drm_hwcomposer: Clear connectors and CRTCs on Init

When DRM HWC starts, it resets all the connectors
and CRTCs to avoid the mimatch between drm hwc tracked
state and actual HW state programmed by the firmware
for the splash screen.

This fixes the MST connected boot issue.

Change-Id: I0773541b6bb227a2880d8442cc46411dc4c0127a
Signed-off-by: Manasi Navare <navaremanasi@google.com>

drm/DrmDevice.cpp

@@ -299,6 +299,35 @@ auto DrmDevice::RefreshConnectors() -> void {
   }
 }
 
+auto DrmDevice::ResetConnectorsAndCrtcs() -> void {
+  auto pset = MakeDrmModeAtomicReqUnique();
+  if (!pset) {
+    ALOGE("Failed to allocate property set");
+    return;
+  }
+  for (const auto &conn : connectors_) {
+    if (!conn->GetCrtcIdProperty().AtomicSet(*pset.get(), 0)) {
+      ALOGE("Failed to Set Crtc Id Prop to Null for Conn = %d", conn->GetId());
+      return;
+    }
+  }
+  for (const auto &crtc : crtcs_) {
+    if (!crtc->GetModeProperty().AtomicSet(*pset.get(), 0) ||
+        !crtc->GetActiveProperty().AtomicSet(*pset.get(), 0)) {
+      ALOGE(
+          "Failed to set Mode Property or Active Property to Null for CRTC = "
+          "%d",
+          crtc->GetId());
+      return;
+    }
+  }
+  auto err = drmModeAtomicCommit(*GetFd(), pset.get(),
+                                 DRM_MODE_ATOMIC_ALLOW_MODESET, this);
+  if (err != 0) {
+    ALOGE("Failed to commit pset ret=%d", err);
+  }
+}
+
 auto DrmDevice::GetPlanes() -> const std::vector<std::unique_ptr<DrmPlane>> & {
   return planes_;
 }

drm/DrmDevice.h

@@ -114,6 +114,7 @@ class DrmDevice {
   }
 
   auto RefreshConnectors() -> void;
+  auto ResetConnectorsAndCrtcs() -> void;
 
  private:
   explicit DrmDevice(ResourceManager *res_man, uint32_t index);

drm/ResourceManager.cpp

@@ -91,6 +91,10 @@ void ResourceManager::Init() {
     return;
   }
 
+  for (auto &drm : drms_) {
+    drm->ResetConnectorsAndCrtcs();
+  }
+
   uevent_listener_->RegisterHotplugHandler([this] {
     const std::unique_lock lock(GetMainLock());
     for (auto &drm : drms_) {