compositor-drm: Calculate atomic-commit flags earlier

Shift up our calculation of the flags we use for atomic commits. We will
later use this to differentiate between test-only and full commits when
printing debug information inside drm_output_state_apply_atomic.

Signed-off-by: Daniel Stone <daniels@collabora.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>

libweston/compositor-drm.c

@@ -2497,12 +2497,24 @@ drm_pending_state_apply_atomic(struct drm_pending_state *pending_state,
 	struct drm_output_state *output_state, *tmp;
 	struct drm_plane *plane;
 	drmModeAtomicReq *req = drmModeAtomicAlloc();
-	uint32_t flags = 0;
+	uint32_t flags;
 	int ret = 0;
 
 	if (!req)
 		return -1;
 
+	switch (mode) {
+	case DRM_STATE_APPLY_SYNC:
+		flags = 0;
+		break;
+	case DRM_STATE_APPLY_ASYNC:
+		flags = DRM_MODE_PAGE_FLIP_EVENT | DRM_MODE_ATOMIC_NONBLOCK;
+		break;
+	case DRM_STATE_TEST_ONLY:
+		flags = DRM_MODE_ATOMIC_TEST_ONLY;
+		break;
+	}
+
 	if (b->state_invalid) {
 		struct weston_head *head_base;
 		struct drm_head *head;
@@ -2595,17 +2607,6 @@ drm_pending_state_apply_atomic(struct drm_pending_state *pending_state,
 		goto out;
 	}
 
-	switch (mode) {
-	case DRM_STATE_APPLY_SYNC:
-		break;
-	case DRM_STATE_APPLY_ASYNC:
-		flags |= DRM_MODE_PAGE_FLIP_EVENT | DRM_MODE_ATOMIC_NONBLOCK;
-		break;
-	case DRM_STATE_TEST_ONLY:
-		flags |= DRM_MODE_ATOMIC_TEST_ONLY;
-		break;
-	}
-
 	ret = drmModeAtomicCommit(b->drm.fd, req, flags, b);
 
 	/* Test commits do not take ownership of the state; return