commit dc28b3706b61ba1326658d96400fe55faf3dcb3e
author Alec Mouri <alecmouri@google.com> Thu Apr 18 21:17:13 2019 -0700
committer Alec Mouri <alecmouri@google.com> Wed May 15 11:20:47 2019 -0700
tree 0f4a1937d847d3b0a0e5745df28c5f93c50aff22
parent f888c9327f472ed02c4a5ae240ec5f6fa39fff54

Support repurposing idle timer to work with kernel timer.

Idle timer would instead enable/disable hw vsyncs in accordance with
inactivity.

Bug: 130684082
Test: systrace
Change-Id: I289600fc41b7ded863c9486cf6c2ab6155b06550

services/surfaceflinger/Scheduler/IdleTimer.cpp

diff --git a/services/surfaceflinger/Scheduler/IdleTimer.cpp b/services/surfaceflinger/Scheduler/IdleTimer.cpp
index b28b1aa..37fdfc7 100644
--- a/services/surfaceflinger/Scheduler/IdleTimer.cpp
+++ b/services/surfaceflinger/Scheduler/IdleTimer.cpp
@@ -84,8 +84,11 @@
                 constexpr auto zero = std::chrono::steady_clock::duration::zero();
                 auto waitTime = triggerTime - std::chrono::steady_clock::now();
                 if (waitTime > zero) mCondition.wait_for(mMutex, waitTime);
-                if (mState == TimerState::WAITING &&
-                    (triggerTime - std::chrono::steady_clock::now()) <= zero) {
+                if (mState == TimerState::RESET) {
+                    triggerTime = std::chrono::steady_clock::now() + mInterval;
+                    mState = TimerState::WAITING;
+                } else if (mState == TimerState::WAITING &&
+                           (triggerTime - std::chrono::steady_clock::now()) <= zero) {
                     triggerTimeout = true;
                     mState = TimerState::IDLE;
                 }