openwrt/target/linux/bcm27xx/patches-5.15/950-0904-drm-vc4-drv-Skip-BO-Backend-Initialization-on-BCM271.patch

From 37f9fb928b7f32f4ee16cbd494aa15f146b20a65 Mon Sep 17 00:00:00 2001
From: Maxime Ripard <maxime@cerno.tech>
Date: Thu, 21 Apr 2022 17:29:02 +0200
Subject: [PATCH] drm/vc4: drv: Skip BO Backend Initialization on
 BCM2711

On the BCM2711, we currently call the vc4_bo_cache_init() and
vc4_gem_init() functions. These functions initialize the BO and GEM
backends.

However, this code was initially created to accomodate the requirements
of the GPU on the older SoCs, while the BCM2711 has a separate driver
for it. So let's just skip these calls when we're on a newer hardware.

Signed-off-by: Maxime Ripard <maxime@cerno.tech>
---
 drivers/gpu/drm/vc4/vc4_drv.c | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

--- a/drivers/gpu/drm/vc4/vc4_drv.c
+++ b/drivers/gpu/drm/vc4/vc4_drv.c
@@ -324,19 +324,23 @@ static int vc4_drm_bind(struct device *d
 	platform_set_drvdata(pdev, drm);
 	INIT_LIST_HEAD(&vc4->debugfs_list);
 
-	mutex_init(&vc4->bin_bo_lock);
+	if (!is_vc5) {
+		mutex_init(&vc4->bin_bo_lock);
 
-	ret = vc4_bo_cache_init(drm);
-	if (ret)
-		return ret;
+		ret = vc4_bo_cache_init(drm);
+		if (ret)
+			return ret;
+	}
 
 	ret = drmm_mode_config_init(drm);
 	if (ret)
 		return ret;
 
-	ret = vc4_gem_init(drm);
-	if (ret)
-		return ret;
+	if (!is_vc5) {
+		ret = vc4_gem_init(drm);
+		if (ret)
+			return ret;
+	}
 
 	node = of_find_compatible_node(NULL, NULL, "raspberrypi,bcm2835-firmware");
 	if (node) {