drm/meson: Add implicit fencing support for primary and overlay planes

Suggested by Qiang Yu <yuq825@gmail.com> to fix tearing artefacts in the
Kodi GUI.
Suggested-by: Qiang Yu <yuq825@gmail.com>
Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>
Acked-by: Neil Armstrong <narmstrong@baylibre.com>
[narmstrong: added Suggested-by tag]
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1542621759-26413-1-git-send-email-koen@dominion.thruhere.net

drivers/gpu/drm/meson/meson_overlay.c

@@ -16,6 +16,7 @@
 #include <drm/drm_plane_helper.h>
 #include <drm/drm_gem_cma_helper.h>
 #include <drm/drm_fb_cma_helper.h>
+#include <drm/drm_gem_framebuffer_helper.h>
 #include <drm/drm_rect.h>
 
 #include "meson_overlay.h"
@@ -532,6 +533,7 @@ static const struct drm_plane_helper_funcs meson_overlay_helper_funcs = {
 	.atomic_check	= meson_overlay_atomic_check,
 	.atomic_disable	= meson_overlay_atomic_disable,
 	.atomic_update	= meson_overlay_atomic_update,
+	.prepare_fb	= drm_gem_fb_prepare_fb,
 };
 
 static const struct drm_plane_funcs meson_overlay_funcs = {

drivers/gpu/drm/meson/meson_plane.c

@@ -32,6 +32,7 @@
 #include <drm/drm_plane_helper.h>
 #include <drm/drm_gem_cma_helper.h>
 #include <drm/drm_fb_cma_helper.h>
+#include <drm/drm_gem_framebuffer_helper.h>
 #include <drm/drm_rect.h>
 
 #include "meson_plane.h"
@@ -322,6 +323,7 @@ static const struct drm_plane_helper_funcs meson_plane_helper_funcs = {
 	.atomic_check	= meson_plane_atomic_check,
 	.atomic_disable	= meson_plane_atomic_disable,
 	.atomic_update	= meson_plane_atomic_update,
+	.prepare_fb	= drm_gem_fb_prepare_fb,
 };
 
 static const struct drm_plane_funcs meson_plane_funcs = {