commit d4eebbf5c4cbf7426036af3bf8c27036b1831e59
author Matthew Bouyack <mbouyack@google.com> Mon May 08 13:14:01 2017 -0700
committer Matthew Bouyack <mbouyack@google.com> Mon May 08 13:14:01 2017 -0700
tree 9b7fa9d577d74452561d9c8a021146dc4c8df0d8
parent d863b3af2f5d521f9420ff22f7770843c50d24ae

Disable backpressure propagation in SurfaceFlinger for 8x09 devices.

Because the msm8x09 hardware composer has a total latency of
up to 30ms (from 'handleMessageInvalidate' until the image appears
on the screen) backpressure propagation causes us to run at 30Hz.

This change allows us to run smoothly at 60Hz.

Also note that we should be able to revert this change in the event
that we switch to a native HWC2.0 implementation.

Fixes bug: 37941536

Change-Id: Ie045432e4de72ab59b206ae324e26d54795c9b8a

msm8x09.mk

diff --git a/msm8x09.mk b/msm8x09.mk
index 2f50272..c3d9d98 100644
--- a/msm8x09.mk
+++ b/msm8x09.mk
@@ -16,4 +16,5 @@
 PRODUCT_PROPERTY_OVERRIDES += \
   debug.composition.type=dyn \
   debug.hwc.dynThreshold=4.5 \
-  debug.sf.hwc.canUseABC=1
+  debug.sf.hwc.canUseABC=1 \
+  debug.sf.disable_backpressure=1