Mesa (master): freedreno: avoid unneccessary batch flush

[Rob Clark]

Module: Mesa
Branch: master
Commit: 91730fb0ffc77682cfd5cebbefdad2f8f92f2431
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=91730fb0ffc77682cfd5cebbefdad2f8f92f2431

Author: Rob Clark <robdclark at gmail.com>
Date:   Sun Nov 19 16:45:04 2017 -0500

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 at gmail.com>

---

 src/gallium/drivers/freedreno/freedreno_batch.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/gallium/drivers/freedreno/freedreno_batch.c b/src/gallium/drivers/freedreno/freedreno_batch.c
index eff5e8dc35..9c66dc98bc 100644
--- 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()