drm/i915: Factor out a helper to check/compute all the CRTC states

Factor out intel_atomic_check_config() to check and compute all the CRTC
states. This will be used by a follow up patch to recompute/check the
state until required by BW limitations between CRTCs.
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230921195159.2646027-9-imre.deak@intel.com

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

@@ -6283,6 +6283,51 @@ static int intel_bigjoiner_add_affected_crtcs(struct intel_atomic_state *state)
 	return 0;
 }
 
+static int intel_atomic_check_config(struct intel_atomic_state *state)
+{
+	struct drm_i915_private *i915 = to_i915(state->base.dev);
+	struct intel_crtc_state *new_crtc_state;
+	struct intel_crtc *crtc;
+	int ret;
+	int i;
+
+	ret = intel_bigjoiner_add_affected_crtcs(state);
+	if (ret)
+		return ret;
+
+	for_each_new_intel_crtc_in_state(state, crtc, new_crtc_state, i) {
+		if (!intel_crtc_needs_modeset(new_crtc_state)) {
+			if (intel_crtc_is_bigjoiner_slave(new_crtc_state))
+				copy_bigjoiner_crtc_state_nomodeset(state, crtc);
+			else
+				intel_crtc_copy_uapi_to_hw_state_nomodeset(state, crtc);
+			continue;
+		}
+
+		if (intel_crtc_is_bigjoiner_slave(new_crtc_state)) {
+			drm_WARN_ON(&i915->drm, new_crtc_state->uapi.enable);
+			continue;
+		}
+
+		ret = intel_crtc_prepare_cleared_state(state, crtc);
+		if (ret)
+			break;
+
+		if (!new_crtc_state->hw.enable)
+			continue;
+
+		ret = intel_modeset_pipe_config(state, crtc);
+		if (ret)
+			break;
+
+		ret = intel_atomic_check_bigjoiner(state, crtc);
+		if (ret)
+			break;
+	}
+
+	return ret;
+}
+
 /**
  * intel_atomic_check - validate state object
  * @dev: drm device
@@ -6327,41 +6372,10 @@ int intel_atomic_check(struct drm_device *dev,
 			return ret;
 	}
 
-	ret = intel_bigjoiner_add_affected_crtcs(state);
+	ret = intel_atomic_check_config(state);
 	if (ret)
 		goto fail;
 
-	for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
-					    new_crtc_state, i) {
-		if (!intel_crtc_needs_modeset(new_crtc_state)) {
-			if (intel_crtc_is_bigjoiner_slave(new_crtc_state))
-				copy_bigjoiner_crtc_state_nomodeset(state, crtc);
-			else
-				intel_crtc_copy_uapi_to_hw_state_nomodeset(state, crtc);
-			continue;
-		}
-
-		if (intel_crtc_is_bigjoiner_slave(new_crtc_state)) {
-			drm_WARN_ON(&dev_priv->drm, new_crtc_state->uapi.enable);
-			continue;
-		}
-
-		ret = intel_crtc_prepare_cleared_state(state, crtc);
-		if (ret)
-			goto fail;
-
-		if (!new_crtc_state->hw.enable)
-			continue;
-
-		ret = intel_modeset_pipe_config(state, crtc);
-		if (ret)
-			goto fail;
-
-		ret = intel_atomic_check_bigjoiner(state, crtc);
-		if (ret)
-			goto fail;
-	}
-
 	for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
 					    new_crtc_state, i) {
 		if (!intel_crtc_needs_modeset(new_crtc_state))