SF: trace display power state

Bug: 267195714
Test: manual
Change-Id: If518fabf16d91c1a58f7b68a5f4de0629df90fec

1 files changed, 13 insertions, 1 deletions

diff --git a/services/surfaceflinger/DisplayDevice.cpp b/services/surfaceflinger/DisplayDevice.cpp
index 5f73fbc1a6..a89b23cc28 100644
--- a/services/surfaceflinger/DisplayDevice.cpp
+++ b/services/surfaceflinger/DisplayDevice.cpp
@@ -181,11 +181,23 @@ void DisplayDevice::setPowerMode(hal::PowerMode mode) {
         getCompositionDisplay()->applyDisplayBrightness(true);
     }
 
-    mPowerMode = mode;
+    if (mPowerMode) {
+        *mPowerMode = mode;
+    } else {
+        mPowerMode.emplace("PowerMode -" + to_string(getId()), mode);
+    }
 
     getCompositionDisplay()->setCompositionEnabled(isPoweredOn());
 }
 
+void DisplayDevice::tracePowerMode() {
+    // assign the same value for tracing
+    if (mPowerMode) {
+        const hal::PowerMode powerMode = *mPowerMode;
+        *mPowerMode = powerMode;
+    }
+}
+
 void DisplayDevice::enableLayerCaching(bool enable) {
     getCompositionDisplay()->setLayerCachingEnabled(enable);
 }