[PATCH 2/2] drm/exynos: mipi-dsi: consider panel driver-deferred probe

[Inki Dae <inki.dae@samsung.com>]

This patch makes sure that mipi dsi driver makes it re-probe
in case that panel driver isn't probed yet.

For this, it checks if panel driver is probed or not before
component_add() is called.

Signed-off-by: Inki Dae <inki.dae@samsung.com>
Acked-by: Kyungmin Park <kyungmin.park@samsung.com>
---
 drivers/gpu/drm/exynos/exynos_drm_dsi.c |   38 +++++++++++++++----------------
 1 file changed, 19 insertions(+), 19 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
index 1421d9b..22503f3 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_dsi.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
@@ -1166,11 +1166,8 @@ exynos_dsi_detect(struct drm_connector *connector, bool force)
 {
 	struct exynos_dsi *dsi = connector_to_dsi(connector);
 
-	if (!dsi->panel) {
-		dsi->panel = of_drm_find_panel(dsi->panel_node);
-		if (dsi->panel)
-			drm_panel_attach(dsi->panel, &dsi->connector);
-	} else if (!dsi->panel_node) {
+	 /* Power off if panel driver is removed. */
+	if (!dsi->panel_node) {
 		struct exynos_drm_display *display;
 
 		display = platform_get_drvdata(to_platform_device(dsi->dev));
@@ -1383,19 +1380,8 @@ static int exynos_dsi_bind(struct device *dev, struct device *master,
 				void *data)
 {
 	struct drm_device *drm_dev = data;
-	struct exynos_dsi *dsi;
-	int ret;
 
-	ret = exynos_drm_create_enc_conn(drm_dev, &exynos_dsi_display);
-	if (ret) {
-		DRM_ERROR("Encoder create [%d] failed with %d\n",
-				exynos_dsi_display.type, ret);
-		return ret;
-	}
-
-	dsi = exynos_dsi_display.ctx;
-
-	return mipi_dsi_host_register(&dsi->dsi_host);
+	return exynos_drm_create_enc_conn(drm_dev, &exynos_dsi_display);
 }
 
 static void exynos_dsi_unbind(struct device *dev, struct device *master,
@@ -1406,8 +1392,6 @@ static void exynos_dsi_unbind(struct device *dev, struct device *master,
 
 	exynos_dsi_dpms(&exynos_dsi_display, DRM_MODE_DPMS_OFF);
 
-	mipi_dsi_host_unregister(&dsi->dsi_host);
-
 	encoder->funcs->destroy(encoder);
 	drm_connector_cleanup(&dsi->connector);
 }
@@ -1502,6 +1486,18 @@ static int exynos_dsi_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, &exynos_dsi_display);
 
+	ret = mipi_dsi_host_register(&dsi->dsi_host);
+	if (ret)
+		goto err_del_component;
+
+	dsi->panel = of_drm_find_panel(dsi->panel_node);
+	if (!dsi->panel) {
+		mipi_dsi_host_unregister(&dsi->dsi_host);
+		return -EPROBE_DEFER;
+	}
+
+	drm_panel_attach(dsi->panel, &dsi->connector);
+
 	ret = component_add(&pdev->dev, &exynos_dsi_component_ops);
 	if (ret)
 		goto err_del_component;
@@ -1515,6 +1511,10 @@ err_del_component:
 
 static int exynos_dsi_remove(struct platform_device *pdev)
 {
+	struct exynos_dsi *dsi = exynos_dsi_display.ctx;
+
+	mipi_dsi_host_unregister(&dsi->dsi_host);
+
 	component_del(&pdev->dev, &exynos_dsi_component_ops);
 	exynos_drm_component_del(&pdev->dev);
 
-- 
1.7.9.5