linux-kernel - [PATCH 27/34] drm/vc4: convert to devm_drm_bridge

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Message-Id: <20250407-drm-bridge-convert-to-alloc-api-v1-27-42113ff8d9c0@bootlin.com>
Date: Mon, 07 Apr 2025 16:23:42 +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>, 
 Maíra Canal <mcanal@...lia.com>, 
 Dave Stevenson <dave.stevenson@...pberrypi.com>, 
 Raspberry Pi Kernel Maintenance <kernel-list@...pberrypi.com>
Subject: [PATCH 27/34] drm/vc4: convert to devm_drm_bridge_alloc() API

This is the new API for allocating DRM bridges.

This driver already implements refcounting of the struct vc4_dsi, which
embeds struct drm_bridge. Now this is a duplicate of the refcounting
implemented by the DRM bridge core, so convert the vc4_dsi_get/put() calls
into drm_bridge_get/put() calls and get rid of the driver-specific
refcounting implementation.

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

---

Cc: "Maíra Canal" <mcanal@...lia.com>
Cc: Dave Stevenson <dave.stevenson@...pberrypi.com>
Cc: Raspberry Pi Kernel Maintenance <kernel-list@...pberrypi.com>
---
 drivers/gpu/drm/vc4/vc4_dsi.c | 30 +++---------------------------
 1 file changed, 3 insertions(+), 27 deletions(-)

diff --git a/drivers/gpu/drm/vc4/vc4_dsi.c b/drivers/gpu/drm/vc4/vc4_dsi.c
index efc6f6078b026764c59cfb2a33b28a88b7018c3a..3071fa36fdfa8e3f4485019a64d83ef69fac73b6 100644
--- a/drivers/gpu/drm/vc4/vc4_dsi.c
+++ b/drivers/gpu/drm/vc4/vc4_dsi.c
@@ -552,8 +552,6 @@ struct vc4_dsi {
 	struct vc4_encoder encoder;
 	struct mipi_dsi_host dsi_host;
 
-	struct kref kref;
-
 	struct platform_device *pdev;
 
 	struct drm_bridge *out_bridge;
@@ -1622,29 +1620,11 @@ static void vc4_dsi_dma_chan_release(void *ptr)
 	dsi->reg_dma_chan = NULL;
 }
 
-static void vc4_dsi_release(struct kref *kref)
-{
-	struct vc4_dsi *dsi =
-		container_of(kref, struct vc4_dsi, kref);
-
-	kfree(dsi);
-}
-
-static void vc4_dsi_get(struct vc4_dsi *dsi)
-{
-	kref_get(&dsi->kref);
-}
-
-static void vc4_dsi_put(struct vc4_dsi *dsi)
-{
-	kref_put(&dsi->kref, &vc4_dsi_release);
-}
-
 static void vc4_dsi_release_action(struct drm_device *drm, void *ptr)
 {
 	struct vc4_dsi *dsi = ptr;
 
-	vc4_dsi_put(dsi);
+	drm_bridge_put(&dsi->bridge);
 }
 
 static int vc4_dsi_bind(struct device *dev, struct device *master, void *data)
@@ -1655,7 +1635,7 @@ static int vc4_dsi_bind(struct device *dev, struct device *master, void *data)
 	struct drm_encoder *encoder = &dsi->encoder.base;
 	int ret;
 
-	vc4_dsi_get(dsi);
+	drm_bridge_get(&dsi->bridge);
 
 	ret = drmm_add_action_or_reset(drm, vc4_dsi_release_action, dsi);
 	if (ret)
@@ -1810,15 +1790,12 @@ static int vc4_dsi_dev_probe(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 	struct vc4_dsi *dsi;
 
-	dsi = kzalloc(sizeof(*dsi), GFP_KERNEL);
+	dsi = devm_drm_bridge_alloc(&pdev->dev, struct vc4_dsi, bridge, &vc4_dsi_bridge_funcs);
 	if (!dsi)
 		return -ENOMEM;
 	dev_set_drvdata(dev, dsi);
 
-	kref_init(&dsi->kref);
-
 	dsi->pdev = pdev;
-	dsi->bridge.funcs = &vc4_dsi_bridge_funcs;
 #ifdef CONFIG_OF
 	dsi->bridge.of_node = dev->of_node;
 #endif
@@ -1836,7 +1813,6 @@ static void vc4_dsi_dev_remove(struct platform_device *pdev)
 	struct vc4_dsi *dsi = dev_get_drvdata(dev);
 
 	mipi_dsi_host_unregister(&dsi->dsi_host);
-	vc4_dsi_put(dsi);
 }
 
 struct platform_driver vc4_dsi_driver = {

-- 
2.49.0