charger: fix secondary display not turning off after first display was off

turn off both display after first display was turned off

Bug: 242967285
Test: charging animation can show in display correctly
Signed-off-by: Jack Wu <wjack@google.com>
Change-Id: Ie5741b49322aaf8a3750b1977fb203e4d0df3539

healthd/healthd_draw.cpp

@@ -99,7 +99,7 @@ void HealthdDraw::blank_screen(bool blank, int drm) {
     gr_fb_blank(blank, drm);
 }
 
-/* support screen rotation for foldable phone */
+// support screen rotation for foldable phone
 void HealthdDraw::rotate_screen(int drm) {
     if (!graphics_available) return;
     if (drm == 0)
@@ -108,6 +108,11 @@ void HealthdDraw::rotate_screen(int drm) {
         gr_rotate(GRRotation::NONE /* Portrait mode */);
 }
 
+// detect dual display
+bool HealthdDraw::has_multiple_connectors() {
+    return graphics_available && gr_has_multiple_connectors();
+}
+
 void HealthdDraw::clear_screen(void) {
     if (!graphics_available) return;
     gr_color(0, 0, 0, 255);

healthd/healthd_draw.h

@@ -38,6 +38,9 @@ class HealthdDraw {
   // Rotate screen.
   virtual void rotate_screen(int drm);
 
+  // Detect dual display
+  virtual bool has_multiple_connectors();
+
   static std::unique_ptr<HealthdDraw> Create(animation *anim);
 
  protected:

healthd/healthd_mode_charger.cpp

@@ -289,6 +289,18 @@ static void reset_animation(animation* anim) {
     anim->run = false;
 }
 
+void Charger::BlankSecScreen() {
+    int drm = drm_ == DRM_INNER ? 1 : 0;
+
+    if (!init_screen_) {
+        /* blank the secondary screen */
+        healthd_draw_->blank_screen(false, drm);
+        healthd_draw_->redraw_screen(&batt_anim_, surf_unknown_);
+        healthd_draw_->blank_screen(true, drm);
+        init_screen_ = true;
+    }
+}
+
 void Charger::UpdateScreenState(int64_t now) {
     int disp_time;
 
@@ -315,6 +327,9 @@ void Charger::UpdateScreenState(int64_t now) {
         reset_animation(&batt_anim_);
         next_screen_transition_ = -1;
         healthd_draw_->blank_screen(true, static_cast<int>(drm_));
+        if (healthd_draw_->has_multiple_connectors()) {
+            BlankSecScreen();
+        }
         screen_blanked_ = true;
         LOGV("[%" PRId64 "] animation done\n", now);
         if (configuration_->ChargerIsOnline()) {

healthd/include_charger/charger/healthd_mode_charger.h

@@ -108,9 +108,11 @@ class Charger {
     void InitAnimation();
     int RequestEnableSuspend();
     int RequestDisableSuspend();
+    void BlankSecScreen();
 
     bool have_battery_state_ = false;
     bool screen_blanked_ = false;
+    bool init_screen_ = false;
     int64_t next_screen_transition_ = 0;
     int64_t next_key_check_ = 0;
     int64_t next_pwr_check_ = 0;