinod Koul <vkoul@...nel.org>
---
 drivers/gpu/drm/msm/dsi/dsi.c         |  7 +------
 drivers/gpu/drm/msm/dsi/dsi_manager.c | 27 +++++++++++++--------------
 2 files changed, 14 insertions(+), 20 deletions(-)

diff --git a/drivers/gpu/drm/msm/dsi/dsi.c b/drivers/gpu/drm/msm/dsi/dsi.c
index 55ea4bc2ee9c..617075e3e3f0 100644
--- a/drivers/gpu/drm/msm/dsi/dsi.c
+++ b/drivers/gpu/drm/msm/dsi/dsi.c
@@ -219,12 +219,7 @@ int msm_dsi_modeset_init(struct msm_dsi *msm_dsi, struct drm_device *dev,
 		goto fail;
 	}
 
-	/*
-	 * check if the dsi encoder output is connected to a panel or an
-	 * external bridge. We create a connector only if we're connected to a
-	 * drm_panel device. When we're connected to an external bridge, we
-	 * assume that the drm_bridge driver will create the connector itself.
-	 */
+	/* Initialize the internal panel or external bridge */
 	ext_bridge = msm_dsi_host_get_bridge(msm_dsi->host);
 
 	if (ext_bridge)
diff --git a/drivers/gpu/drm/msm/dsi/dsi_manager.c b/drivers/gpu/drm/msm/dsi/dsi_manager.c
index 4b363bd7ddff..72cfd0a8187b 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_manager.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_manager.c
@@ -3,6 +3,7 @@
  * Copyright (c) 2015, The Linux Foundation. All rights reserved.
  */
 
+#include <drm/drm_bridge_connector.h>
 #include "msm_kms.h"
 #include "dsi.h"
 
@@ -689,7 +690,7 @@ struct drm_bridge *msm_dsi_manager_bridge_init(u8 id)
 	bridge = &dsi_bridge->base;
 	bridge->funcs = &dsi_mgr_bridge_funcs;
 
-	ret = drm_bridge_attach(encoder, bridge, NULL, 0);
+	ret = drm_bridge_attach(encoder, bridge, NULL, DRM_BRIDGE_ATTACH_NO_CONNECTOR);
 	if (ret)
 		goto fail;
 
@@ -709,7 +710,6 @@ struct drm_connector *msm_dsi_manager_ext_bridge_init(u8 id)
 	struct drm_encoder *encoder;
 	struct drm_bridge *int_bridge, *ext_bridge;
 	struct drm_connector *connector;
-	struct list_head *connector_list;
 
 	int_bridge = msm_dsi->bridge;
 	ext_bridge = msm_dsi->external_bridge =
@@ -717,22 +717,21 @@ struct drm_connector *msm_dsi_manager_ext_bridge_init(u8 id)
 
 	encoder = msm_dsi->encoder;
 
-	/* link the internal dsi bridge to the external bridge */
-	drm_bridge_attach(encoder, ext_bridge, int_bridge, 0);
-
-	/*
-	 * we need the drm_connector created by the external bridge
-	 * driver (or someone else) to feed it to our driver's
-	 * priv->connector[] list, mainly for msm_fbdev_init()
+	/* link the internal dsi bridge to the external bridge and attach
+	 * the connector, we are supporting DRM_BRIDGE_ATTACH_NO_CONNECTOR
+	 * so always create connector
 	 */
-	connector_list = &dev->mode_config.connector_list;
+	drm_bridge_attach(encoder, ext_bridge, int_bridge, DRM_BRIDGE_ATTACH_NO_CONNECTOR);
 
-	list_for_each_entry(connector, connector_list, head) {
-		if (drm_connector_has_possible_encoder(connector, encoder))
-			return connector;
+	connector = drm_bridge_connector_init(dev, encoder);
+	if (IS_ERR(connector)) {
+		DRM_DEV_ERROR(dev->dev, "drm_bridge_connector_init failed: %ld\n",
+			      PTR_ERR(connector));
+		return ERR_PTR(-ENODEV);
 	}
 
-	return ERR_PTR(-ENODEV);
+	drm_connector_attach_encoder(connector, msm_dsi->encoder);
+	return connector;
 }
 
 void msm_dsi_manager_bridge_destroy(struct drm_bridge *bridge)
-- 
2.26.2