drm/i915: Update atomic modeset state synchronously, v2.

All of this state should be updated as soon as possible. It shouldn't be
done later because then future updates may not depend on it.

Changes since v1:
- Move the modeset update to before drm_atomic_state_get. (Ville)
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1478609742-13603-10-git-send-email-maarten.lankhorst@linux.intel.comReviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

drivers/gpu/drm/i915/intel_display.c

@@ -14369,14 +14369,8 @@ static void intel_atomic_commit_tail(struct drm_atomic_state *state)
 
 	drm_atomic_helper_wait_for_dependencies(state);
 
-	if (intel_state->modeset) {
-		memcpy(dev_priv->min_pixclk, intel_state->min_pixclk,
-		       sizeof(intel_state->min_pixclk));
-		dev_priv->active_crtcs = intel_state->active_crtcs;
-		dev_priv->atomic_cdclk_freq = intel_state->cdclk;
-
+	if (intel_state->modeset)
 		intel_display_power_get(dev_priv, POWER_DOMAIN_MODESET);
-	}
 
 	for_each_crtc_in_state(state, crtc, old_crtc_state, i) {
 		struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
@@ -14609,6 +14603,13 @@ static int intel_atomic_commit(struct drm_device *dev,
 	intel_shared_dpll_commit(state);
 	intel_atomic_track_fbs(state);
 
+	if (intel_state->modeset) {
+		memcpy(dev_priv->min_pixclk, intel_state->min_pixclk,
+		       sizeof(intel_state->min_pixclk));
+		dev_priv->active_crtcs = intel_state->active_crtcs;
+		dev_priv->atomic_cdclk_freq = intel_state->cdclk;
+	}
+
 	drm_atomic_state_get(state);
 	INIT_WORK(&state->commit_work,
 		  nonblock ? intel_atomic_commit_work : NULL);