7 files changed, 153 insertions, 76 deletions

diff --git a/minui/graphics.cpp b/minui/graphics.cpp
index f25694ab5..597f2ceaf 100644
--- a/minui/graphics.cpp
+++ b/minui/graphics.cpp
@@ -450,6 +450,10 @@ void gr_fb_blank(bool blank) {
   gr_backend->Blank(blank);
 }
 
+void gr_fb_blank(bool blank, int index) {
+  gr_backend->Blank(blank, static_cast<MinuiBackend::DrmConnector>(index));
+}
+
 void gr_rotate(GRRotation rot) {
   rotation = rot;
 }
diff --git a/minui/graphics.h b/minui/graphics.h
index 3c45a406b..5408c93e9 100644
--- a/minui/graphics.h
+++ b/minui/graphics.h
@@ -21,6 +21,12 @@
 
 class MinuiBackend {
  public:
+  enum DrmConnector {
+    DRM_MAIN = 0,
+    DRM_SEC,
+    DRM_MAX,
+  };
+
   // Initializes the backend and returns a GRSurface* to draw into.
   virtual GRSurface* Init() = 0;
 
@@ -28,9 +34,12 @@ class MinuiBackend {
   // be displayed, and returns a new drawing surface.
   virtual GRSurface* Flip() = 0;
 
-  // Blank (or unblank) the screen.
+  // Blank (or unblank) the default screen.
   virtual void Blank(bool) = 0;
 
+  // Blank (or unblank) the specific screen.
+  virtual void Blank(bool blank, DrmConnector index) = 0;
+
   // Device cleanup when drawing is done.
   virtual ~MinuiBackend() {};
 };
diff --git a/minui/graphics_drm.cpp b/minui/graphics_drm.cpp
index 9d31ff7a9..c55702276 100644
--- a/minui/graphics_drm.cpp
+++ b/minui/graphics_drm.cpp
@@ -153,22 +153,50 @@ void MinuiBackendDrm::DrmDisableCrtc(int drm_fd, drmModeCrtc* crtc) {
 }
 
 bool MinuiBackendDrm::DrmEnableCrtc(int drm_fd, drmModeCrtc* crtc,
-                                    const std::unique_ptr<GRSurfaceDrm>& surface) {
+                                    const std::unique_ptr<GRSurfaceDrm>& surface,
+                                    uint32_t* connector_id) {
   if (drmModeSetCrtc(drm_fd, crtc->crtc_id, surface->fb_id, 0, 0,  // x,y
-                     &main_monitor_connector->connector_id,
-                     1,  // connector_count
-                     &main_monitor_crtc->mode) != 0) {
-    perror("Failed to drmModeSetCrtc");
+                     connector_id, 1,                              // connector_count
+                     &crtc->mode) != 0) {
+    fprintf(stderr, "Failed to drmModeSetCrtc(%d)\n", *connector_id);
     return false;
   }
+
   return true;
 }
 
 void MinuiBackendDrm::Blank(bool blank) {
+  Blank(blank, DRM_MAIN);
+}
+
+void MinuiBackendDrm::Blank(bool blank, DrmConnector index) {
+  const auto* drmInterface = &drm[DRM_MAIN];
+
+  switch (index) {
+    case DRM_MAIN:
+      drmInterface = &drm[DRM_MAIN];
+      break;
+    case DRM_SEC:
+      drmInterface = &drm[DRM_SEC];
+      break;
+    default:
+      fprintf(stderr, "Invalid index: %d\n", index);
+      return;
+  }
+
+  if (!drmInterface->monitor_connector) {
+    fprintf(stderr, "Unsupported. index = %d\n", index);
+    return;
+  }
+
   if (blank) {
-    DrmDisableCrtc(drm_fd, main_monitor_crtc);
+    DrmDisableCrtc(drm_fd, drmInterface->monitor_crtc);
   } else {
-    DrmEnableCrtc(drm_fd, main_monitor_crtc, GRSurfaceDrms[current_buffer]);
+    DrmEnableCrtc(drm_fd, drmInterface->monitor_crtc,
+                  drmInterface->GRSurfaceDrms[drmInterface->current_buffer],
+                  &drmInterface->monitor_connector->connector_id);
+
+    active_display = index;
   }
 }
 
@@ -210,18 +238,21 @@ static drmModeCrtc* find_crtc_for_connector(int fd, drmModeRes* resources,
   return nullptr;
 }
 
-static drmModeConnector* find_used_connector_by_type(int fd, drmModeRes* resources, unsigned type) {
+std::vector<drmModeConnector*> find_used_connector_by_type(int fd, drmModeRes* resources,
+                                                           unsigned type) {
+  std::vector<drmModeConnector*> drmConnectors;
   for (int i = 0; i < resources->count_connectors; i++) {
     drmModeConnector* connector = drmModeGetConnector(fd, resources->connectors[i]);
     if (connector) {
       if ((connector->connector_type == type) && (connector->connection == DRM_MODE_CONNECTED) &&
           (connector->count_modes > 0)) {
-        return connector;
+        drmConnectors.push_back(connector);
+      } else {
+        drmModeFreeConnector(connector);
       }
-      drmModeFreeConnector(connector);
     }
   }
-  return nullptr;
+  return drmConnectors;
 }
 
 static drmModeConnector* find_first_connected_connector(int fd, drmModeRes* resources) {
@@ -239,8 +270,7 @@ static drmModeConnector* find_first_connected_connector(int fd, drmModeRes* reso
   return nullptr;
 }
 
-drmModeConnector* MinuiBackendDrm::FindMainMonitor(int fd, drmModeRes* resources,
-                                                   uint32_t* mode_index) {
+bool MinuiBackendDrm::FindAndSetMonitor(int fd, drmModeRes* resources) {
   /* Look for LVDS/eDP/DSI connectors. Those are the main screens. */
   static constexpr unsigned kConnectorPriority[] = {
     DRM_MODE_CONNECTOR_LVDS,
@@ -248,37 +278,41 @@ drmModeConnector* MinuiBackendDrm::FindMainMonitor(int fd, drmModeRes* resources
     DRM_MODE_CONNECTOR_DSI,
   };
 
-  drmModeConnector* main_monitor_connector = nullptr;
-  unsigned i = 0;
-  do {
-    main_monitor_connector = find_used_connector_by_type(fd, resources, kConnectorPriority[i]);
-    i++;
-  } while (!main_monitor_connector && i < arraysize(kConnectorPriority));
+  std::vector<drmModeConnector*> drmConnectors;
+  for (int i = 0; i < arraysize(kConnectorPriority) && drmConnectors.size() < DRM_MAX; i++) {
+    auto connectors = find_used_connector_by_type(fd, resources, kConnectorPriority[i]);
+    for (auto connector : connectors) {
+      drmConnectors.push_back(connector);
+      if (drmConnectors.size() >= DRM_MAX) break;
+    }
+  }
 
   /* If we didn't find a connector, grab the first one that is connected. */
-  if (!main_monitor_connector) {
-    main_monitor_connector = find_first_connected_connector(fd, resources);
+  if (drmConnectors.empty()) {
+    drmModeConnector* connector = find_first_connected_connector(fd, resources);
+    if (connector) {
+      drmConnectors.push_back(connector);
+    }
   }
 
-  /* If we still didn't find a connector, give up and return. */
-  if (!main_monitor_connector) return nullptr;
-
-  for (int modes = 0; modes < main_monitor_connector->count_modes; modes++) {
-    printf("Display Mode %d resolution: %d x %d @ %d FPS\n", modes,
-           main_monitor_connector->modes[modes].hdisplay,
-           main_monitor_connector->modes[modes].vdisplay,
-           main_monitor_connector->modes[modes].vrefresh);
-  }
-  *mode_index = 0;
-  for (int modes = 0; modes < main_monitor_connector->count_modes; modes++) {
-    if (main_monitor_connector->modes[modes].type & DRM_MODE_TYPE_PREFERRED) {
-      printf("Choosing display mode #%d\n", modes);
-      *mode_index = modes;
-      break;
+  for (int drm_index = 0; drm_index < drmConnectors.size(); drm_index++) {
+    drm[drm_index].monitor_connector = drmConnectors[drm_index];
+
+    drm[drm_index].selected_mode = 0;
+    for (int modes = 0; modes < drmConnectors[drm_index]->count_modes; modes++) {
+      printf("Display Mode %d resolution: %d x %d @ %d FPS\n", modes,
+             drmConnectors[drm_index]->modes[modes].hdisplay,
+             drmConnectors[drm_index]->modes[modes].vdisplay,
+             drmConnectors[drm_index]->modes[modes].vrefresh);
+      if (drmConnectors[drm_index]->modes[modes].type & DRM_MODE_TYPE_PREFERRED) {
+        printf("Choosing display mode #%d\n", modes);
+        drm[drm_index].selected_mode = modes;
+        break;
+      }
     }
   }
 
-  return main_monitor_connector;
+  return drmConnectors.size() > 0;
 }
 
 void MinuiBackendDrm::DisableNonMainCrtcs(int fd, drmModeRes* resources, drmModeCrtc* main_crtc) {
@@ -329,46 +363,49 @@ GRSurface* MinuiBackendDrm::Init() {
     return nullptr;
   }
 
-  uint32_t selected_mode;
-  main_monitor_connector = FindMainMonitor(drm_fd, res, &selected_mode);
-  if (!main_monitor_connector) {
-    fprintf(stderr, "Failed to find main_monitor_connector\n");
+  if (!FindAndSetMonitor(drm_fd, res)) {
+    fprintf(stderr, "Failed to find main monitor_connector\n");
     drmModeFreeResources(res);
-    close(drm_fd);
     return nullptr;
   }
 
-  main_monitor_crtc = find_crtc_for_connector(drm_fd, res, main_monitor_connector);
-  if (!main_monitor_crtc) {
-    fprintf(stderr, "Failed to find main_monitor_crtc\n");
-    drmModeFreeResources(res);
-    close(drm_fd);
-    return nullptr;
-  }
-
-  DisableNonMainCrtcs(drm_fd, res, main_monitor_crtc);
+  for (int i = 0; i < DRM_MAX; i++) {
+    if (drm[i].monitor_connector) {
+      drm[i].monitor_crtc = find_crtc_for_connector(drm_fd, res, drm[i].monitor_connector);
+      if (!drm[i].monitor_crtc) {
+        fprintf(stderr, "Failed to find monitor_crtc, drm index=%d\n", i);
+        drmModeFreeResources(res);
+        return nullptr;
+      }
 
-  main_monitor_crtc->mode = main_monitor_connector->modes[selected_mode];
+      drm[i].monitor_crtc->mode = drm[i].monitor_connector->modes[drm[i].selected_mode];
 
-  int width = main_monitor_crtc->mode.hdisplay;
-  int height = main_monitor_crtc->mode.vdisplay;
+      int width = drm[i].monitor_crtc->mode.hdisplay;
+      int height = drm[i].monitor_crtc->mode.vdisplay;
 
-  drmModeFreeResources(res);
+      drm[i].GRSurfaceDrms[0] = GRSurfaceDrm::Create(drm_fd, width, height);
+      drm[i].GRSurfaceDrms[1] = GRSurfaceDrm::Create(drm_fd, width, height);
+      if (!drm[i].GRSurfaceDrms[0] || !drm[i].GRSurfaceDrms[1]) {
+        fprintf(stderr, "Failed to create GRSurfaceDrm, drm index=%d\n", i);
+        drmModeFreeResources(res);
+        return nullptr;
+      }
 
-  GRSurfaceDrms[0] = GRSurfaceDrm::Create(drm_fd, width, height);
-  GRSurfaceDrms[1] = GRSurfaceDrm::Create(drm_fd, width, height);
-  if (!GRSurfaceDrms[0] || !GRSurfaceDrms[1]) {
-    return nullptr;
+      drm[i].current_buffer = 0;
+    }
   }
 
-  current_buffer = 0;
+  DisableNonMainCrtcs(drm_fd, res, drm[DRM_MAIN].monitor_crtc);
+
+  drmModeFreeResources(res);
 
   // We will likely encounter errors in the backend functions (i.e. Flip) if EnableCrtc fails.
-  if (!DrmEnableCrtc(drm_fd, main_monitor_crtc, GRSurfaceDrms[1])) {
+  if (!DrmEnableCrtc(drm_fd, drm[DRM_MAIN].monitor_crtc, drm[DRM_MAIN].GRSurfaceDrms[1],
+                     &drm[DRM_MAIN].monitor_connector->connector_id)) {
     return nullptr;
   }
 
-  return GRSurfaceDrms[0].get();
+  return drm[DRM_MAIN].GRSurfaceDrms[0].get();
 }
 
 static void page_flip_complete(__unused int fd,
@@ -380,10 +417,19 @@ static void page_flip_complete(__unused int fd,
 }
 
 GRSurface* MinuiBackendDrm::Flip() {
+  GRSurface* surface = NULL;
+  DrmInterface* current_drm = &drm[active_display];
   bool ongoing_flip = true;
-  if (drmModePageFlip(drm_fd, main_monitor_crtc->crtc_id, GRSurfaceDrms[current_buffer]->fb_id,
+
+  if (!current_drm->monitor_connector) {
+    fprintf(stderr, "Unsupported. active_display = %d\n", active_display);
+    return nullptr;
+  }
+
+  if (drmModePageFlip(drm_fd, current_drm->monitor_crtc->crtc_id,
+                      current_drm->GRSurfaceDrms[current_drm->current_buffer]->fb_id,
                       DRM_MODE_PAGE_FLIP_EVENT, &ongoing_flip) != 0) {
-    perror("Failed to drmModePageFlip");
+    fprintf(stderr, "Failed to drmModePageFlip, active_display=%d", active_display);
     return nullptr;
   }
 
@@ -409,14 +455,19 @@ GRSurface* MinuiBackendDrm::Flip() {
     }
   }
 
-  current_buffer = 1 - current_buffer;
-  return GRSurfaceDrms[current_buffer].get();
+  current_drm->current_buffer = 1 - current_drm->current_buffer;
+  surface = current_drm->GRSurfaceDrms[current_drm->current_buffer].get();
+  return surface;
 }
 
 MinuiBackendDrm::~MinuiBackendDrm() {
-  DrmDisableCrtc(drm_fd, main_monitor_crtc);
-  drmModeFreeCrtc(main_monitor_crtc);
-  drmModeFreeConnector(main_monitor_connector);
+  for (int i = 0; i < DRM_MAX; i++) {
+    if (drm[i].monitor_connector) {
+      DrmDisableCrtc(drm_fd, drm[i].monitor_crtc);
+      drmModeFreeCrtc(drm[i].monitor_crtc);
+      drmModeFreeConnector(drm[i].monitor_connector);
+    }
+  }
   close(drm_fd);
   drm_fd = -1;
 }
diff --git a/minui/graphics_drm.h b/minui/graphics_drm.h
index 57ba39b83..fe3beaff9 100644
--- a/minui/graphics_drm.h
+++ b/minui/graphics_drm.h
@@ -59,16 +59,23 @@ class MinuiBackendDrm : public MinuiBackend {
   GRSurface* Init() override;
   GRSurface* Flip() override;
   void Blank(bool) override;
+  void Blank(bool blank, DrmConnector index) override;
 
  private:
   void DrmDisableCrtc(int drm_fd, drmModeCrtc* crtc);
-  bool DrmEnableCrtc(int drm_fd, drmModeCrtc* crtc, const std::unique_ptr<GRSurfaceDrm>& surface);
+  bool DrmEnableCrtc(int drm_fd, drmModeCrtc* crtc, const std::unique_ptr<GRSurfaceDrm>& surface,
+                     uint32_t* conntcors);
   void DisableNonMainCrtcs(int fd, drmModeRes* resources, drmModeCrtc* main_crtc);
-  drmModeConnector* FindMainMonitor(int fd, drmModeRes* resources, uint32_t* mode_index);
+  bool FindAndSetMonitor(int fd, drmModeRes* resources);
+
+  struct DrmInterface {
+    std::unique_ptr<GRSurfaceDrm> GRSurfaceDrms[2];
+    int current_buffer{ 0 };
+    drmModeCrtc* monitor_crtc{ nullptr };
+    drmModeConnector* monitor_connector{ nullptr };
+    uint32_t selected_mode{ 0 };
+  } drm[DRM_MAX];
 
-  std::unique_ptr<GRSurfaceDrm> GRSurfaceDrms[2];
-  int current_buffer{ 0 };
-  drmModeCrtc* main_monitor_crtc{ nullptr };
-  drmModeConnector* main_monitor_connector{ nullptr };
   int drm_fd{ -1 };
+  DrmConnector active_display = DRM_MAIN;
 };
diff --git a/minui/graphics_fbdev.cpp b/minui/graphics_fbdev.cpp
index 0d0fabce6..1cb0c0ab8 100644
--- a/minui/graphics_fbdev.cpp
+++ b/minui/graphics_fbdev.cpp
@@ -43,6 +43,10 @@ void MinuiBackendFbdev::Blank(bool blank) {
   if (ret < 0) perror("ioctl(): blank");
 }
 
+void MinuiBackendFbdev::Blank(bool blank, DrmConnector index) {
+  fprintf(stderr, "Unsupported multiple connectors, blank = %d, index = %d\n", blank, index);
+}
+
 void MinuiBackendFbdev::SetDisplayedFramebuffer(size_t n) {
   if (n > 1 || !double_buffered) return;
 
diff --git a/minui/graphics_fbdev.h b/minui/graphics_fbdev.h
index 596ba74ea..7e193c4ff 100644
--- a/minui/graphics_fbdev.h
+++ b/minui/graphics_fbdev.h
@@ -56,6 +56,7 @@ class MinuiBackendFbdev : public MinuiBackend {
   GRSurface* Init() override;
   GRSurface* Flip() override;
   void Blank(bool) override;
+  void Blank(bool blank, DrmConnector index) override;
 
  private:
   void SetDisplayedFramebuffer(size_t n);
diff --git a/minui/include/minui/minui.h b/minui/include/minui/minui.h
index 5470457e7..6a762b6a5 100644
--- a/minui/include/minui/minui.h
+++ b/minui/include/minui/minui.h
@@ -127,6 +127,7 @@ int gr_fb_height();
 
 void gr_flip();
 void gr_fb_blank(bool blank);
+void gr_fb_blank(bool blank, int index);
 
 // Clears entire surface to current color.
 void gr_clear();