drm/amd/display: Reformat dm_determine_update_type_for_commit

[Why]
The indenting for this function is a few levels too deep and can be
simplified a fair bit. This patch is in preparation for functional
changes that fix update type determination to occur less frequently
and more accurately.

[How]
Place checks early and exit/continue when possible. This isn't
a functional change.
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Reviewed-by: David Francis <David.Francis@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

@@ -5791,7 +5791,14 @@ dm_determine_update_type_for_commit(struct dc *dc,
 		old_dm_crtc_state = to_dm_crtc_state(old_crtc_state);
 		num_plane = 0;
 
-		if (new_dm_crtc_state->stream) {
+		if (!new_dm_crtc_state->stream) {
+			if (!new_dm_crtc_state->stream && old_dm_crtc_state->stream) {
+				update_type = UPDATE_TYPE_FULL;
+				goto cleanup;
+			}
+
+			continue;
+		}
 
 		for_each_oldnew_plane_in_state(state, plane, old_plane_state, new_plane_state, j) {
 			new_plane_crtc = new_plane_state->crtc;
@@ -5805,7 +5812,9 @@ dm_determine_update_type_for_commit(struct dc *dc,
 			if (!state->allow_modeset)
 				continue;
 
-				if (crtc == new_plane_crtc) {
+			if (crtc != new_plane_crtc)
+				continue;
+
 			updates[num_plane].surface = &surface[num_plane];
 
 			if (new_crtc_state->mode_changed) {
@@ -5834,9 +5843,10 @@ dm_determine_update_type_for_commit(struct dc *dc,
 
 			num_plane++;
 		}
-			}
 
-			if (num_plane > 0) {
+		if (num_plane == 0)
+			continue;
+
 		ret = dm_atomic_get_state(state, &dm_state);
 		if (ret)
 			goto cleanup;
@@ -5859,12 +5869,6 @@ dm_determine_update_type_for_commit(struct dc *dc,
 		}
 	}
 
-		} else if (!new_dm_crtc_state->stream && old_dm_crtc_state->stream) {
-			update_type = UPDATE_TYPE_FULL;
-			goto cleanup;
-		}
-	}
-
 cleanup:
 	kfree(updates);
 	kfree(surface);