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.

Reviewed-by: Melissa Wen <mwen@igalia.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20220610115149.964394-9-maxime@cerno.tech

drivers/gpu/drm/vc4/vc4_drv.c

@@ -285,19 +285,23 @@ static int vc4_drm_bind(struct device *dev)
 	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) {