freedreno: avoid unneccessary batch flush

In some cases we can end up trying to add a write dependency on ourself,
which shouldn't trigger a flush.

Avoids an extra couple flushes per from in stk.

Signed-off-by: Rob Clark <robdclark@gmail.com>

diff --git a/src/gallium/drivers/freedreno/freedreno_batch.c b/src/gallium/drivers/freedreno/freedreno_batch.c
index eff5e8d..9c66dc9 100644 (file)
--- a/src/gallium/drivers/freedreno/freedreno_batch.c
+++ b/src/gallium/drivers/freedreno/freedreno_batch.c
@@ -393,6 +393,8 @@ fd_batch_resource_used(struct fd_batch *batch, struct fd_resource *rsc, bool wri
                        struct fd_batch *dep;
                        foreach_batch(dep, cache, rsc->batch_mask) {
                                struct fd_batch *b = NULL;
+                               if (dep == batch)
+                                       continue;
                                /* note that batch_add_dep could flush and unref dep, so
                                 * we need to hold a reference to keep it live for the
                                 * fd_bc_invalidate_batch()