From: Maxime Ripard <maxime.ripard@free-electrons.com>
Date: Sun, 17 Dec 2017 18:06:05 +0100
Subject: drm/sun4i: framebuffer: Add a custom atomic_check
Git-commit: b8f1230dd3bf99a77b74ea87a57d45422a5981cf
Patch-mainline: v4.17-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

In order to support normalized zpos, we need to call
drm_atomic_normalize_zpos in our driver's drm_mode_config_funcs'
atomic_check.

Let's duplicate the definition of drm_atomic_helper_check for now.

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/67cb4ca9889e6bf29314db37127ff15eed279c53.1516617243.git-series.maxime.ripard@free-electrons.com

Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/sun4i/sun4i_framebuffer.c |   14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/sun4i/sun4i_framebuffer.c
+++ b/drivers/gpu/drm/sun4i/sun4i_framebuffer.c
@@ -20,9 +20,21 @@
 #include "sun4i_drv.h"
 #include "sun4i_framebuffer.h"
 
+static int sun4i_de_atomic_check(struct drm_device *dev,
+				 struct drm_atomic_state *state)
+{
+	int ret;
+
+	ret = drm_atomic_helper_check_modeset(dev, state);
+	if (ret)
+		return ret;
+
+	return drm_atomic_helper_check_planes(dev, state);
+}
+
 static const struct drm_mode_config_funcs sun4i_de_mode_config_funcs = {
 	.output_poll_changed	= drm_fb_helper_output_poll_changed,
-	.atomic_check		= drm_atomic_helper_check,
+	.atomic_check		= sun4i_de_atomic_check,
 	.atomic_commit		= drm_atomic_helper_commit,
 	.fb_create		= drm_gem_fb_create,
 };