drm/i915: Move check_digital_port_conflicts() earier

check_digital_port_conflicts() is done needlessly late. Move it earlier.
This will be needed as later on we want to set any_ms=true a bit later
for non-modesets too and we can't call this guy without the
connection_mutex held.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191015193035.25982-4-ville.syrjala@linux.intel.comReviewed-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>

drivers/gpu/drm/i915/display/intel_display.c

@@ -13718,11 +13718,6 @@ static int intel_modeset_checks(struct intel_atomic_state *state)
 	struct intel_crtc *crtc;
 	int ret, i;
 
-	if (!check_digital_port_conflicts(state)) {
-		DRM_DEBUG_KMS("rejecting conflicting digital port configuration\n");
-		return -EINVAL;
-	}
-
 	/* keep the current setting */
 	if (!state->cdclk.force_min_cdclk_changed)
 		state->cdclk.force_min_cdclk = dev_priv->cdclk.force_min_cdclk;
@@ -13884,6 +13879,12 @@ static int intel_atomic_check(struct drm_device *dev,
 			any_ms = true;
 	}
 
+	if (any_ms && !check_digital_port_conflicts(state)) {
+		DRM_DEBUG_KMS("rejecting conflicting digital port configuration\n");
+		ret = EINVAL;
+		goto fail;
+	}
+
 	ret = drm_dp_mst_atomic_check(&state->base);
 	if (ret)
 		goto fail;