commit f22e6acbb450853a4535b1628927aa93f799c53f
author Marin Shalamanov <shalamanov@google.com> Wed Feb 10 20:45:15 2021 +0100
committer Marin Shalamanov <shalamanov@google.com> Tue Mar 02 15:12:37 2021 +0100
tree ed585c6765219a0350117e85c18497c1b9fc526c
parent 6025467214c00568a5f903a1c82810c5dfef35be

SF: Sequential display mode IDs

If the supported display modes differ after a hotplug
assing the new modes new IDs. This way the old IDs will
self invalidate.

This breaks the assumption that the modes IDs are
equivalent to indices in the array of supported modes.

Bug: 159590486
Test: manually 0. device boots in 60hz mode
               1. switch to 50hz from app
               2. disconnect display
               3. reconnect display
      dumpsys SurfaceFlinger after each step to
      verify mode IDs change as expected
Change-Id: I44c90e8151f31e998b43649dad73c51d6948195d

services/surfaceflinger/DisplayDevice.h

diff --git a/services/surfaceflinger/DisplayDevice.h b/services/surfaceflinger/DisplayDevice.h
index a94bfa2..7156613 100644
--- a/services/surfaceflinger/DisplayDevice.h
+++ b/services/surfaceflinger/DisplayDevice.h
@@ -208,7 +208,7 @@
 
     hardware::graphics::composer::hal::PowerMode mPowerMode =
             hardware::graphics::composer::hal::PowerMode::OFF;
-    DisplayModeId mActiveModeId;
+    DisplayModePtr mActiveMode;
     const DisplayModes mSupportedModes;
 
     std::atomic<nsecs_t> mLastHwVsync = 0;