diff --git a/drivers/gpu/drm/exynos/exynos_drm_fb.c b/drivers/gpu/drm/exynos/exynos_drm_fb.c
index 849925ca0cdd6471efc7b3dac003936d5609d289..5087f60985f5562131653a316325b057fbc2fd8a 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_fb.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_fb.c
@@ -121,15 +121,6 @@ static struct drm_framebuffer_funcs exynos_drm_fb_funcs = {
 	.dirty		= exynos_drm_fb_dirty,
 };
 
-unsigned int exynos_drm_fb_get_buf_cnt(struct drm_framebuffer *fb)
-{
-	struct exynos_drm_fb *exynos_fb;
-
-	exynos_fb = to_exynos_fb(fb);
-
-	return exynos_fb->buf_cnt;
-}
-
 struct drm_framebuffer *
 exynos_drm_framebuffer_init(struct drm_device *dev,
 			    struct drm_mode_fb_cmd2 *mode_cmd,
diff --git a/drivers/gpu/drm/exynos/exynos_drm_fb.h b/drivers/gpu/drm/exynos/exynos_drm_fb.h
index 8900f6baf315313cec51a5d353343b5e88e23fca..85e4445b920e30673bb7f3ae38591c5a29a5f902 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_fb.h
+++ b/drivers/gpu/drm/exynos/exynos_drm_fb.h
@@ -28,7 +28,4 @@ struct exynos_drm_gem_obj *exynos_drm_fb_gem_obj(struct drm_framebuffer *fb,
 
 void exynos_drm_mode_config_init(struct drm_device *dev);
 
-/* get a buffer count to drm framebuffer. */
-unsigned int exynos_drm_fb_get_buf_cnt(struct drm_framebuffer *fb);
-
 #endif
diff --git a/drivers/gpu/drm/exynos/exynos_drm_plane.c b/drivers/gpu/drm/exynos/exynos_drm_plane.c
index 865d6eb0c8458e4f5e7f6df80ec5e1d495d9db69..7148224414672c37ef96a562b5f0d7f91931411a 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_plane.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_plane.c
@@ -126,7 +126,7 @@ static int exynos_plane_atomic_check(struct drm_plane *plane,
 	if (!state->fb)
 		return 0;
 
-	nr = exynos_drm_fb_get_buf_cnt(state->fb);
+	nr = drm_format_num_planes(state->fb->pixel_format);
 	for (i = 0; i < nr; i++) {
 		struct exynos_drm_gem_obj *obj =
 					exynos_drm_fb_gem_obj(state->fb, i);