linux-kernel - [PATCH 28/34] drm/sti: dvo: convert to devm_drm_bridge

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Message-Id: <20250407-drm-bridge-convert-to-alloc-api-v1-28-42113ff8d9c0@bootlin.com>
Date: Mon, 07 Apr 2025 16:23:43 +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: 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, 
 Luca Ceresoli <luca.ceresoli@...tlin.com>, 
 Alain Volmat <alain.volmat@...s.st.com>, 
 Raphael Gallais-Pou <rgallaispou@...il.com>
Subject: [PATCH 28/34] drm/sti: dvo: convert to devm_drm_bridge_alloc() API

This is the new API for allocating DRM bridges.

This driver allocates the DRM bridge separately from the main driver
private struct, which prevents using the new devm_drm_bridge_alloc()
API. Simplify the code by replacing the struct drm_bridge opinter with an
embedded struct drm_bridge inside the provate struct, to make use of the
new API with the same code flow.

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

---

Cc: Alain Volmat <alain.volmat@...s.st.com>
Cc: Raphael Gallais-Pou <rgallaispou@...il.com>
---
 drivers/gpu/drm/sti/sti_dvo.c | 29 +++++++++++------------------
 1 file changed, 11 insertions(+), 18 deletions(-)

diff --git a/drivers/gpu/drm/sti/sti_dvo.c b/drivers/gpu/drm/sti/sti_dvo.c
index 74a1eef4674eeabc445b53b380e325f785242024..7484d3c3f4ed5fac7eab408e30cbe2f6b87f27e5 100644
--- a/drivers/gpu/drm/sti/sti_dvo.c
+++ b/drivers/gpu/drm/sti/sti_dvo.c
@@ -97,7 +97,7 @@ struct sti_dvo {
 	struct dvo_config *config;
 	bool enabled;
 	struct drm_encoder *encoder;
-	struct drm_bridge *bridge;
+	struct drm_bridge bridge;
 };
 
 struct sti_dvo_connector {
@@ -439,7 +439,6 @@ static int sti_dvo_bind(struct device *dev, struct device *master, void *data)
 	struct drm_encoder *encoder;
 	struct sti_dvo_connector *connector;
 	struct drm_connector *drm_connector;
-	struct drm_bridge *bridge;
 	int err;
 
 	/* Set the drm device handle */
@@ -455,20 +454,14 @@ static int sti_dvo_bind(struct device *dev, struct device *master, void *data)
 
 	connector->dvo = dvo;
 
-	bridge = devm_kzalloc(dev, sizeof(*bridge), GFP_KERNEL);
-	if (!bridge)
-		return -ENOMEM;
-
-	bridge->driver_private = dvo;
-	bridge->funcs = &sti_dvo_bridge_funcs;
-	bridge->of_node = dvo->dev.of_node;
-	drm_bridge_add(bridge);
+	dvo->bridge.driver_private = dvo;
+	dvo->bridge.of_node = dvo->dev.of_node;
+	drm_bridge_add(&dvo->bridge);
 
-	err = drm_bridge_attach(encoder, bridge, NULL, 0);
+	err = drm_bridge_attach(encoder, &dvo->bridge, NULL, 0);
 	if (err)
 		return err;
 
-	dvo->bridge = bridge;
 	connector->encoder = encoder;
 	dvo->encoder = encoder;
 
@@ -490,7 +483,7 @@ static int sti_dvo_bind(struct device *dev, struct device *master, void *data)
 	return 0;
 
 err_sysfs:
-	drm_bridge_remove(bridge);
+	drm_bridge_remove(&dvo->bridge);
 	return -EINVAL;
 }
 
@@ -499,7 +492,7 @@ static void sti_dvo_unbind(struct device *dev,
 {
 	struct sti_dvo *dvo = dev_get_drvdata(dev);
 
-	drm_bridge_remove(dvo->bridge);
+	drm_bridge_remove(&dvo->bridge);
 }
 
 static const struct component_ops sti_dvo_ops = {
@@ -515,10 +508,10 @@ static int sti_dvo_probe(struct platform_device *pdev)
 
 	DRM_INFO("%s\n", __func__);
 
-	dvo = devm_kzalloc(dev, sizeof(*dvo), GFP_KERNEL);
-	if (!dvo) {
-		DRM_ERROR("Failed to allocate memory for DVO\n");
-		return -ENOMEM;
+	dvo = devm_drm_bridge_alloc(dev, struct sti_dvo, bridge, &sti_dvo_bridge_funcs);
+	if (IS_ERR(dvo)) {
+		DRM_ERROR("Failed to allocate DVO\n");
+		return PTR_ERR(dvo);
 	}
 
 	dvo->dev = pdev->dev;

-- 
2.49.0