SF: Tune RefreshRateConfigs for close refresh rates
Partial cherry-pick of 15a0fc65eedb633f4fbf988e4a319452ddaebdcc
to fix seen in CTS
Bug: 196404992
Bug: 196191168
Test: atest CtsDisplayTestCases.android.display.cts.DisplayTest#testModeSwitchOnPrimaryDisplay
Change-Id: I9f8abac183bf6255fed4e2481d22aa3eb42b72ac
Merged-In: I694e2aa5b16e9b4e0f6d1e8263b1ac35099605fd
diff --git a/services/surfaceflinger/Scheduler/RefreshRateConfigs.cpp b/services/surfaceflinger/Scheduler/RefreshRateConfigs.cpp
index 0334d70..73b7b63 100644
--- a/services/surfaceflinger/Scheduler/RefreshRateConfigs.cpp
+++ b/services/surfaceflinger/Scheduler/RefreshRateConfigs.cpp
@@ -911,7 +911,10 @@
int RefreshRateConfigs::getFrameRateDivider(Fps displayFrameRate, Fps layerFrameRate) {
// This calculation needs to be in sync with the java code
// in DisplayManagerService.getDisplayInfoForFrameRateOverride
- constexpr float kThreshold = 0.1f;
+
+ // The threshold must be smaller than 0.001 in order to differentiate
+ // between the fractional pairs (e.g. 59.94 and 60).
+ constexpr float kThreshold = 0.0009f;
const auto numPeriods = displayFrameRate.getValue() / layerFrameRate.getValue();
const auto numPeriodsRounded = std::round(numPeriods);
if (std::abs(numPeriods - numPeriodsRounded) > kThreshold) {
diff --git a/services/surfaceflinger/tests/unittests/RefreshRateConfigsTest.cpp b/services/surfaceflinger/tests/unittests/RefreshRateConfigsTest.cpp
index 3423bd5..3b2bd81 100644
--- a/services/surfaceflinger/tests/unittests/RefreshRateConfigsTest.cpp
+++ b/services/surfaceflinger/tests/unittests/RefreshRateConfigsTest.cpp
@@ -2123,7 +2123,11 @@
refreshRateConfigs->setCurrentModeId(HWC_CONFIG_ID_90);
displayRefreshRate = refreshRateConfigs->getCurrentRefreshRate().getFps();
EXPECT_EQ(4, RefreshRateConfigs::getFrameRateDivider(displayRefreshRate, Fps(22.5f)));
- EXPECT_EQ(4, RefreshRateConfigs::getFrameRateDivider(displayRefreshRate, Fps(22.6f)));
+
+ EXPECT_EQ(0, RefreshRateConfigs::getFrameRateDivider(Fps(24.f), Fps(25.f)));
+ EXPECT_EQ(0, RefreshRateConfigs::getFrameRateDivider(Fps(24.f), Fps(23.976f)));
+ EXPECT_EQ(0, RefreshRateConfigs::getFrameRateDivider(Fps(30.f), Fps(29.97f)));
+ EXPECT_EQ(0, RefreshRateConfigs::getFrameRateDivider(Fps(60.f), Fps(59.94f)));
}
TEST_F(RefreshRateConfigsTest, getFrameRateOverrides_noLayers) {