[PATCH 3/3] drm/sun4i: Add format_mod_supported function

["José Expósito" <jose.exposito89@gmail.com>]

Implement the missing "drm_plane_funcs.format_mod_supported" function
to avoid exposing an invalid IN_FORMATS blob with modifiers but no
formats.

Signed-off-by: José Expósito <jose.exposito89@gmail.com>
---
 drivers/gpu/drm/sun4i/sun8i_ui_layer.c | 7 +++++++
 drivers/gpu/drm/sun4i/sun8i_vi_layer.c | 7 +++++++
 2 files changed, 14 insertions(+)

diff --git a/drivers/gpu/drm/sun4i/sun8i_ui_layer.c b/drivers/gpu/drm/sun4i/sun8i_ui_layer.c
index 7845c2a53a7f..728563f23cd6 100644
--- a/drivers/gpu/drm/sun4i/sun8i_ui_layer.c
+++ b/drivers/gpu/drm/sun4i/sun8i_ui_layer.c
@@ -331,6 +331,12 @@ static void sun8i_ui_layer_atomic_update(struct drm_plane *plane,
 			      true, zpos, old_zpos);
 }
 
+static bool sun8i_ui_layer_format_mod_supported(struct drm_plane *plane,
+						u32 format, u64 modifier)
+{
+	return (modifier == DRM_FORMAT_MOD_LINEAR);
+}
+
 static const struct drm_plane_helper_funcs sun8i_ui_layer_helper_funcs = {
 	.atomic_check	= sun8i_ui_layer_atomic_check,
 	.atomic_disable	= sun8i_ui_layer_atomic_disable,
@@ -344,6 +350,7 @@ static const struct drm_plane_funcs sun8i_ui_layer_funcs = {
 	.disable_plane		= drm_atomic_helper_disable_plane,
 	.reset			= drm_atomic_helper_plane_reset,
 	.update_plane		= drm_atomic_helper_update_plane,
+	.format_mod_supported	= sun8i_ui_layer_format_mod_supported,
 };
 
 static const u32 sun8i_ui_layer_formats[] = {
diff --git a/drivers/gpu/drm/sun4i/sun8i_vi_layer.c b/drivers/gpu/drm/sun4i/sun8i_vi_layer.c
index bb7c43036dfa..d17813a7cac3 100644
--- a/drivers/gpu/drm/sun4i/sun8i_vi_layer.c
+++ b/drivers/gpu/drm/sun4i/sun8i_vi_layer.c
@@ -435,6 +435,12 @@ static void sun8i_vi_layer_atomic_update(struct drm_plane *plane,
 			      true, zpos, old_zpos);
 }
 
+static bool sun8i_vi_layer_format_mod_supported(struct drm_plane *plane,
+						u32 format, u64 modifier)
+{
+	return (modifier == DRM_FORMAT_MOD_LINEAR);
+}
+
 static const struct drm_plane_helper_funcs sun8i_vi_layer_helper_funcs = {
 	.atomic_check	= sun8i_vi_layer_atomic_check,
 	.atomic_disable	= sun8i_vi_layer_atomic_disable,
@@ -448,6 +454,7 @@ static const struct drm_plane_funcs sun8i_vi_layer_funcs = {
 	.disable_plane		= drm_atomic_helper_disable_plane,
 	.reset			= drm_atomic_helper_plane_reset,
 	.update_plane		= drm_atomic_helper_update_plane,
+	.format_mod_supported	= sun8i_vi_layer_format_mod_supported,
 };
 
 /*
-- 
2.25.1