drm/armada: Construct a temporary crtc state for plane checks

As armada isn't an atomic driver trying to pass a non-populated
crtc->state to drm_atomic_helper_check_plane_state() will end in tears.
Construct a temporary crtc state a la drm_plane_helper_check_update()
and pass that instead. For now we just really need crtc_state->enable
to be there.

Cc: Dave Airlie <airlied@redhat.com>
Cc: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180123170857.13818-3-ville.syrjala@linux.intel.com
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/armada/armada_crtc.c

@@ -1200,13 +1200,17 @@ static int armada_drm_primary_update(struct drm_plane *plane,
 		.crtc_h = crtc_h,
 		.rotation = DRM_MODE_ROTATE_0,
 	};
+	struct drm_crtc_state crtc_state = {
+		.crtc = crtc,
+		.enable = crtc->enabled,
+	};
 	const struct drm_rect clip = {
 		.x2 = crtc->mode.hdisplay,
 		.y2 = crtc->mode.vdisplay,
 	};
 	int ret;
 
-	ret = drm_atomic_helper_check_plane_state(&state, crtc->state, &clip, 0,
+	ret = drm_atomic_helper_check_plane_state(&state, &crtc_state, &clip, 0,
 						  INT_MAX, true, false);
 	if (ret)
 		return ret;

drivers/gpu/drm/armada/armada_overlay.c

@@ -205,6 +205,10 @@ armada_ovl_plane_update(struct drm_plane *plane, struct drm_crtc *crtc,
 		.crtc_h = crtc_h,
 		.rotation = DRM_MODE_ROTATE_0,
 	};
+	struct drm_crtc_state crtc_state = {
+		.crtc = crtc,
+		.enable = crtc->enabled,
+	};
 	const struct drm_rect clip = {
 		.x2 = crtc->mode.hdisplay,
 		.y2 = crtc->mode.vdisplay,
@@ -215,7 +219,7 @@ armada_ovl_plane_update(struct drm_plane *plane, struct drm_crtc *crtc,
 				 crtc_x, crtc_y, crtc_w, crtc_h,
 				 src_x, src_y, src_w, src_h);
 
-	ret = drm_atomic_helper_check_plane_state(&state, crtc->state, &clip, 0,
+	ret = drm_atomic_helper_check_plane_state(&state, &crtc_state, &clip, 0,
 						  INT_MAX, true, false);
 	if (ret)
 		return ret;