[PATCH 3/3] drm/ast: Enable primary plane with CRTC

[Thomas Zimmermann <tzimmermann@xxxxxxx>]

As the CRTC requires a primary plane for display, ensure that the
primary plane is enabled with the CRTC.

Use drm_atomic_helper_check_crtc_state(). Add all affected planes
to the atomic state so that their state will be checked as well.

Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
---
 drivers/gpu/drm/ast/ast_mode.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/ast/ast_mode.c b/drivers/gpu/drm/ast/ast_mode.c
index db2010a55674..e992e07a26f9 100644
--- a/drivers/gpu/drm/ast/ast_mode.c
+++ b/drivers/gpu/drm/ast/ast_mode.c
@@ -1094,15 +1094,19 @@ ast_crtc_helper_mode_valid(struct drm_crtc *crtc, const struct drm_display_mode
 static int ast_crtc_helper_atomic_check(struct drm_crtc *crtc,
 					struct drm_atomic_state *state)
 {
-	struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state,
-									  crtc);
+	struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
 	struct drm_device *dev = crtc->dev;
 	struct ast_crtc_state *ast_state;
 	const struct drm_format_info *format;
 	bool succ;
+	int ret;
+
+	ret = drm_atomic_helper_check_crtc_state(crtc_state, false);
+	if (ret)
+		return ret;
 
 	if (!crtc_state->enable)
-		return 0; /* no mode checks if CRTC is being disabled */
+		goto out;
 
 	ast_state = to_ast_crtc_state(crtc_state);
 
@@ -1116,7 +1120,8 @@ static int ast_crtc_helper_atomic_check(struct drm_crtc *crtc,
 	if (!succ)
 		return -EINVAL;
 
-	return 0;
+out:
+	return drm_atomic_add_affected_planes(state, crtc);
 }
 
 static void ast_crtc_helper_atomic_begin(struct drm_crtc *crtc, struct drm_atomic_state *state)
-- 
2.36.1