ozone: Select a crtc even when KMS doesn't report any plane for it.

ui/ozone/platform/drm/common/drm_util.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/ozone/platform/drm/common/drm_util.h"
 
 #include <drm_fourcc.h>
 #include <stdint.h>
 #include <stdlib.h>
 #include <sys/mman.h>
@@ skipping 54 matching lines @@
                  drmModeConnector* connector,
                  drmModeRes* resources,
                  const ScopedVector<HardwareDisplayControllerInfo>& displays) {
   ScopedDrmPlaneResPtr plane_resources(drmModeGetPlaneResources(fd));
   std::vector<ScopedDrmPlanePtr> planes;
   for (uint32_t i = 0; i < plane_resources->count_planes; i++)
     planes.emplace_back(drmModeGetPlane(fd, plane_resources->planes[i]));
 
   DCHECK_GE(32, resources->count_crtcs);
   uint32_t best_crtc = 0;
-  int best_crtc_planes = 0;
+  int best_crtc_planes = -1;
 
   // Try to find an encoder for the connector.
   for (int i = 0; i < connector->count_encoders; ++i) {
     ScopedDrmEncoderPtr encoder(drmModeGetEncoder(fd, connector->encoders[i]));
     if (!encoder)
       continue;
 
     for (int j = 0; j < resources->count_crtcs; ++j) {
       // Check if the encoder is compatible with this CRTC
       int crtc_bit = 1 << j;
@@ skipping 363 matching lines @@
     case gfx::BufferFormat::BGR_565:
       return DRM_FORMAT_RGB565;
     case gfx::BufferFormat::UYVY_422:
       return DRM_FORMAT_UYVY;
     default:
       NOTREACHED();
       return 0;
   }
 }
 }  // namespace ui