From: Maxime Ripard <maxime.ripard@free-electrons.com>
Date: Sun, 17 Dec 2017 17:32:21 +0100
Subject: drm/sun4i: backend: Set a default zpos in our reset hook
Git-commit: 2bebcc4564470b03b0220bdc6836bbead750e875
Patch-mainline: v4.17-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

The plane state zpos value will be set only if there's an existing state
attached to the plane when creating the property.

However, this is not the case during the probe, and we therefore need to
put our default value in our reset hook.

Acked-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Link: https://patchwork.freedesktop.org/patch/msgid/b6a183234f0ad5a9a58c780c9cabbe29cbf40888.1516617243.git-series.maxime.ripard@free-electrons.com

Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/sun4i/sun4i_layer.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/gpu/drm/sun4i/sun4i_layer.c
+++ b/drivers/gpu/drm/sun4i/sun4i_layer.c
@@ -28,6 +28,7 @@ struct sun4i_plane_desc {
 
 static void sun4i_backend_layer_reset(struct drm_plane *plane)
 {
+	struct sun4i_layer *layer = plane_to_sun4i_layer(plane);
 	struct sun4i_layer_state *state;
 
 	if (plane->state) {
@@ -43,6 +44,7 @@ static void sun4i_backend_layer_reset(st
 	if (state) {
 		plane->state = &state->state;
 		plane->state->plane = plane;
+		plane->state->zpos = layer->id;
 	}
 }