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Subject: [PATCH v4 1/3] drm/atomic: Allow userspace to use explicit sync with atomic async flips
Date: Thu,  8 Feb 2024 18:05:40 -0300
Message-ID: <20240208210542.550626-2-andrealmeid@igalia.com>
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Allow userspace to use explicit synchronization with atomic async flips.
That means that the flip will wait for some hardware fence, and then
will flip as soon as possible (async) in regard of the vblank.

Signed-off-by: André Almeida <andrealmeid@igalia.com>
---
v4: no changes

 drivers/gpu/drm/drm_atomic_uapi.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_atomic_uapi.c b/drivers/gpu/drm/drm_atomic_uapi.c
index 29d4940188d4..1eecfb9e240d 100644
--- a/drivers/gpu/drm/drm_atomic_uapi.c
+++ b/drivers/gpu/drm/drm_atomic_uapi.c
@@ -1066,7 +1066,9 @@ int drm_atomic_set_property(struct drm_atomic_state *state,
 			break;
 		}
 
-		if (async_flip && prop != config->prop_fb_id) {
+		if (async_flip &&
+		    prop != config->prop_fb_id &&
+		    prop != config->prop_in_fence_fd) {
 			ret = drm_atomic_plane_get_property(plane, plane_state,
 							    prop, &old_val);
 			ret = drm_atomic_check_prop_changes(ret, old_val, prop_value, prop);
-- 
2.43.0