drm/tilcdc changes to v4.17

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Merge tag 'tilcdc-4.17' of https://github.com/jsarha/linux into drm-next

drm/tilcdc changes to v4.17

* tag 'tilcdc-4.17' of https://github.com/jsarha/linux:
  drm/tilcdc: tilcdc_panel: Rename device from "panel" to "tilcdc-panel"
  drm/tilcdc: Add support for drm panels
  drm/tilcdc: panel: Use common error handling code in of_get_panel_info()
  drm/tilcdc: Delete an error message for a failed memory allocation in seven functions

drivers/gpu/drm/tilcdc/Kconfig

@@ -4,6 +4,8 @@ config DRM_TILCDC
 	select DRM_KMS_HELPER
 	select DRM_KMS_CMA_HELPER
 	select DRM_GEM_CMA_HELPER
+	select DRM_BRIDGE
+	select DRM_PANEL_BRIDGE
 	select VIDEOMODE_HELPERS
 	select BACKLIGHT_CLASS_DEVICE
 	select BACKLIGHT_LCD_SUPPORT

drivers/gpu/drm/tilcdc/tilcdc_crtc.c

@@ -994,10 +994,8 @@ int tilcdc_crtc_create(struct drm_device *dev)
 	int ret;
 
 	tilcdc_crtc = devm_kzalloc(dev->dev, sizeof(*tilcdc_crtc), GFP_KERNEL);
-	if (!tilcdc_crtc) {
-		dev_err(dev->dev, "allocation failed\n");
+	if (!tilcdc_crtc)
 		return -ENOMEM;
-	}
 
 	init_completion(&tilcdc_crtc->palette_loaded);
 	tilcdc_crtc->palette_base = dmam_alloc_coherent(dev->dev,

drivers/gpu/drm/tilcdc/tilcdc_drv.c

@@ -233,10 +233,8 @@ static int tilcdc_init(struct drm_driver *ddrv, struct device *dev)
 	int ret;
 
 	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
-	if (!priv) {
-		dev_err(dev, "failed to allocate private data\n");
+	if (!priv)
 		return -ENOMEM;
-	}
 
 	ddev = drm_dev_alloc(ddrv, dev);
 	if (IS_ERR(ddev))

drivers/gpu/drm/tilcdc/tilcdc_external.c

@@ -188,18 +188,16 @@ int tilcdc_attach_bridge(struct drm_device *ddev, struct drm_bridge *bridge)
 int tilcdc_attach_external_device(struct drm_device *ddev)
 {
 	struct tilcdc_drm_private *priv = ddev->dev_private;
-	struct device_node *remote_node;
 	struct drm_bridge *bridge;
+	struct drm_panel *panel;
 	int ret;
 
-	remote_node = of_graph_get_remote_node(ddev->dev->of_node, 0, 0);
-	if (!remote_node)
+	ret = drm_of_find_panel_or_bridge(ddev->dev->of_node, 0, 0,
+					  &panel, &bridge);
+	if (ret == -ENODEV)
 		return 0;
-
-	bridge = of_drm_find_bridge(remote_node);
-	of_node_put(remote_node);
-	if (!bridge)
-		return -EPROBE_DEFER;
+	else if (ret)
+		return ret;
 
 	priv->external_encoder = devm_kzalloc(ddev->dev,
 					      sizeof(*priv->external_encoder),
@@ -215,10 +213,23 @@ int tilcdc_attach_external_device(struct drm_device *ddev)
 		return ret;
 	}
 
+	if (panel) {
+		bridge = devm_drm_panel_bridge_add(ddev->dev, panel,
+						   DRM_MODE_CONNECTOR_DPI);
+		if (IS_ERR(bridge)) {
+			ret = PTR_ERR(bridge);
+			goto err_encoder_cleanup;
+		}
+	}
+
 	ret = tilcdc_attach_bridge(ddev, bridge);
 	if (ret)
-		drm_encoder_cleanup(priv->external_encoder);
+		goto err_encoder_cleanup;
 
+	return 0;
+
+err_encoder_cleanup:
+	drm_encoder_cleanup(priv->external_encoder);
 	return ret;
 }
 

drivers/gpu/drm/tilcdc/tilcdc_panel.c

@@ -101,10 +101,8 @@ static struct drm_encoder *panel_encoder_create(struct drm_device *dev,
 
 	panel_encoder = devm_kzalloc(dev->dev, sizeof(*panel_encoder),
 				     GFP_KERNEL);
-	if (!panel_encoder) {
-		dev_err(dev->dev, "allocation failed\n");
+	if (!panel_encoder)
 		return NULL;
-	}
 
 	panel_encoder->mod = mod;
 
@@ -210,10 +208,8 @@ static struct drm_connector *panel_connector_create(struct drm_device *dev,
 
 	panel_connector = devm_kzalloc(dev->dev, sizeof(*panel_connector),
 				       GFP_KERNEL);
-	if (!panel_connector) {
-		dev_err(dev->dev, "allocation failed\n");
+	if (!panel_connector)
 		return NULL;
-	}
 
 	panel_connector->encoder = encoder;
 	panel_connector->mod = mod;
@@ -293,11 +289,8 @@ static struct tilcdc_panel_info *of_get_panel_info(struct device_node *np)
 	}
 
 	info = kzalloc(sizeof(*info), GFP_KERNEL);
-	if (!info) {
-		pr_err("%s: allocation failed\n", __func__);
-		of_node_put(info_np);
-		return NULL;
-	}
+	if (!info)
+		goto put_node;
 
 	ret |= of_property_read_u32(info_np, "ac-bias", &info->ac_bias);
 	ret |= of_property_read_u32(info_np, "ac-bias-intrpt", &info->ac_bias_intrpt);
@@ -316,11 +309,11 @@ static struct tilcdc_panel_info *of_get_panel_info(struct device_node *np)
 	if (ret) {
 		pr_err("%s: error reading panel-info properties\n", __func__);
 		kfree(info);
-		of_node_put(info_np);
-		return NULL;
+		info = NULL;
 	}
-	of_node_put(info_np);
 
+put_node:
+	of_node_put(info_np);
 	return info;
 }
 
@@ -428,7 +421,7 @@ struct platform_driver panel_driver = {
 	.remove = panel_remove,
 	.driver = {
 		.owner = THIS_MODULE,
-		.name = "panel",
+		.name = "tilcdc-panel",
 		.of_match_table = panel_of_match,
 	},
 };

drivers/gpu/drm/tilcdc/tilcdc_tfp410.c

@@ -111,10 +111,8 @@ static struct drm_encoder *tfp410_encoder_create(struct drm_device *dev,
 
 	tfp410_encoder = devm_kzalloc(dev->dev, sizeof(*tfp410_encoder),
 				      GFP_KERNEL);
-	if (!tfp410_encoder) {
-		dev_err(dev->dev, "allocation failed\n");
+	if (!tfp410_encoder)
 		return NULL;
-	}
 
 	tfp410_encoder->dpms = DRM_MODE_DPMS_OFF;
 	tfp410_encoder->mod = mod;
@@ -224,10 +222,8 @@ static struct drm_connector *tfp410_connector_create(struct drm_device *dev,
 
 	tfp410_connector = devm_kzalloc(dev->dev, sizeof(*tfp410_connector),
 					GFP_KERNEL);
-	if (!tfp410_connector) {
-		dev_err(dev->dev, "allocation failed\n");
+	if (!tfp410_connector)
 		return NULL;
-	}
 
 	tfp410_connector->encoder = encoder;
 	tfp410_connector->mod = mod;