[PATCH RFC v2 10/19] drm/mcde: dsi: don't create a panel_bridge

[Luca Ceresoli <luca.ceresoli@bootlin.com>]

Now a panel_bridge is automatically created for every drm_panel, so this
code (similar to an open-coded variant of drm_of_find_panel_or_bridge())
would lead to creating a second bridge for the same panel.

Update and simplify the code by just getting a reference to the
already-existing bridge.

Also keep the "connected to non-panel bridge (unsupported)\n" error logic
by using the drm_bridge_is_panel() function.

Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
---
 drivers/gpu/drm/mcde/Kconfig    |  1 -
 drivers/gpu/drm/mcde/mcde_dsi.c | 41 +++++++++--------------------------------
 2 files changed, 9 insertions(+), 33 deletions(-)

diff --git a/drivers/gpu/drm/mcde/Kconfig b/drivers/gpu/drm/mcde/Kconfig
index 6ebfb930cbfa..81e7d3796c06 100644
--- a/drivers/gpu/drm/mcde/Kconfig
+++ b/drivers/gpu/drm/mcde/Kconfig
@@ -10,7 +10,6 @@ config DRM_MCDE
 	select DRM_MIPI_DSI
 	select DRM_BRIDGE
 	select DRM_PANEL
-	select DRM_PANEL_BRIDGE
 	select DRM_KMS_HELPER
 	select DRM_GEM_DMA_HELPER
 	help
diff --git a/drivers/gpu/drm/mcde/mcde_dsi.c b/drivers/gpu/drm/mcde/mcde_dsi.c
index 747886dfa17a..c36885f5f275 100644
--- a/drivers/gpu/drm/mcde/mcde_dsi.c
+++ b/drivers/gpu/drm/mcde/mcde_dsi.c
@@ -36,7 +36,6 @@ struct mcde_dsi {
 	struct device *dev;
 	struct mcde *mcde;
 	struct drm_bridge bridge;
-	struct drm_panel *panel;
 	struct mipi_dsi_host dsi_host;
 	struct mipi_dsi_device *mdsi;
 	const struct drm_display_mode *mode;
@@ -1073,7 +1072,6 @@ static int mcde_dsi_bind(struct device *dev, struct device *master,
 	struct drm_device *drm = data;
 	struct mcde *mcde = to_mcde(drm);
 	struct mcde_dsi *d = dev_get_drvdata(dev);
-	struct drm_panel *panel = NULL;
 	struct drm_bridge *bridge __free(drm_bridge_put) = NULL;
 
 	if (!of_get_available_child_count(dev->of_node)) {
@@ -1101,40 +1099,21 @@ static int mcde_dsi_bind(struct device *dev, struct device *master,
 
 	/* Look for a panel as a child to this node */
 	for_each_available_child_of_node_scoped(dev->of_node, child) {
-		panel = of_drm_find_panel(child);
-		if (IS_ERR(panel)) {
-			dev_err(dev, "failed to find panel try bridge (%ld)\n",
-				PTR_ERR(panel));
-			panel = NULL;
-
-			bridge = of_drm_find_and_get_bridge(child);
-			if (!bridge) {
-				dev_err(dev, "failed to find bridge\n");
-				return -EINVAL;
-			}
+		bridge = of_drm_find_and_get_bridge(child);
+		if (!bridge) {
+			dev_err(dev, "failed to find bridge\n");
+			return -EINVAL;
 		}
 
-		if (panel || bridge)
-			break;
+		break;
 	}
-	if (panel) {
-		bridge = drm_panel_bridge_add_typed(panel,
-						    DRM_MODE_CONNECTOR_DSI);
-		drm_panel_put(panel);
-		if (IS_ERR(bridge)) {
-			dev_err(dev, "error adding panel bridge\n");
-			return PTR_ERR(bridge);
-		}
-		drm_bridge_get(bridge);
-		dev_info(dev, "connected to panel\n");
-		d->panel = panel;
-	} else if (bridge) {
+	if (!bridge) {
+		dev_err(dev, "no bridge\n");
+		return -ENODEV;
+	} else if (!drm_bridge_is_panel(bridge)) {
 		/* TODO: AV8100 HDMI encoder goes here for example */
 		dev_info(dev, "connected to non-panel bridge (unsupported)\n");
 		return -ENODEV;
-	} else {
-		dev_err(dev, "no panel or bridge\n");
-		return -ENODEV;
 	}
 
 	d->bridge.next_bridge = drm_bridge_get(bridge);
@@ -1156,8 +1135,6 @@ static void mcde_dsi_unbind(struct device *dev, struct device *master,
 {
 	struct mcde_dsi *d = dev_get_drvdata(dev);
 
-	if (d->panel)
-		drm_panel_bridge_remove(d->bridge.next_bridge);
 	regmap_update_bits(d->prcmu, PRCM_DSI_SW_RESET,
 			   PRCM_DSI_SW_RESET_DSI0_SW_RESETN, 0);
 }

-- 
2.55.0