SF: add a new behaviour for idle timer on VRR

When idle timer times out on VRR, change the refresh rate
indicator to show "- -". The render rate doesn't cange as a result
of idleness.

Bug: 333443503
Test: manual
Flag: EXEMPT bugfix
Change-Id: Ie4f51a2a9da1a5e229b3504881117b12f1fd1b6a

1 files changed, 6 insertions, 0 deletions

diff --git a/services/surfaceflinger/DisplayDevice.cpp b/services/surfaceflinger/DisplayDevice.cpp
index 8288b99864..75b07a8854 100644
--- a/services/surfaceflinger/DisplayDevice.cpp
+++ b/services/surfaceflinger/DisplayDevice.cpp
@@ -468,6 +468,12 @@ bool DisplayDevice::onKernelTimerChanged(std::optional<DisplayModeId> desiredMod
     return false;
 }
 
+void DisplayDevice::onVrrIdle(bool idle) {
+    if (mRefreshRateOverlay) {
+        mRefreshRateOverlay->onVrrIdle(idle);
+    }
+}
+
 void DisplayDevice::animateOverlay() {
     if (mRefreshRateOverlay) {
         mRefreshRateOverlay->animate();