[PATCH] drm: warn if cursor plane is set with legacy funcs

[Simon Ser]

A driver must not set drm_crtc.cursor and any of the legacy funcs at the
same time, otherwise it's not clear which one DRM core should use for
legacy cursor updates.

Signed-off-by: Simon Ser <contact at emersion.fr>
Cc: Daniel Vetter <daniel at ffwll.ch>
---
 drivers/gpu/drm/drm_mode_config.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/gpu/drm/drm_mode_config.c b/drivers/gpu/drm/drm_mode_config.c
index 9611f21bca00..92e56baf04ad 100644
--- a/drivers/gpu/drm/drm_mode_config.c
+++ b/drivers/gpu/drm/drm_mode_config.c
@@ -645,6 +645,16 @@ void drm_mode_config_validate(struct drm_device *dev)
 		WARN(!crtc->primary, "Missing primary plane on [CRTC:%d:%s]\n",
 		     crtc->base.id, crtc->name);
 
+		WARN(crtc->cursor && crtc->funcs->cursor_set,
+		     "[CRTC:%d:%s] must not have both a cursor plane and a cursor_set func",
+		     crtc->base.id, crtc->name);
+		WARN(crtc->cursor && crtc->funcs->cursor_set2,
+		     "[CRTC:%d:%s] must not have both a cursor plane and a cursor_set2 func",
+		     crtc->base.id, crtc->name);
+		WARN(crtc->cursor && crtc->funcs->cursor_move,
+		     "[CRTC:%d:%s] must not have both a cursor plane and a cursor_move func",
+		     crtc->base.id, crtc->name);
+
 		if (crtc->primary) {
 			WARN(!(crtc->primary->possible_crtcs & drm_crtc_mask(crtc)),
 			     "Bogus primary plane possible_crtcs: [PLANE:%d:%s] must be compatible with [CRTC:%d:%s]\n",
-- 
2.29.2