linux-kernel - [PATCH v8 8/8] drm/etnaviv: add a dedicated function to create the virtual master

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Message-Id: <20230607105551.568639-9-15330273260@189.cn>
Date:   Wed,  7 Jun 2023 18:55:51 +0800
From:   Sui Jingfeng <15330273260@....cn>
To:     Lucas Stach <l.stach@...gutronix.de>,
        Russell King <linux+etnaviv@...linux.org.uk>,
        Christian Gmeiner <christian.gmeiner@...il.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>, Li Yi <liyi@...ngson.cn>
Cc:     linux-kernel@...r.kernel.org, etnaviv@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org,
        Sui Jingfeng <suijingfeng@...ngson.cn>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Bjorn Helgaas <bhelgaas@...gle.com>
Subject: [PATCH v8 8/8] drm/etnaviv: add a dedicated function to create the virtual master

From: Sui Jingfeng <suijingfeng@...ngson.cn>

After introducing the etnaviv_of_first_available_node() helper, the
creation of the virtual master platform device can also be simplified.
So, switch to etnaviv_create_virtual_master() function.

Cc: Lucas Stach <l.stach@...gutronix.de>
Cc: Christian Gmeiner <christian.gmeiner@...il.com>
Cc: Philipp Zabel <p.zabel@...gutronix.de>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>
Cc: Daniel Vetter <daniel@...ll.ch>
Signed-off-by: Sui Jingfeng <suijingfeng@...ngson.cn>
---
 drivers/gpu/drm/etnaviv/etnaviv_drv.c | 43 ++++++++++++++++-----------
 1 file changed, 26 insertions(+), 17 deletions(-)

diff --git a/drivers/gpu/drm/etnaviv/etnaviv_drv.c b/drivers/gpu/drm/etnaviv/etnaviv_drv.c
index d7e7498826f5..6f2260a76433 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_drv.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_drv.c
@@ -769,10 +769,32 @@ static void etnaviv_destroy_platform_device(struct platform_device **ppdev)
 	*ppdev = NULL;
 }
 
+static int etnaviv_create_virtual_master(void)
+{
+	struct platform_device **master = &etnaviv_platform_device;
+	struct device_node *np;
+
+	/*
+	 * If the DT contains at least one available GPU device, instantiate
+	 * the DRM platform device.
+	 */
+	np = etnaviv_of_first_available_node();
+	if (np) {
+		int ret;
+
+		of_node_put(np);
+
+		ret = etnaviv_create_platform_device("etnaviv", master);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
 static int __init etnaviv_init(void)
 {
 	int ret;
-	struct device_node *np;
 
 	etnaviv_validate_init();
 
@@ -790,22 +812,9 @@ static int __init etnaviv_init(void)
 		goto unregister_platform_driver;
 #endif
 
-	/*
-	 * If the DT contains at least one available GPU device, instantiate
-	 * the DRM platform device.
-	 */
-	for_each_compatible_node(np, NULL, "vivante,gc") {
-		if (!of_device_is_available(np))
-			continue;
-		of_node_put(np);
-
-		ret = etnaviv_create_platform_device("etnaviv",
-						     &etnaviv_platform_device);
-		if (ret)
-			goto unregister_platform_driver;
-
-		break;
-	}
+	ret = etnaviv_create_virtual_master();
+	if (ret)
+		goto unregister_platform_driver;
 
 	return ret;
 
-- 
2.25.1