panfrost: signal syncobj if nothing is going to be flushed

When nothing is going to be flushed, the kernel will get no job that
signals the syncobj.

Signal it by ourselves, otherwise it will never get signaled.

Closes: #3371
Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Cc: mesa-stable
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6190>

diff --git a/src/gallium/drivers/panfrost/pan_job.c b/src/gallium/drivers/panfrost/pan_job.c
index 3295d841602d52e4cf35913d45a15b2c90e46613..d59aa22f0494961e309ccc8ba767f72220700508 100644 (file)
--- a/src/gallium/drivers/panfrost/pan_job.c
+++ b/src/gallium/drivers/panfrost/pan_job.c
@@ -1076,8 +1076,11 @@ panfrost_batch_submit(struct panfrost_batch *batch, uint32_t out_sync)
         int ret;
 
         /* Nothing to do! */
-        if (!batch->scoreboard.first_job && !batch->clear)
+        if (!batch->scoreboard.first_job && !batch->clear) {
+                if (out_sync)
+                        drmSyncobjSignal(dev->fd, &out_sync, 1);
                 goto out;
+       }
 
         panfrost_batch_draw_wallpaper(batch);