drm/msm/hdmi: switch to devm_drm_bridge_add()

Make MSM HDMI driver use devm_drm_bridge_add() instead of plain
drm_bridge_add(). As the driver doesn't require any additional cleanup,
stop adding created bridge to the priv->bridges array.
Reviewed-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/561635/Signed-off-by: Rob Clark <robdclark@chromium.org>

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

@@ -160,24 +160,16 @@ static int msm_hdmi_init(struct hdmi *hdmi)
 int msm_hdmi_modeset_init(struct hdmi *hdmi,
 		struct drm_device *dev, struct drm_encoder *encoder)
 {
-	struct msm_drm_private *priv = dev->dev_private;
 	int ret;
 
-	if (priv->num_bridges == ARRAY_SIZE(priv->bridges)) {
-		DRM_DEV_ERROR(dev->dev, "too many bridges\n");
-		return -ENOSPC;
-	}
-
 	hdmi->dev = dev;
 	hdmi->encoder = encoder;
 
 	hdmi_audio_infoframe_init(&hdmi->audio.infoframe);
 
-	hdmi->bridge = msm_hdmi_bridge_init(hdmi);
-	if (IS_ERR(hdmi->bridge)) {
-		ret = PTR_ERR(hdmi->bridge);
+	ret = msm_hdmi_bridge_init(hdmi);
+	if (ret) {
 		DRM_DEV_ERROR(dev->dev, "failed to create HDMI bridge: %d\n", ret);
-		hdmi->bridge = NULL;
 		goto fail;
 	}
 
@@ -215,16 +207,9 @@ int msm_hdmi_modeset_init(struct hdmi *hdmi,
 		goto fail;
 	}
 
-	priv->bridges[priv->num_bridges++]       = hdmi->bridge;
-
 	return 0;
 
 fail:
-	/* bridge is normally destroyed by drm: */
-	if (hdmi->bridge) {
-		msm_hdmi_bridge_destroy(hdmi->bridge);
-		hdmi->bridge = NULL;
-	}
 	if (hdmi->connector) {
 		hdmi->connector->funcs->destroy(hdmi->connector);
 		hdmi->connector = NULL;
@@ -395,6 +380,9 @@ static void msm_hdmi_unbind(struct device *dev, struct device *master,
 		if (priv->hdmi->audio_pdev)
 			platform_device_unregister(priv->hdmi->audio_pdev);
 
+		if (priv->hdmi->bridge)
+			msm_hdmi_hpd_disable(priv->hdmi);
+
 		msm_hdmi_destroy(priv->hdmi);
 		priv->hdmi = NULL;
 	}

drivers/gpu/drm/msm/hdmi/hdmi.h

@@ -224,14 +224,13 @@ void msm_hdmi_audio_set_sample_rate(struct hdmi *hdmi, int rate);
  * hdmi bridge:
  */
 
-struct drm_bridge *msm_hdmi_bridge_init(struct hdmi *hdmi);
-void msm_hdmi_bridge_destroy(struct drm_bridge *bridge);
+int msm_hdmi_bridge_init(struct hdmi *hdmi);
 
 void msm_hdmi_hpd_irq(struct drm_bridge *bridge);
 enum drm_connector_status msm_hdmi_bridge_detect(
 		struct drm_bridge *bridge);
 int msm_hdmi_hpd_enable(struct drm_bridge *bridge);
-void msm_hdmi_hpd_disable(struct hdmi_bridge *hdmi_bridge);
+void msm_hdmi_hpd_disable(struct hdmi *hdmi);
 
 /*
  * i2c adapter for ddc:

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

@@ -11,14 +11,6 @@
 #include "msm_kms.h"
 #include "hdmi.h"
 
-void msm_hdmi_bridge_destroy(struct drm_bridge *bridge)
-{
-	struct hdmi_bridge *hdmi_bridge = to_hdmi_bridge(bridge);
-
-	msm_hdmi_hpd_disable(hdmi_bridge);
-	drm_bridge_remove(bridge);
-}
-
 static void msm_hdmi_power_on(struct drm_bridge *bridge)
 {
 	struct drm_device *dev = bridge->dev;
@@ -317,7 +309,7 @@ msm_hdmi_hotplug_work(struct work_struct *work)
 }
 
 /* initialize bridge */
-struct drm_bridge *msm_hdmi_bridge_init(struct hdmi *hdmi)
+int msm_hdmi_bridge_init(struct hdmi *hdmi)
 {
 	struct drm_bridge *bridge = NULL;
 	struct hdmi_bridge *hdmi_bridge;
@@ -325,10 +317,8 @@ struct drm_bridge *msm_hdmi_bridge_init(struct hdmi *hdmi)
 
 	hdmi_bridge = devm_kzalloc(hdmi->dev->dev,
 			sizeof(*hdmi_bridge), GFP_KERNEL);
-	if (!hdmi_bridge) {
-		ret = -ENOMEM;
-		goto fail;
-	}
+	if (!hdmi_bridge)
+		return -ENOMEM;
 
 	hdmi_bridge->hdmi = hdmi;
 	INIT_WORK(&hdmi_bridge->hpd_work, msm_hdmi_hotplug_work);
@@ -341,17 +331,15 @@ struct drm_bridge *msm_hdmi_bridge_init(struct hdmi *hdmi)
 		DRM_BRIDGE_OP_DETECT |
 		DRM_BRIDGE_OP_EDID;
 
-	drm_bridge_add(bridge);
+	ret = devm_drm_bridge_add(&hdmi->pdev->dev, bridge);
+	if (ret)
+		return ret;
 
 	ret = drm_bridge_attach(hdmi->encoder, bridge, NULL, DRM_BRIDGE_ATTACH_NO_CONNECTOR);
 	if (ret)
-		goto fail;
+		return ret;
 
-	return bridge;
+	hdmi->bridge = bridge;
 
-fail:
-	if (bridge)
-		msm_hdmi_bridge_destroy(bridge);
-
-	return ERR_PTR(ret);
+	return 0;
 }

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

@@ -147,9 +147,8 @@ int msm_hdmi_hpd_enable(struct drm_bridge *bridge)
 	return ret;
 }
 
-void msm_hdmi_hpd_disable(struct hdmi_bridge *hdmi_bridge)
+void msm_hdmi_hpd_disable(struct hdmi *hdmi)
 {
-	struct hdmi *hdmi = hdmi_bridge->hdmi;
 	const struct hdmi_platform_config *config = hdmi->config;
 	struct device *dev = &hdmi->pdev->dev;
 	int ret;