renderer-native: Always post device wide updates during mode set

Don't mode set each CRTC in separate KMS updates, as reconfiguring one
CRTC might cause other CRTCs to be implicitly reset thus as well,
causing KMS return EBUSY if using atomic modesetting.

Prepare for this by compositing each CRTC first including adding steps
to the KMS update, but wait until all views has rendered at least once
before posting the initial update. After this each CRTC is posted
separately.

Using EGLStreams instead of normal page flipping seems to fail when
doing this though, so handle that the old way for the EGLStream case,
i.e. eglSwapBuffers() -> mode set with dumb buffer -> eglStream
"acquire" (resulting in page flip under the hood).

For this we also introduce a new error code so that we don't use client
buffers when doing mode sets, which could accidentally configure the
CRTC in a way that is incompatible with the primary plane buffers.

Do the same also when we're in power save mode, to only have one special
case path for this scenario in the regular swap-buffer path.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1488>

clutter/clutter/clutter-private.h

@@ -264,6 +264,12 @@ clutter_round_to_256ths (float *f)
   *f = roundf ((*f) * 256) / 256;
 }
 
+static inline uint64_t
+ns (uint64_t ns)
+{
+  return ns;
+}
+
 static inline int64_t
 us (int64_t us)
 {
@@ -282,6 +288,12 @@ ms2us (int64_t ms)
   return us (ms * 1000);
 }
 
+static inline int64_t
+us2ns (int64_t us)
+{
+  return ns (us * 1000);
+}
+
 static inline int64_t
 us2ms (int64_t us)
 {

clutter/clutter/cogl/clutter-stage-cogl.c

@@ -722,7 +722,10 @@ clutter_stage_cogl_redraw_view (ClutterStageWindow *stage_window,
                                            &error))
         return;
 
-      g_warning ("Failed to scan out client buffer: %s", error->message);
+      if (!g_error_matches (error,
+                            COGL_SCANOUT_ERROR,
+                            COGL_SCANOUT_ERROR_INHIBITED))
+        g_warning ("Failed to scan out client buffer: %s", error->message);
     }
 
   clutter_stage_cogl_redraw_view_primary (stage_cogl, view, frame);