drm/sun4i: framebuffer: Add a custom atomic_check

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

1 files changed, 13 insertions, 1 deletions

diff --git a/drivers/gpu/drm/sun4i/sun4i_framebuffer.c b/drivers/gpu/drm/sun4i/sun4i_framebuffer.c
index cf52fa7f495e..973ee1fc95c9 100644
--- 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,
 };