From: Luca Ceresoli <luca.ceresoli@bootlin.com>
Date: Sat, 31 Jan 2026 15:58:36 +0000 (+0100)
Subject: drm/mcde: dsi: convert to of_drm_find_and_get_bridge()
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a480f5c6f5fa14c954aa8c462302d34223947510;p=thirdparty%2Fkernel%2Flinux.git

drm/mcde: dsi: convert to of_drm_find_and_get_bridge()

of_drm_find_bridge() is deprecated. Move to its replacement
of_drm_find_and_get_bridge() which gets a bridge reference, and ensure it
is put when done.

We need to handle the two cases: when a panel is found and when it isn't,
even though the latter is not supported. So:

 * in case a panel is not found and bridge is, get a reference to the
   found bridge
 * in case a panel is found, get a reference to the panel_bridge when it
   is added, so the following code always get exactly one reference that
   it needs to put

Finally, use the next_bridge pointer in struct drm_bridge in order to
simplify putting the reference.

Reviewed-by: Linus Walleij <linusw@kernel.org>
Link: https://patch.msgid.link/20260131-drm-bridge-alloc-getput-drm_of_find_bridge-4-v2-4-e081bcdc1467@bootlin.com
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
---

diff --git a/drivers/gpu/drm/mcde/mcde_dsi.c b/drivers/gpu/drm/mcde/mcde_dsi.c
index 5893fd2681b32..47d45897ed069 100644
--- a/drivers/gpu/drm/mcde/mcde_dsi.c
+++ b/drivers/gpu/drm/mcde/mcde_dsi.c
@@ -40,7 +40,6 @@ struct mcde_dsi {
 	struct mcde *mcde;
 	struct drm_bridge bridge;
 	struct drm_panel *panel;
-	struct drm_bridge *bridge_out;
 	struct mipi_dsi_host dsi_host;
 	struct mipi_dsi_device *mdsi;
 	const struct drm_display_mode *mode;
@@ -1060,7 +1059,7 @@ static int mcde_dsi_bridge_attach(struct drm_bridge *bridge,
 	}
 
 	/* Attach the DSI bridge to the output (panel etc) bridge */
-	return drm_bridge_attach(encoder, d->bridge_out, bridge, flags);
+	return drm_bridge_attach(encoder, d->bridge.next_bridge, bridge, flags);
 }
 
 static const struct drm_bridge_funcs mcde_dsi_bridge_funcs = {
@@ -1076,7 +1075,7 @@ static int mcde_dsi_bind(struct device *dev, struct device *master,
 	struct mcde_dsi *d = dev_get_drvdata(dev);
 	struct device_node *child;
 	struct drm_panel *panel = NULL;
-	struct drm_bridge *bridge = NULL;
+	struct drm_bridge *bridge __free(drm_bridge_put) = NULL;
 
 	if (!of_get_available_child_count(dev->of_node)) {
 		dev_info(dev, "unused DSI interface\n");
@@ -1109,7 +1108,7 @@ static int mcde_dsi_bind(struct device *dev, struct device *master,
 				PTR_ERR(panel));
 			panel = NULL;
 
-			bridge = of_drm_find_bridge(child);
+			bridge = of_drm_find_and_get_bridge(child);
 			if (!bridge) {
 				dev_err(dev, "failed to find bridge\n");
 				of_node_put(child);
@@ -1129,6 +1128,7 @@ static int mcde_dsi_bind(struct device *dev, struct device *master,
 			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) {
@@ -1140,7 +1140,7 @@ static int mcde_dsi_bind(struct device *dev, struct device *master,
 		return -ENODEV;
 	}
 
-	d->bridge_out = bridge;
+	d->bridge.next_bridge = drm_bridge_get(bridge);
 
 	/* Create a bridge for this DSI channel */
 	d->bridge.of_node = dev->of_node;
@@ -1160,7 +1160,7 @@ 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_out);
+		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);
 }