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Message-ID: <20250407-drm-bridge-convert-to-alloc-api-v1-33-42113ff8d9c0@bootlin.com>
Date: Mon, 7 Apr 2025 17:27:08 +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 33/34] drm/bridge: add devm_drm_put_bridge()
Bridges obtained via devm_drm_bridge_alloc(dev, ...) will be put when the
requesting device (@dev) is removed.
However drivers which obtained them may need to put the obtained reference
explicitly. One such case is if they bind the devm removal action to a
different device than the one implemented by the driver itself and which
might be removed at a different time, such as bridge/panel.c.
Add devm_drm_put_bridge() to manually release a devm-obtained bridge in
such cases.
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/drm_bridge.c | 14 ++++++++++++++
include/drm/drm_bridge.h | 4 ++++
2 files changed, 18 insertions(+)
diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c
index b4c89ec01998b849018ce031c7cd84614e65e710..456363d86080b2a55035c3108c16afa4f9e57e06 100644
--- a/drivers/gpu/drm/drm_bridge.c
+++ b/drivers/gpu/drm/drm_bridge.c
@@ -1392,6 +1392,20 @@ struct drm_bridge *of_drm_find_bridge(struct device_node *np)
EXPORT_SYMBOL(of_drm_find_bridge);
#endif
+/**
+ * devm_drm_put_bridge - Release a bridge reference obtained via devm
+ * @dev: device that got the bridge via devm
+ * @bridge: pointer to a struct drm_bridge obtained via devm
+ *
+ * Same as drm_bridge_put() for bridge pointers obtained via devm functions
+ * such as devm_drm_bridge_alloc().
+ */
+void devm_drm_put_bridge(struct device *dev, struct drm_bridge *bridge)
+{
+ devm_release_action(dev, drm_bridge_put_void, bridge);
+}
+EXPORT_SYMBOL(devm_drm_put_bridge);
+
static void drm_bridge_debugfs_show_bridge(struct drm_printer *p,
struct drm_bridge *bridge,
unsigned int idx)
diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h
index df9bbf6fd1fb522add28b76406b74cdb7391fc57..5b4e5e935a17ba6fc4a6a53ad0a302e249ca418b 100644
--- a/include/drm/drm_bridge.h
+++ b/include/drm/drm_bridge.h
@@ -1167,6 +1167,8 @@ static inline struct drm_bridge *devm_drm_of_get_bridge(struct device *dev,
return ERR_PTR(-ENODEV);
}
+static inline void devm_drm_put_bridge(struct device *dev, struct drm_bridge *bridge) {}
+
static inline struct drm_bridge *drmm_of_get_bridge(struct drm_device *drm,
struct device_node *node,
u32 port,
@@ -1176,6 +1178,8 @@ static inline struct drm_bridge *drmm_of_get_bridge(struct drm_device *drm,
}
#endif
+void devm_drm_put_bridge(struct device *dev, struct drm_bridge *bridge);
+
void drm_bridge_debugfs_params(struct dentry *root);
void drm_bridge_debugfs_encoder_params(struct dentry *root, struct drm_encoder *encoder);
--
2.49.0
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