Message-ID: <20250407-drm-bridge-convert-to-alloc-api-v1-34-42113ff8d9c0@bootlin.com>
Date: Mon,  7 Apr 2025 17:27:39 +0200
From: Luca Ceresoli <luca.ceresoli@...tlin.com>
To: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	Andrzej Hajda <andrzej.hajda@...el.com>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Robert Foss <rfoss@...nel.org>,
	Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
	Jonas Karlman <jonas@...boo.se>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	Jagan Teki <jagan@...rulasolutions.com>,
	Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>,
	Douglas Anderson <dianders@...omium.org>,
	Chun-Kuang Hu <chunkuang.hu@...nel.org>,
	Krzysztof Kozlowski <krzk@...nel.org>,
	Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc: Luca Ceresoli <luca.ceresoli@...tlin.com>,
	Anusha Srivatsa <asrivats@...hat.com>,
	Paul Kocialkowski <paulk@...-base.io>,
	Dmitry Baryshkov <lumag@...nel.org>,
	Hervé Codina <herve.codina@...tlin.com>,
	Hui Pu <Hui.Pu@...ealthcare.com>,
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
	dri-devel@...ts.freedesktop.org,
	asahi@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	chrome-platform@...ts.linux.dev,
	imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org,
	linux-amlogic@...ts.infradead.org,
	linux-renesas-soc@...r.kernel.org,
	platform-driver-x86@...r.kernel.org,
	linux-samsung-soc@...r.kernel.org,
	linux-arm-msm@...r.kernel.org,
	freedreno@...ts.freedesktop.org,
	linux-stm32@...md-mailman.stormreply.com
Subject: [PATCH 34/34] drm/bridge: panel: convert to devm_drm_bridge_alloc() API

This is the new API for allocating DRM bridges.

The devm lifetime management of this driver is peculiar. The underlying
device for the panel_bridge is the panel, and the devm lifetime is tied the
panel device (panel->dev). However the panel_bridge allocation is not
performed by the panel driver, but rather by a separate entity (typically
the previous bridge in the encoder chain).

Thus when that separate entoty is destroyed, the panel_bridge is not
removed automatically by devm, so it is rather done explicitly by calling
drm_panel_bridge_remove(). This is the function that does devm_kfree() the
panel_bridge in current code, so update it as well to put the bridge
reference instead.

Signed-off-by: Luca Ceresoli <luca.ceresoli@...tlin.com>
---

To: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
To: Maxime Ripard <mripard@...nel.org>
To: Thomas Zimmermann <tzimmermann@...e.de>
To: David Airlie <airlied@...il.com>
To: Simona Vetter <simona@...ll.ch>
To: Andrzej Hajda <andrzej.hajda@...el.com>
To: Neil Armstrong <neil.armstrong@...aro.org>
To: Robert Foss <rfoss@...nel.org>
To: Laurent Pinchart <Laurent.pinchart@...asonboard.com>
To: Jonas Karlman <jonas@...boo.se>
To: Jernej Skrabec <jernej.skrabec@...il.com>
To: Jagan Teki <jagan@...rulasolutions.com>
To: Shawn Guo <shawnguo@...nel.org>
To: Sascha Hauer <s.hauer@...gutronix.de>
To: Pengutronix Kernel Team <kernel@...gutronix.de>
To: Fabio Estevam <festevam@...il.com>
To: Douglas Anderson <dianders@...omium.org>
To: Chun-Kuang Hu <chunkuang.hu@...nel.org>
To: Krzysztof Kozlowski <krzk@...nel.org>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc: Anusha Srivatsa <asrivats@...hat.com>
Cc: Paul Kocialkowski <paulk@...-base.io>
Cc: Dmitry Baryshkov <lumag@...nel.org>
Cc: Hervé Codina <herve.codina@...tlin.com>
Cc: Hui Pu <Hui.Pu@...ealthcare.com>
Cc: Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Cc: dri-devel@...ts.freedesktop.org
Cc: asahi@...ts.linux.dev
Cc: linux-kernel@...r.kernel.org
Cc: chrome-platform@...ts.linux.dev
Cc: imx@...ts.linux.dev
Cc: linux-arm-kernel@...ts.infradead.org
Cc: linux-mediatek@...ts.infradead.org
Cc: linux-amlogic@...ts.infradead.org
Cc: linux-renesas-soc@...r.kernel.org
Cc: platform-driver-x86@...r.kernel.org
Cc: linux-samsung-soc@...r.kernel.org
Cc: linux-arm-msm@...r.kernel.org
Cc: freedreno@...ts.freedesktop.org
Cc: linux-stm32@...md-mailman.stormreply.com
---
 drivers/gpu/drm/bridge/panel.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/bridge/panel.c b/drivers/gpu/drm/bridge/panel.c
index 79b009ab9396048eac57ad47631a902e949d77c6..ddd1e91970d09b93aa64f50cd9155939a12a2c6f 100644
--- a/drivers/gpu/drm/bridge/panel.c
+++ b/drivers/gpu/drm/bridge/panel.c
@@ -287,15 +287,14 @@ struct drm_bridge *drm_panel_bridge_add_typed(struct drm_panel *panel,
 	if (!panel)
 		return ERR_PTR(-EINVAL);
 
-	panel_bridge = devm_kzalloc(panel->dev, sizeof(*panel_bridge),
-				    GFP_KERNEL);
-	if (!panel_bridge)
-		return ERR_PTR(-ENOMEM);
+	panel_bridge = devm_drm_bridge_alloc(panel->dev, struct panel_bridge, bridge,
+					     &panel_bridge_bridge_funcs);
+	if (IS_ERR(panel_bridge))
+		return (void *)panel_bridge;
 
 	panel_bridge->connector_type = connector_type;
 	panel_bridge->panel = panel;
 
-	panel_bridge->bridge.funcs = &panel_bridge_bridge_funcs;
 	panel_bridge->bridge.of_node = panel->dev->of_node;
 	panel_bridge->bridge.ops = DRM_BRIDGE_OP_MODES;
 	panel_bridge->bridge.type = connector_type;
@@ -327,7 +326,7 @@ void drm_panel_bridge_remove(struct drm_bridge *bridge)
 	panel_bridge = drm_bridge_to_panel_bridge(bridge);
 
 	drm_bridge_remove(bridge);
-	devm_kfree(panel_bridge->panel->dev, bridge);
+	devm_drm_put_bridge(panel_bridge->panel->dev, bridge);
 }
 EXPORT_SYMBOL(drm_panel_bridge_remove);
 

-- 
2.49.0

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