[Bug 286311] x11-wm/sway: fails to start on amdgpu after ports bb43067a6928

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=286311

--- Comment #14 from Evgenii Khramtsov <2khramtsov@gmail.com> ---
(In reply to Evgenii Khramtsov from comment #13)

Opting out from explicit sync seemed fine for one day (no panics, software
works etc), one can also test (seems to work too):

diff --git a/drivers/gpu/drm/drm_gem_atomic_helper.c
b/drivers/gpu/drm/drm_gem_atomic_helper.c
index 4fb8acd280..f1aa85f5b7 100644
--- a/drivers/gpu/drm/drm_gem_atomic_helper.c
+++ b/drivers/gpu/drm/drm_gem_atomic_helper.c
@@ -20,14 +20,13 @@ drm_gem_plane_helper_prepare_fb(struct drm_plane *dp,
                obj = dps->fb->obj[0];
                if (obj == NULL)
                        return -EINVAL;
-               if (dps->fence) {
-                       printf("%s: explicit fence not handled\n", __func__);
-                       return -EINVAL;
-               }
                r = dma_resv_get_singleton(obj->resv, DMA_RESV_USAGE_WRITE,
&f);
                if (r)
                        return r;
-               dps->fence = f;
+               if (dps->fence)
+                       dma_fence_put(f);
+               else
+                       dps->fence = f;
        }

        return 0;

Obtained from: https://github.com/openbsd/src/commit/4ae46dfd37dc

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