[PATCH drm-misc-next v4 3/4] drm: verisilicon: call atomic helper's plane state check even if no CRTC

[Icenowy Zheng <zhengxingda@iscas.ac.cn>]

The `drm_atomic_helper_check_plane_state()` helper function needs to be
called even if the plane is bound to no CRTCs.

Remove the early return in the primary plane's atomic_check, and use
NULL for crtc_state in this situation.

Fixes: dbf21777caa8 ("drm: verisilicon: add a driver for Verisilicon display controllers")
Signed-off-by: Icenowy Zheng <zhengxingda@iscas.ac.cn>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
---
Changes in v4:
- Add Fixed tag.
- Add Thomas's R-b.

New patch in v3.

 drivers/gpu/drm/verisilicon/vs_primary_plane.c | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/verisilicon/vs_primary_plane.c b/drivers/gpu/drm/verisilicon/vs_primary_plane.c
index bad0bc5e3242d..421d6f9dc547b 100644
--- a/drivers/gpu/drm/verisilicon/vs_primary_plane.c
+++ b/drivers/gpu/drm/verisilicon/vs_primary_plane.c
@@ -26,14 +26,10 @@ static int vs_primary_plane_atomic_check(struct drm_plane *plane,
 	struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(state,
 										 plane);
 	struct drm_crtc *crtc = new_plane_state->crtc;
-	struct drm_crtc_state *crtc_state;
+	struct drm_crtc_state *crtc_state = NULL;
 
-	if (!crtc)
-		return 0;
-
-	crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
-	if (WARN_ON(!crtc_state))
-		return -EINVAL;
+	if (crtc)
+		crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
 
 	return drm_atomic_helper_check_plane_state(new_plane_state,
 						   crtc_state,
-- 
2.52.0