SurfaceFlinger: add allowed display configs to dumpsys

Dump the allowed display configs from SurfaceFlinger to help with
debugging issues where the refresh rate does not match the policy.

Test: adb shell dumpsys SurfaceFlinger
Bug: 136503733
Change-Id: I74ec7d08901ad9edb1a3706249e8809574bf1e5f

1 files changed, 10 insertions, 0 deletions

diff --git a/services/surfaceflinger/SurfaceFlinger.cpp b/services/surfaceflinger/SurfaceFlinger.cpp
index 6d9dc97c5a..94eeef5eef 100644
--- a/services/surfaceflinger/SurfaceFlinger.cpp
+++ b/services/surfaceflinger/SurfaceFlinger.cpp
@@ -4707,6 +4707,16 @@ void SurfaceFlinger::dumpVSync(std::string& result) const {
     StringAppendF(&result, "Scheduler enabled.");
     StringAppendF(&result, "+  Smart 90 for video detection: %s\n\n",
                   mUseSmart90ForVideo ? "on" : "off");
+    StringAppendF(&result, "Allowed Display Configs: ");
+    for (int32_t configId : mAllowedDisplayConfigs) {
+        for (auto refresh : mRefreshRateConfigs.getRefreshRates()) {
+            if (refresh.second && refresh.second->configId == configId) {
+                StringAppendF(&result, "%dHz, ", refresh.second->fps);
+            }
+        }
+    }
+    StringAppendF(&result, "(config override by backdoor: %s)\n\n",
+                  mDebugDisplayConfigSetByBackdoor ? "yes" : "no");
     mScheduler->dump(mAppConnectionHandle, result);
 }