commit 9ebb7a721aecc1da1ee3f45846010fd3945e8e22
author Huihong Luo <huisinro@google.com> Tue Jun 27 17:01:50 2023 -0700
committer Huihong Luo <huisinro@google.com> Fri Dec 15 10:52:09 2023 -0800
tree 7b98a894dc0d266e579d69d1a9dfa067ab860448
parent 141aab9cb170a4b4948c35b8cc97316cdfa64e1e

Update HDCP for external displays

So the secure flag of Display object in Display Manager (DM) can
be set correctly. HWC calls the onSync method as a workaround,
to notify SurfaceFlinger (SF) about hdcp changes, SF in turn sends
an event to DM, DM will then fetch and update display info.

Bug: 280818362
Test: manual
Change-Id: I29ce0337865b51c0fc7bf7c2d7fdd4cd6d66ef46

services/surfaceflinger/Scheduler/EventThread.cpp

diff --git a/services/surfaceflinger/Scheduler/EventThread.cpp b/services/surfaceflinger/Scheduler/EventThread.cpp
index 693a357..56be1b1 100644
--- a/services/surfaceflinger/Scheduler/EventThread.cpp
+++ b/services/surfaceflinger/Scheduler/EventThread.cpp
@@ -100,6 +100,11 @@
         case DisplayEventReceiver::DISPLAY_EVENT_MODE_CHANGE:
             return StringPrintf("ModeChanged{displayId=%s, modeId=%u}",
                                 to_string(event.header.displayId).c_str(), event.modeChange.modeId);
+        case DisplayEventReceiver::DISPLAY_EVENT_HDCP_LEVELS_CHANGE:
+            return StringPrintf("HdcpLevelsChange{displayId=%s, connectedLevel=%d, maxLevel=%d}",
+                                to_string(event.header.displayId).c_str(),
+                                event.hdcpLevelsChange.connectedLevel,
+                                event.hdcpLevelsChange.maxLevel);
         default:
             return "Event{}";
     }
@@ -170,6 +175,20 @@
             }};
 }
 
+DisplayEventReceiver::Event makeHdcpLevelsChange(PhysicalDisplayId displayId,
+                                                 int32_t connectedLevel, int32_t maxLevel) {
+    return DisplayEventReceiver::Event{
+            .header =
+                    DisplayEventReceiver::Event::Header{
+                            .type = DisplayEventReceiver::DISPLAY_EVENT_HDCP_LEVELS_CHANGE,
+                            .displayId = displayId,
+                            .timestamp = systemTime(),
+                    },
+            .hdcpLevelsChange.connectedLevel = connectedLevel,
+            .hdcpLevelsChange.maxLevel = maxLevel,
+    };
+}
+
 } // namespace
 
 EventThreadConnection::EventThreadConnection(EventThread* eventThread, uid_t callingUid,
@@ -442,6 +461,14 @@
     mCondition.notify_all();
 }
 
+void EventThread::onHdcpLevelsChanged(PhysicalDisplayId displayId, int32_t connectedLevel,
+                                      int32_t maxLevel) {
+    std::lock_guard<std::mutex> lock(mMutex);
+
+    mPendingEvents.push_back(makeHdcpLevelsChange(displayId, connectedLevel, maxLevel));
+    mCondition.notify_all();
+}
+
 void EventThread::threadMain(std::unique_lock<std::mutex>& lock) {
     DisplayEventConsumers consumers;