drm/selftest: Refactor test-drm_plane_helper

The idea is to split test implementations in different compilation
units, but have one single place where we define the list of tests,
in this case(drm_modeset_selftests.h).
Signed-off-by: Alexandru Gheorghe <alexandru-cosmin.gheorghe@arm.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20181019105752.17741-9-alexandru-cosmin.gheorghe@arm.com

drivers/gpu/drm/selftests/test-drm_modeset_common.c

@@ -7,9 +7,18 @@
 
 #include "test-drm_modeset_common.h"
 
+#define TESTS "drm_modeset_selftests.h"
+#include "drm_selftest.h"
+
+#include "drm_selftest.c"
+
 static int __init test_drm_modeset_init(void)
 {
-	return test_drm_plane_helper();
+	int err;
+
+	err = run_selftests(selftests, ARRAY_SIZE(selftests), NULL);
+
+	return err > 0 ? 0 : err;
 }
 
 static void __exit test_drm_modeset_exit(void)

drivers/gpu/drm/selftests/test-drm_modeset_common.h

@@ -13,6 +13,6 @@
 
 #define FAIL_ON(x) FAIL((x), "%s", "FAIL_ON(" __stringify(x) ")\n")
 
-int test_drm_plane_helper(void);
+int igt_check_plane_state(void *ignored);
 
 #endif

drivers/gpu/drm/selftests/test-drm_plane_helper.c

@@ -11,9 +11,6 @@
 
 #include "test-drm_modeset_common.h"
 
-#define TESTS "drm_plane_helper_selftests.h"
-#include "drm_selftest.h"
-
 static void set_src(struct drm_plane_state *plane_state,
 		    unsigned src_x, unsigned src_y,
 		    unsigned src_w, unsigned src_h)
@@ -76,7 +73,7 @@ static bool check_crtc_eq(struct drm_plane_state *plane_state,
 	return true;
 }
 
-static int igt_check_plane_state(void *ignored)
+int igt_check_plane_state(void *ignored)
 {
 	int ret;
 
@@ -220,17 +217,3 @@ static int igt_check_plane_state(void *ignored)
 
 	return 0;
 }
-
-#include "drm_selftest.c"
-
-/**
- * test_drm_plane_helper - Run drm plane helper selftests.
- */
-int test_drm_plane_helper(void)
-{
-	int err;
-
-	err = run_selftests(selftests, ARRAY_SIZE(selftests), NULL);
-
-	return err > 0 ? 0 : err;
-}