libhwc2.1: add getRefreshRate() and getVsyncPeriod() functions

Bug: 250979028
Change-Id: I66c9fbc05b42c6376ec852ee1555b2655ea9635b
Signed-off-by: Shiyong Li <shiyongli@google.com>

2 files changed, 15 insertions, 0 deletions

diff --git a/libhwc2.1/libdevice/ExynosDisplay.cpp b/libhwc2.1/libdevice/ExynosDisplay.cpp
index d050dee..7d23696 100644
--- a/libhwc2.1/libdevice/ExynosDisplay.cpp
+++ b/libhwc2.1/libdevice/ExynosDisplay.cpp
@@ -6284,3 +6284,16 @@ void ExynosDisplay::updateRefreshRateIndicator() {
         return;
     mRefreshRateIndicatorHandler->handleSysfsEvent();
 }
+
+VsyncPeriodNanos ExynosDisplay::getVsyncPeriod(const int32_t config) {
+    const auto &it = mDisplayConfigs.find(config);
+    if (it == mDisplayConfigs.end()) return 0;
+    return mDisplayConfigs[config].vsyncPeriod;
+}
+
+uint32_t ExynosDisplay::getRefreshRate(const int32_t config) {
+    VsyncPeriodNanos period = getVsyncPeriod(config);
+    if (!period) return 0;
+    constexpr float nsecsPerSec = std::chrono::nanoseconds(1s).count();
+    return round(nsecsPerSec / period * 0.1f) * 10;
+}
diff --git a/libhwc2.1/libdevice/ExynosDisplay.h b/libhwc2.1/libdevice/ExynosDisplay.h
index 65dd936..41c6a93 100644
--- a/libhwc2.1/libdevice/ExynosDisplay.h
+++ b/libhwc2.1/libdevice/ExynosDisplay.h
@@ -1290,6 +1290,8 @@ class ExynosDisplay {
             float opRate = mOperationRateManager ? mOperationRateManager->getOperationRate() : 0;
             return static_cast<uint32_t>(std::round(opRate ?: mPeakRefreshRate));
         }
+        VsyncPeriodNanos getVsyncPeriod(const int32_t config);
+        uint32_t getRefreshRate(const int32_t config);
 
         // check if there are any dimmed layers
         bool isMixedComposition();