通过hal层根据优先级绑定，优先级越高送显越靠前。（sdk默认mipi优先级最高为主显）

1.双显

如edp主+mipi副，edp优先级搞。

更改如下

diff --git a/hwc-hal/drm/drmConnector.cpp b/hwc-hal/drm/drmConnector.cpp
--- a/hwc-hal/drm/drmConnector.cpp
+++ b/hwc-hal/drm/drmConnector.cpp
@@ -327,9 +327,9 @@ std::string DrmConnector::encoderInfoString() const
 int DrmConnector::priority() const
 {
     switch (mType) {
-        case DRM_MODE_CONNECTOR_DSI        : return 102;
+        case DRM_MODE_CONNECTOR_DSI        : return 100;
         case DRM_MODE_CONNECTOR_LVDS       : return 101;
-        case DRM_MODE_CONNECTOR_eDP        : return 100;
+        case DRM_MODE_CONNECTOR_eDP        : return 102;
         case DRM_MODE_CONNECTOR_HDMIA      : return 4;
         case DRM_MODE_CONNECTOR_HDMIB      : return 4;
         case DRM_MODE_CONNECTOR_DisplayPort: return 3;

三显

如 edp主+mip副 默认 插hdmi后hdmi优先显示。

--- a/hwc-hal/drm/drmConnector.cpp
+++ b/hwc-hal/drm/drmConnector.cpp
@@ -329,8 +329,8 @@ int DrmConnector::priority() const
     switch (mType) {
         case DRM_MODE_CONNECTOR_DSI        : return 102;
         case DRM_MODE_CONNECTOR_LVDS       : return 101;
-        case DRM_MODE_CONNECTOR_eDP        : return 100;
-        case DRM_MODE_CONNECTOR_HDMIA      : return 4;
+        case DRM_MODE_CONNECTOR_eDP        : return 104;
+        case DRM_MODE_CONNECTOR_HDMIA      : return 103;
         case DRM_MODE_CONNECTOR_HDMIB      : return 4;
         case DRM_MODE_CONNECTOR_DisplayPort: return 3;
         case DRM_MODE_CONNECTOR_Composite  : return 2;
diff --git a/hwc-hal/common/Display.cpp b/hwc-hal/common/Display.cpp
--- a/hwc-hal/common/Display.cpp
+++ b/hwc-hal/common/Display.cpp
@@ -67,8 +67,9 @@ HWC2::Error Display::hotplugIn(int32_t id)
 {
     mHandle = id;
 
-    mLayerStack.clear();
+    // mLayerStack.clear();
     mConnection = mDeviceManager->createDeviceConnection(id);
+    initDisplayConfig();
     mConnection.setDisplayEventCallback(this);
     mConnection->skipFrameEnable(!primaryDisplay());