SF: Update vsync timeline validUntil to be exact vsync time.
Introduce Timeline::isWithin function that puts sourced vsync time
source into Unique, Shared and Outside categories.
BUG: 343603085
Test: atest VSyncPredictorTest
Flag: com.android.graphics.surfaceflinger.flags.vrr_bugfix_24q4
Change-Id: I99094e64c8403455158a6e794bd4d2ce32429f93
diff --git a/services/surfaceflinger/Scheduler/VSyncPredictor.cpp b/services/surfaceflinger/Scheduler/VSyncPredictor.cpp
index dd3c4b0..0644aca 100644
--- a/services/surfaceflinger/Scheduler/VSyncPredictor.cpp
+++ b/services/surfaceflinger/Scheduler/VSyncPredictor.cpp
@@ -360,7 +360,11 @@
purgeTimelines(now);
for (auto& timeline : mTimelines) {
- if (timeline.validUntil() && timeline.validUntil()->ns() > vsync) {
+ const bool isVsyncValid = FlagManager::getInstance().vrr_bugfix_24q4()
+ ? timeline.isWithin(TimePoint::fromNs(vsync)) ==
+ VsyncTimeline::VsyncOnTimeline::Unique
+ : timeline.validUntil() && timeline.validUntil()->ns() > vsync;
+ if (isVsyncValid) {
return timeline.isVSyncInPhase(model, vsync, frameRate);
}
}
@@ -395,8 +399,14 @@
mLastCommittedVsync = TimePoint::fromNs(0);
} else {
- mTimelines.back().freeze(
- TimePoint::fromNs(mLastCommittedVsync.ns() + mIdealPeriod.ns() / 2));
+ if (FlagManager::getInstance().vrr_bugfix_24q4()) {
+ // We need to freeze the timeline at the committed vsync so that we don't
+ // overshoot the deadline.
+ mTimelines.back().freeze(mLastCommittedVsync);
+ } else {
+ mTimelines.back().freeze(
+ TimePoint::fromNs(mLastCommittedVsync.ns() + mIdealPeriod.ns() / 2));
+ }
}
mTimelines.emplace_back(mLastCommittedVsync, mIdealPeriod, renderRate);
purgeTimelines(TimePoint::fromNs(mClock->now()));
@@ -611,7 +621,10 @@
while (mTimelines.size() > 1) {
const auto validUntilOpt = mTimelines.front().validUntil();
- if (validUntilOpt && *validUntilOpt < now) {
+ const bool isTimelineOutDated = FlagManager::getInstance().vrr_bugfix_24q4()
+ ? mTimelines.front().isWithin(now) == VsyncTimeline::VsyncOnTimeline::Outside
+ : validUntilOpt && *validUntilOpt < now;
+ if (isTimelineOutDated) {
mTimelines.pop_front();
} else {
break;
@@ -660,9 +673,12 @@
vsyncTime += missedVsync.fixup.ns();
ATRACE_FORMAT_INSTANT("lastFrameMissed");
} else if (mightBackpressure && lastVsyncOpt) {
- // lastVsyncOpt is based on the old timeline before we shifted it. we should correct it
- // first before trying to use it.
- lastVsyncOpt = snapToVsyncAlignedWithRenderRate(model, *lastVsyncOpt);
+ if (!FlagManager::getInstance().vrr_bugfix_24q4()) {
+ // lastVsyncOpt does not need to be corrected with the new rate, and
+ // it should be used as is to avoid skipping a frame when changing rates are
+ // aligned at vsync time.
+ lastVsyncOpt = snapToVsyncAlignedWithRenderRate(model, *lastVsyncOpt);
+ }
const auto vsyncDiff = vsyncTime - *lastVsyncOpt;
if (vsyncDiff <= minFramePeriodOpt->ns() - threshold) {
// avoid a duplicate vsync
@@ -681,7 +697,10 @@
}
ATRACE_FORMAT_INSTANT("vsync in %.2fms", float(vsyncTime - TimePoint::now().ns()) / 1e6f);
- if (mValidUntil && vsyncTime > mValidUntil->ns()) {
+ const bool isVsyncInvalid = FlagManager::getInstance().vrr_bugfix_24q4()
+ ? isWithin(TimePoint::fromNs(vsyncTime)) == VsyncOnTimeline::Outside
+ : mValidUntil && vsyncTime > mValidUntil->ns();
+ if (isVsyncInvalid) {
ATRACE_FORMAT_INSTANT("no longer valid for vsync in %.2f",
static_cast<float>(vsyncTime - TimePoint::now().ns()) / 1e6f);
return std::nullopt;
diff --git a/services/surfaceflinger/Scheduler/VSyncPredictor.h b/services/surfaceflinger/Scheduler/VSyncPredictor.h
index 8ce61d8..66a7d71 100644
--- a/services/surfaceflinger/Scheduler/VSyncPredictor.h
+++ b/services/surfaceflinger/Scheduler/VSyncPredictor.h
@@ -106,6 +106,24 @@
void shiftVsyncSequence(Duration phase);
void setRenderRate(std::optional<Fps> renderRateOpt) { mRenderRateOpt = renderRateOpt; }
+ enum class VsyncOnTimeline {
+ Unique, // Within timeline, not shared with next timeline.
+ Shared, // Within timeline, shared with next timeline.
+ Outside, // Outside of the timeline.
+ };
+ VsyncOnTimeline isWithin(TimePoint vsync) {
+ const auto threshold = mIdealPeriod.ns() / 2;
+ if (!mValidUntil || vsync.ns() < mValidUntil->ns() - threshold) {
+ // if mValidUntil is absent then timeline is not frozen and
+ // vsync should be unique to that timeline.
+ return VsyncOnTimeline::Unique;
+ }
+ if (vsync.ns() > mValidUntil->ns() + threshold) {
+ return VsyncOnTimeline::Outside;
+ }
+ return VsyncOnTimeline::Shared;
+ }
+
private:
nsecs_t snapToVsyncAlignedWithRenderRate(Model model, nsecs_t vsync);
VsyncSequence getVsyncSequenceLocked(Model, nsecs_t vsync);
diff --git a/services/surfaceflinger/tests/unittests/VSyncPredictorTest.cpp b/services/surfaceflinger/tests/unittests/VSyncPredictorTest.cpp
index 5109ea6..f36a8a6 100644
--- a/services/surfaceflinger/tests/unittests/VSyncPredictorTest.cpp
+++ b/services/surfaceflinger/tests/unittests/VSyncPredictorTest.cpp
@@ -673,6 +673,36 @@
EXPECT_THAT(tracker.nextAnticipatedVSyncTimeFrom(mNow + 5100), Eq(mNow + 6 * mPeriod));
}
+TEST_F(VSyncPredictorTest, setRenderRateWhenRenderRateGoesDown) {
+ SET_FLAG_FOR_TEST(flags::vrr_config, true);
+ SET_FLAG_FOR_TEST(flags::vrr_bugfix_24q4, true);
+
+ const int32_t kGroup = 0;
+ const auto kResolution = ui::Size(1920, 1080);
+ const auto vsyncRate = Fps::fromPeriodNsecs(500);
+ const auto minFrameRate = Fps::fromPeriodNsecs(1000);
+ hal::VrrConfig vrrConfig;
+ vrrConfig.minFrameIntervalNs = minFrameRate.getPeriodNsecs();
+ const ftl::NonNull<DisplayModePtr> kMode =
+ ftl::as_non_null(createDisplayModeBuilder(DisplayModeId(0), vsyncRate, kGroup,
+ kResolution, DEFAULT_DISPLAY_ID)
+ .setVrrConfig(std::move(vrrConfig))
+ .build());
+
+ VSyncPredictor vrrTracker{std::make_unique<ClockWrapper>(mClock), kMode, kHistorySize,
+ kMinimumSamplesForPrediction, kOutlierTolerancePercent};
+
+ Fps frameRate = Fps::fromPeriodNsecs(1000);
+ vrrTracker.setRenderRate(frameRate, /*applyImmediately*/ false);
+ vrrTracker.addVsyncTimestamp(0);
+ EXPECT_EQ(1000, vrrTracker.nextAnticipatedVSyncTimeFrom(700));
+ EXPECT_EQ(2000, vrrTracker.nextAnticipatedVSyncTimeFrom(1000, 1000));
+
+ frameRate = Fps::fromPeriodNsecs(3000);
+ vrrTracker.setRenderRate(frameRate, /*applyImmediately*/ false);
+ EXPECT_TRUE(vrrTracker.isVSyncInPhase(2000, frameRate));
+}
+
TEST_F(VSyncPredictorTest, setRenderRateHighIsAppliedImmediately) {
SET_FLAG_FOR_TEST(flags::vrr_config, true);