drm/vc4: drv: Call component_unbind_all()

While we were using the component framework to deal with all the DRM
subdevices, we were not calling component_unbind_all().

This leads to none of the subdevices freeing up their resources as part of
their unbind() or device managed hooks.

Fixes: c8b75bca ("drm/vc4: Add KMS support for Raspberry Pi.")
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20220711173939.1132294-13-maxime@cerno.tech

drivers/gpu/drm/vc4/vc4_drv.c

@@ -267,6 +267,13 @@ static void vc4_match_add_drivers(struct device *dev,
 	}
 }
 
+static void vc4_component_unbind_all(void *ptr)
+{
+	struct vc4_dev *vc4 = ptr;
+
+	component_unbind_all(vc4->dev, &vc4->base);
+}
+
 static const struct of_device_id vc4_dma_range_matches[] = {
 	{ .compatible = "brcm,bcm2711-hvs" },
 	{ .compatible = "brcm,bcm2835-hvs" },
@@ -310,6 +317,7 @@ static int vc4_drm_bind(struct device *dev)
 	if (IS_ERR(vc4))
 		return PTR_ERR(vc4);
 	vc4->is_vc5 = is_vc5;
+	vc4->dev = dev;
 
 	drm = &vc4->base;
 	platform_set_drvdata(pdev, drm);
@@ -360,6 +368,10 @@ static int vc4_drm_bind(struct device *dev)
 	if (ret)
 		return ret;
 
+	ret = devm_add_action_or_reset(dev, vc4_component_unbind_all, vc4);
+	if (ret)
+		return ret;
+
 	ret = vc4_plane_create_additional_planes(drm);
 	if (ret)
 		goto unbind_all;
@@ -380,8 +392,6 @@ static int vc4_drm_bind(struct device *dev)
 	return 0;
 
 unbind_all:
-	component_unbind_all(dev, drm);
-
 	return ret;
 }
 

drivers/gpu/drm/vc4/vc4_drv.h

@@ -76,6 +76,7 @@ struct vc4_perfmon {
 
 struct vc4_dev {
 	struct drm_device base;
+	struct device *dev;
 
 	bool is_vc5;