1 files changed, 63 insertions, 44 deletions

diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
index 781b82c2c579..07af7758066d 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_dsi.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
@@ -255,6 +255,7 @@ struct exynos_dsi {
 	struct mipi_dsi_host dsi_host;
 	struct drm_connector connector;
 	struct drm_panel *panel;
+	struct drm_bridge *out_bridge;
 	struct device *dev;
 
 	void __iomem *reg_base;
@@ -279,7 +280,7 @@ struct exynos_dsi {
 	struct list_head transfer_list;
 
 	const struct exynos_dsi_driver_data *driver_data;
-	struct device_node *bridge_node;
+	struct device_node *in_bridge_node;
 };
 
 #define host_to_dsi(host) container_of(host, struct exynos_dsi, dsi_host)
@@ -1382,29 +1383,37 @@ static void exynos_dsi_enable(struct drm_encoder *encoder)
 		return;
 
 	pm_runtime_get_sync(dsi->dev);
-
 	dsi->state |= DSIM_STATE_ENABLED;
 
-	ret = drm_panel_prepare(dsi->panel);
-	if (ret < 0) {
-		dsi->state &= ~DSIM_STATE_ENABLED;
-		pm_runtime_put_sync(dsi->dev);
-		return;
+	if (dsi->panel) {
+		ret = drm_panel_prepare(dsi->panel);
+		if (ret < 0)
+			goto err_put_sync;
+	} else {
+		drm_bridge_pre_enable(dsi->out_bridge);
 	}
 
 	exynos_dsi_set_display_mode(dsi);
 	exynos_dsi_set_display_enable(dsi, true);
 
-	ret = drm_panel_enable(dsi->panel);
-	if (ret < 0) {
-		dsi->state &= ~DSIM_STATE_ENABLED;
-		exynos_dsi_set_display_enable(dsi, false);
-		drm_panel_unprepare(dsi->panel);
-		pm_runtime_put_sync(dsi->dev);
-		return;
+	if (dsi->panel) {
+		ret = drm_panel_enable(dsi->panel);
+		if (ret < 0)
+			goto err_display_disable;
+	} else {
+		drm_bridge_enable(dsi->out_bridge);
 	}
 
 	dsi->state |= DSIM_STATE_VIDOUT_AVAILABLE;
+	return;
+
+err_display_disable:
+	exynos_dsi_set_display_enable(dsi, false);
+	drm_panel_unprepare(dsi->panel);
+
+err_put_sync:
+	dsi->state &= ~DSIM_STATE_ENABLED;
+	pm_runtime_put(dsi->dev);
 }
 
 static void exynos_dsi_disable(struct drm_encoder *encoder)
@@ -1417,11 +1426,11 @@ static void exynos_dsi_disable(struct drm_encoder *encoder)
 	dsi->state &= ~DSIM_STATE_VIDOUT_AVAILABLE;
 
 	drm_panel_disable(dsi->panel);
+	drm_bridge_disable(dsi->out_bridge);
 	exynos_dsi_set_display_enable(dsi, false);
 	drm_panel_unprepare(dsi->panel);
-
+	drm_bridge_post_disable(dsi->out_bridge);
 	dsi->state &= ~DSIM_STATE_ENABLED;
-
 	pm_runtime_put_sync(dsi->dev);
 }
 
@@ -1499,7 +1508,30 @@ static int exynos_dsi_host_attach(struct mipi_dsi_host *host,
 				  struct mipi_dsi_device *device)
 {
 	struct exynos_dsi *dsi = host_to_dsi(host);
-	struct drm_device *drm = dsi->connector.dev;
+	struct drm_encoder *encoder = &dsi->encoder;
+	struct drm_device *drm = encoder->dev;
+	struct drm_bridge *out_bridge;
+
+	out_bridge  = of_drm_find_bridge(device->dev.of_node);
+	if (out_bridge) {
+		drm_bridge_attach(encoder, out_bridge, NULL);
+		dsi->out_bridge = out_bridge;
+		encoder->bridge = NULL;
+	} else {
+		int ret = exynos_dsi_create_connector(encoder);
+
+		if (ret) {
+			DRM_ERROR("failed to create connector ret = %d\n", ret);
+			drm_encoder_cleanup(encoder);
+			return ret;
+		}
+
+		dsi->panel = of_drm_find_panel(device->dev.of_node);
+		if (dsi->panel) {
+			drm_panel_attach(dsi->panel, &dsi->connector);
+			dsi->connector.status = connector_status_connected;
+		}
+	}
 
 	/*
 	 * This is a temporary solution and should be made by more generic way.
@@ -1518,14 +1550,6 @@ static int exynos_dsi_host_attach(struct mipi_dsi_host *host,
 	dsi->lanes = device->lanes;
 	dsi->format = device->format;
 	dsi->mode_flags = device->mode_flags;
-	dsi->panel = of_drm_find_panel(device->dev.of_node);
-	if (IS_ERR(dsi->panel))
-		dsi->panel = NULL;
-
-	if (dsi->panel) {
-		drm_panel_attach(dsi->panel, &dsi->connector);
-		dsi->connector.status = connector_status_connected;
-	}
 	exynos_drm_crtc_get_by_type(drm, EXYNOS_DISPLAY_TYPE_LCD)->i80_mode =
 			!(dsi->mode_flags & MIPI_DSI_MODE_VIDEO);
 
@@ -1541,19 +1565,21 @@ static int exynos_dsi_host_detach(struct mipi_dsi_host *host,
 				  struct mipi_dsi_device *device)
 {
 	struct exynos_dsi *dsi = host_to_dsi(host);
-	struct drm_device *drm = dsi->connector.dev;
-
-	mutex_lock(&drm->mode_config.mutex);
+	struct drm_device *drm = dsi->encoder.dev;
 
 	if (dsi->panel) {
+		mutex_lock(&drm->mode_config.mutex);
 		exynos_dsi_disable(&dsi->encoder);
 		drm_panel_detach(dsi->panel);
 		dsi->panel = NULL;
 		dsi->connector.status = connector_status_disconnected;
+		mutex_unlock(&drm->mode_config.mutex);
+	} else {
+		if (dsi->out_bridge->funcs->detach)
+			dsi->out_bridge->funcs->detach(dsi->out_bridge);
+		dsi->out_bridge = NULL;
 	}
 
-	mutex_unlock(&drm->mode_config.mutex);
-
 	if (drm->mode_config.poll_enabled)
 		drm_kms_helper_hotplug_event(drm);
 
@@ -1634,7 +1660,7 @@ static int exynos_dsi_parse_dt(struct exynos_dsi *dsi)
 	if (ret < 0)
 		return ret;
 
-	dsi->bridge_node = of_graph_get_remote_node(node, DSI_PORT_IN, 0);
+	dsi->in_bridge_node = of_graph_get_remote_node(node, DSI_PORT_IN, 0);
 
 	return 0;
 }
@@ -1645,7 +1671,7 @@ static int exynos_dsi_bind(struct device *dev, struct device *master,
 	struct drm_encoder *encoder = dev_get_drvdata(dev);
 	struct exynos_dsi *dsi = encoder_to_dsi(encoder);
 	struct drm_device *drm_dev = data;
-	struct drm_bridge *bridge;
+	struct drm_bridge *in_bridge;
 	int ret;
 
 	drm_encoder_init(drm_dev, encoder, &exynos_dsi_encoder_funcs,
@@ -1657,17 +1683,10 @@ static int exynos_dsi_bind(struct device *dev, struct device *master,
 	if (ret < 0)
 		return ret;
 
-	ret = exynos_dsi_create_connector(encoder);
-	if (ret) {
-		DRM_ERROR("failed to create connector ret = %d\n", ret);
-		drm_encoder_cleanup(encoder);
-		return ret;
-	}
-
-	if (dsi->bridge_node) {
-		bridge = of_drm_find_bridge(dsi->bridge_node);
-		if (bridge)
-			drm_bridge_attach(encoder, bridge, NULL);
+	if (dsi->in_bridge_node) {
+		in_bridge = of_drm_find_bridge(dsi->in_bridge_node);
+		if (in_bridge)
+			drm_bridge_attach(encoder, in_bridge, NULL);
 	}
 
 	return mipi_dsi_host_register(&dsi->dsi_host);
@@ -1786,7 +1805,7 @@ static int exynos_dsi_remove(struct platform_device *pdev)
 {
 	struct exynos_dsi *dsi = platform_get_drvdata(pdev);
 
-	of_node_put(dsi->bridge_node);
+	of_node_put(dsi->in_bridge_node);
 
 	pm_runtime_disable(&pdev->dev);