[mutter] backends: Use fallback rotation if native DRM plane rotation failed

[Carlos Garnacho <carlosg src gnome org>]

commit e3dab707542cf3e528e4b4aa816d39e5cab0360a
Author: Carlos Garnacho <carlosg gnome org>
Date:   Fri Oct 7 16:52:43 2016 +0200

    backends: Use fallback rotation if native DRM plane rotation failed
    
    Blacklist the HW mode so we fallback gracefully to our own paths.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=772512

 src/backends/native/meta-monitor-manager-kms.c |   18 +++++++++++++-----
 1 files changed, 13 insertions(+), 5 deletions(-)
---
diff --git a/src/backends/native/meta-monitor-manager-kms.c b/src/backends/native/meta-monitor-manager-kms.c
index 2db7495..9daa010 100644
--- a/src/backends/native/meta-monitor-manager-kms.c
+++ b/src/backends/native/meta-monitor-manager-kms.c
@@ -1357,11 +1357,19 @@ meta_monitor_manager_kms_apply_configuration (MetaMonitorManager *manager,
       else
         hw_transform = META_MONITOR_TRANSFORM_NORMAL;
 
-      drmModeObjectSetProperty (manager_kms->fd,
-                                crtc_kms->primary_plane_id,
-                                DRM_MODE_OBJECT_PLANE,
-                                crtc_kms->rotation_prop_id,
-                                crtc_kms->rotation_map[hw_transform]);
+      if (drmModeObjectSetProperty (manager_kms->fd,
+                                    crtc_kms->primary_plane_id,
+                                    DRM_MODE_OBJECT_PLANE,
+                                    crtc_kms->rotation_prop_id,
+                                    crtc_kms->rotation_map[hw_transform]) != 0)
+        {
+          g_warning ("Failed to apply DRM plane transform: %m", hw_transform);
+
+          /* Blacklist this HW transform, we want to fallback to our
+           * fallbacks in this case.
+           */
+          crtc_kms->all_hw_transforms &= ~(1 << hw_transform);
+        }
     }
   /* Disable CRTCs not mentioned in the list (they have is_dirty == FALSE,
      because they weren't seen in the first loop) */