drm/vc4: tests: Remove vc4_dummy_plane structure

The vc4_dummy_plane structure was introduced as a mean to add
mock-specific fields.

However, we never really used it and it's still strictly equivalent to
vc4_plane (which is in the same situation vs drm_plane), so we can
simply remove the vc4_dummy_plane structure and make the mock code
cleaner.

Reviewed-by: Maíra Canal <mcanal@igalia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240527-kms-hdmi-connector-state-v15-26-c5af16c3aae2@kernel.org
Signed-off-by: Maxime Ripard <mripard@kernel.org>

drivers/gpu/drm/vc4/tests/vc4_mock.c

@@ -109,16 +109,14 @@ static const struct vc4_mock_desc vc5_mock =
 static int __build_one_pipe(struct kunit *test, struct drm_device *drm,
 			    const struct vc4_mock_pipe_desc *pipe)
 {
-	struct vc4_dummy_plane *dummy_plane;
 	struct drm_plane *plane;
 	struct vc4_dummy_crtc *dummy_crtc;
 	struct drm_crtc *crtc;
 	unsigned int i;
 
-	dummy_plane = vc4_dummy_plane(test, drm, DRM_PLANE_TYPE_PRIMARY);
-	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, dummy_plane);
+	plane = vc4_dummy_plane(test, drm, DRM_PLANE_TYPE_PRIMARY);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, plane);
 
-	plane = &dummy_plane->plane.base;
 	dummy_crtc = vc4_mock_pv(test, drm, plane, pipe->data);
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, dummy_crtc);
 

drivers/gpu/drm/vc4/tests/vc4_mock.h

@@ -21,13 +21,8 @@ struct drm_crtc *vc4_find_crtc_for_encoder(struct kunit *test,
 	return NULL;
 }
 
-struct vc4_dummy_plane {
-	struct vc4_plane plane;
-};
-
-struct vc4_dummy_plane *vc4_dummy_plane(struct kunit *test,
-					struct drm_device *drm,
-					enum drm_plane_type type);
+struct drm_plane *vc4_dummy_plane(struct kunit *test, struct drm_device *drm,
+				  enum drm_plane_type type);
 
 struct vc4_dummy_crtc {
 	struct vc4_crtc crtc;

drivers/gpu/drm/vc4/tests/vc4_mock_plane.c

@@ -22,26 +22,22 @@ static const uint32_t vc4_dummy_plane_formats[] = {
 	DRM_FORMAT_XRGB8888,
 };
 
-struct vc4_dummy_plane *vc4_dummy_plane(struct kunit *test,
-					struct drm_device *drm,
-					enum drm_plane_type type)
+struct drm_plane *vc4_dummy_plane(struct kunit *test, struct drm_device *drm,
+				  enum drm_plane_type type)
 {
-	struct vc4_dummy_plane *dummy_plane;
 	struct drm_plane *plane;
 
-	dummy_plane = drmm_universal_plane_alloc(drm,
-						 struct vc4_dummy_plane, plane.base,
+	plane = __drmm_universal_plane_alloc(drm, sizeof(struct drm_plane), 0,
 						 0,
 						 &vc4_dummy_plane_funcs,
 						 vc4_dummy_plane_formats,
 						 ARRAY_SIZE(vc4_dummy_plane_formats),
 						 NULL,
 						 DRM_PLANE_TYPE_PRIMARY,
 						 NULL);
-	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, dummy_plane);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, plane);
 
-	plane = &dummy_plane->plane.base;
 	drm_plane_helper_add(plane, &vc4_dummy_plane_helper_funcs);
 
-	return dummy_plane;
+	return plane;
 }