drm/msm: Centralize connector registration/unregistration

Move the drm_connector registration from the encoder(HDMI/DSI etc) drivers
to the msm platform driver. This will simplify the task of ensuring that
the connectors are registered only after the drm_device itself is
registered.

The connectors' destroy ops are made to use kzalloc instead of
devm_kzalloc to ensure that that the connectors can be successfully
unregistered when the msm driver module is removed. The memory for the
connectors is unallocated when drm_mode_config_cleanup() is called
during either during an error or during driver remove.
Signed-off-by: Archit Taneja <architt@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>

drivers/gpu/drm/msm/dsi/dsi_manager.c

@@ -198,9 +198,13 @@ static enum drm_connector_status dsi_mgr_connector_detect(
 
 static void dsi_mgr_connector_destroy(struct drm_connector *connector)
 {
+	struct dsi_connector *dsi_connector = to_dsi_connector(connector);
+
 	DBG("");
-	drm_connector_unregister(connector);
+
 	drm_connector_cleanup(connector);
+
+	kfree(dsi_connector);
 }
 
 static void dsi_dual_connector_fix_modes(struct drm_connector *connector)
@@ -538,12 +542,9 @@ struct drm_connector *msm_dsi_manager_connector_init(u8 id)
 	struct dsi_connector *dsi_connector;
 	int ret, i;
 
-	dsi_connector = devm_kzalloc(msm_dsi->dev->dev,
-				sizeof(*dsi_connector), GFP_KERNEL);
-	if (!dsi_connector) {
-		ret = -ENOMEM;
-		goto fail;
-	}
+	dsi_connector = kzalloc(sizeof(*dsi_connector), GFP_KERNEL);
+	if (!dsi_connector)
+		return ERR_PTR(-ENOMEM);
 
 	dsi_connector->id = id;
 
@@ -552,7 +553,7 @@ struct drm_connector *msm_dsi_manager_connector_init(u8 id)
 	ret = drm_connector_init(msm_dsi->dev, connector,
 			&dsi_mgr_connector_funcs, DRM_MODE_CONNECTOR_DSI);
 	if (ret)
-		goto fail;
+		return ERR_PTR(ret);
 
 	drm_connector_helper_add(connector, &dsi_mgr_conn_helper_funcs);
 
@@ -565,21 +566,11 @@ struct drm_connector *msm_dsi_manager_connector_init(u8 id)
 	connector->interlace_allowed = 0;
 	connector->doublescan_allowed = 0;
 
-	ret = drm_connector_register(connector);
-	if (ret)
-		goto fail;
-
 	for (i = 0; i < MSM_DSI_ENCODER_NUM; i++)
 		drm_mode_connector_attach_encoder(connector,
 						msm_dsi->encoders[i]);
 
 	return connector;
-
-fail:
-	if (connector)
-		dsi_mgr_connector_destroy(connector);
-
-	return ERR_PTR(ret);
 }
 
 /* initialize bridge */

drivers/gpu/drm/msm/edp/edp_connector.c

@@ -37,7 +37,7 @@ static void edp_connector_destroy(struct drm_connector *connector)
 	struct edp_connector *edp_connector = to_edp_connector(connector);
 
 	DBG("");
-	drm_connector_unregister(connector);
+
 	drm_connector_cleanup(connector);
 
 	kfree(edp_connector);
@@ -124,10 +124,8 @@ struct drm_connector *msm_edp_connector_init(struct msm_edp *edp)
 	int ret;
 
 	edp_connector = kzalloc(sizeof(*edp_connector), GFP_KERNEL);
-	if (!edp_connector) {
-		ret = -ENOMEM;
-		goto fail;
-	}
+	if (!edp_connector)
+		return ERR_PTR(-ENOMEM);
 
 	edp_connector->edp = edp;
 
@@ -136,7 +134,7 @@ struct drm_connector *msm_edp_connector_init(struct msm_edp *edp)
 	ret = drm_connector_init(edp->dev, connector, &edp_connector_funcs,
 			DRM_MODE_CONNECTOR_eDP);
 	if (ret)
-		goto fail;
+		return ERR_PTR(ret);
 
 	drm_connector_helper_add(connector, &edp_connector_helper_funcs);
 
@@ -147,17 +145,7 @@ struct drm_connector *msm_edp_connector_init(struct msm_edp *edp)
 	connector->interlace_allowed = false;
 	connector->doublescan_allowed = false;
 
-	ret = drm_connector_register(connector);
-	if (ret)
-		goto fail;
-
 	drm_mode_connector_attach_encoder(connector, edp->encoder);
 
 	return connector;
-
-fail:
-	if (connector)
-		edp_connector_destroy(connector);
-
-	return ERR_PTR(ret);
 }

drivers/gpu/drm/msm/hdmi/hdmi_connector.c

@@ -346,7 +346,6 @@ static void hdmi_connector_destroy(struct drm_connector *connector)
 
 	hdp_disable(hdmi_connector);
 
-	drm_connector_unregister(connector);
 	drm_connector_cleanup(connector);
 
 	kfree(hdmi_connector);
@@ -438,10 +437,8 @@ struct drm_connector *msm_hdmi_connector_init(struct hdmi *hdmi)
 	int ret;
 
 	hdmi_connector = kzalloc(sizeof(*hdmi_connector), GFP_KERNEL);
-	if (!hdmi_connector) {
-		ret = -ENOMEM;
-		goto fail;
-	}
+	if (!hdmi_connector)
+		return ERR_PTR(-ENOMEM);
 
 	hdmi_connector->hdmi = hdmi;
 	INIT_WORK(&hdmi_connector->hpd_work, msm_hdmi_hotplug_work);
@@ -458,21 +455,13 @@ struct drm_connector *msm_hdmi_connector_init(struct hdmi *hdmi)
 	connector->interlace_allowed = 0;
 	connector->doublescan_allowed = 0;
 
-	drm_connector_register(connector);
-
 	ret = hpd_enable(hdmi_connector);
 	if (ret) {
 		dev_err(&hdmi->pdev->dev, "failed to enable HPD: %d\n", ret);
-		goto fail;
+		return ERR_PTR(ret);
 	}
 
 	drm_mode_connector_attach_encoder(connector, hdmi->encoder);
 
 	return connector;
-
-fail:
-	if (connector)
-		hdmi_connector_destroy(connector);
-
-	return ERR_PTR(ret);
 }

drivers/gpu/drm/msm/mdp/mdp4/mdp4_lvds_connector.c

@@ -48,7 +48,6 @@ static void mdp4_lvds_connector_destroy(struct drm_connector *connector)
 	struct mdp4_lvds_connector *mdp4_lvds_connector =
 			to_mdp4_lvds_connector(connector);
 
-	drm_connector_unregister(connector);
 	drm_connector_cleanup(connector);
 
 	kfree(mdp4_lvds_connector);
@@ -121,13 +120,10 @@ struct drm_connector *mdp4_lvds_connector_init(struct drm_device *dev,
 {
 	struct drm_connector *connector = NULL;
 	struct mdp4_lvds_connector *mdp4_lvds_connector;
-	int ret;
 
 	mdp4_lvds_connector = kzalloc(sizeof(*mdp4_lvds_connector), GFP_KERNEL);
-	if (!mdp4_lvds_connector) {
-		ret = -ENOMEM;
-		goto fail;
-	}
+	if (!mdp4_lvds_connector)
+		return ERR_PTR(-ENOMEM);
 
 	mdp4_lvds_connector->encoder = encoder;
 	mdp4_lvds_connector->panel_node = panel_node;
@@ -143,15 +139,7 @@ struct drm_connector *mdp4_lvds_connector_init(struct drm_device *dev,
 	connector->interlace_allowed = 0;
 	connector->doublescan_allowed = 0;
 
-	drm_connector_register(connector);
-
 	drm_mode_connector_attach_encoder(connector, encoder);
 
 	return connector;
-
-fail:
-	if (connector)
-		mdp4_lvds_connector_destroy(connector);
-
-	return ERR_PTR(ret);
 }

drivers/gpu/drm/msm/msm_drv.c

@@ -199,6 +199,8 @@ static int msm_unload(struct drm_device *dev)
 
 	drm_kms_helper_poll_fini(dev);
 
+	drm_connector_unregister_all(dev);
+
 #ifdef CONFIG_DRM_FBDEV_EMULATION
 	if (fbdev && priv->fbdev)
 		msm_fbdev_free(dev);
@@ -414,6 +416,12 @@ static int msm_load(struct drm_device *dev, unsigned long flags)
 		goto fail;
 	}
 
+	ret = drm_connector_register_all(dev);
+	if (ret) {
+		dev_err(dev->dev, "failed to register connectors\n");
+		goto fail;
+	}
+
 	drm_mode_config_reset(dev);
 
 #ifdef CONFIG_DRM_FBDEV_EMULATION