1 files changed, 44 insertions, 24 deletions

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
index 6b268f9445b3..e44e18a0112a 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
@@ -246,6 +246,7 @@ struct dw_mipi_dsi {
 
 	struct clk *pclk;
 
+	bool device_found;
 	unsigned int lane_mbps; /* per lane */
 	u32 channel;
 	u32 lanes;
@@ -309,13 +310,37 @@ static inline u32 dsi_read(struct dw_mipi_dsi *dsi, u32 reg)
 	return readl(dsi->base + reg);
 }
 
+static int dw_mipi_dsi_panel_or_bridge(struct dw_mipi_dsi *dsi,
+				       struct device_node *node)
+{
+	struct drm_bridge *bridge;
+	struct drm_panel *panel;
+	int ret;
+
+	ret = drm_of_find_panel_or_bridge(node, 1, 0, &panel, &bridge);
+	if (ret)
+		return ret;
+
+	if (panel) {
+		bridge = drm_panel_bridge_add_typed(panel,
+						    DRM_MODE_CONNECTOR_DSI);
+		if (IS_ERR(bridge))
+			return PTR_ERR(bridge);
+	}
+
+	dsi->panel_bridge = bridge;
+
+	if (!dsi->panel_bridge)
+		return -EPROBE_DEFER;
+
+	return 0;
+}
+
 static int dw_mipi_dsi_host_attach(struct mipi_dsi_host *host,
 				   struct mipi_dsi_device *device)
 {
 	struct dw_mipi_dsi *dsi = host_to_dsi(host);
 	const struct dw_mipi_dsi_plat_data *pdata = dsi->plat_data;
-	struct drm_bridge *bridge;
-	struct drm_panel *panel;
 	int ret;
 
 	if (device->lanes > dsi->plat_data->max_data_lanes) {
@@ -329,22 +354,14 @@ static int dw_mipi_dsi_host_attach(struct mipi_dsi_host *host,
 	dsi->format = device->format;
 	dsi->mode_flags = device->mode_flags;
 
-	ret = drm_of_find_panel_or_bridge(host->dev->of_node, 1, 0,
-					  &panel, &bridge);
-	if (ret)
-		return ret;
+	if (!dsi->device_found) {
+		ret = dw_mipi_dsi_panel_or_bridge(dsi, host->dev->of_node);
+		if (ret)
+			return ret;
 
-	if (panel) {
-		bridge = drm_panel_bridge_add_typed(panel,
-						    DRM_MODE_CONNECTOR_DSI);
-		if (IS_ERR(bridge))
-			return PTR_ERR(bridge);
+		dsi->device_found = true;
 	}
 
-	dsi->panel_bridge = bridge;
-
-	drm_bridge_add(&dsi->bridge);
-
 	if (pdata->host_ops && pdata->host_ops->attach) {
 		ret = pdata->host_ops->attach(pdata->priv_data, device);
 		if (ret < 0)
@@ -999,6 +1016,16 @@ static int dw_mipi_dsi_bridge_attach(struct drm_bridge *bridge,
 	/* Set the encoder type as caller does not know it */
 	bridge->encoder->encoder_type = DRM_MODE_ENCODER_DSI;
 
+	if (!dsi->device_found) {
+		int ret;
+
+		ret = dw_mipi_dsi_panel_or_bridge(dsi, dsi->dev->of_node);
+		if (ret)
+			return ret;
+
+		dsi->device_found = true;
+	}
+
 	/* Attach the panel-bridge to the dsi bridge */
 	return drm_bridge_attach(bridge->encoder, dsi->panel_bridge, bridge,
 				 flags);
@@ -1181,6 +1208,7 @@ __dw_mipi_dsi_probe(struct platform_device *pdev,
 #ifdef CONFIG_OF
 	dsi->bridge.of_node = pdev->dev.of_node;
 #endif
+	drm_bridge_add(&dsi->bridge);
 
 	return dsi;
 }
@@ -1229,15 +1257,7 @@ EXPORT_SYMBOL_GPL(dw_mipi_dsi_remove);
  */
 int dw_mipi_dsi_bind(struct dw_mipi_dsi *dsi, struct drm_encoder *encoder)
 {
-	int ret;
-
-	ret = drm_bridge_attach(encoder, &dsi->bridge, NULL, 0);
-	if (ret) {
-		DRM_ERROR("Failed to initialize bridge with drm\n");
-		return ret;
-	}
-
-	return ret;
+	return drm_bridge_attach(encoder, &dsi->bridge, NULL, 0);
 }
 EXPORT_SYMBOL_GPL(dw_mipi_dsi_bind);