drm/i915/fdi: use -EAGAIN instead of local special return value

Using standard -EAGAIN should be perfectly fine instead of using a
special case value.
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210930093229.28598-1-jani.nikula@intel.com

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

@@ -7555,12 +7555,7 @@ intel_modeset_pipe_config(struct intel_atomic_state *state,
 	ret = intel_crtc_compute_config(to_intel_crtc(crtc), pipe_config);
 	if (ret == -EDEADLK)
 		return ret;
-	if (ret < 0) {
-		drm_dbg_kms(&i915->drm, "CRTC fixup failed\n");
-		return ret;
-	}
-
-	if (ret == I915_DISPLAY_CONFIG_RETRY) {
+	if (ret == -EAGAIN) {
 		if (drm_WARN(&i915->drm, !retry,
 			     "loop in pipe configuration computation\n"))
 			return -EINVAL;
@@ -7569,6 +7564,10 @@ intel_modeset_pipe_config(struct intel_atomic_state *state,
 		retry = false;
 		goto encoder_retry;
 	}
+	if (ret < 0) {
+		drm_dbg_kms(&i915->drm, "CRTC fixup failed\n");
+		return ret;
+	}
 
 	/* Dithering seems to not pass-through bits correctly when it should, so
 	 * only enable it on 6bpc panels and when its not a compliance

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

@@ -267,7 +267,7 @@ int ilk_fdi_compute_config(struct intel_crtc *crtc,
 	}
 
 	if (needs_recompute)
-		return I915_DISPLAY_CONFIG_RETRY;
+		return -EAGAIN;
 
 	return ret;
 }

drivers/gpu/drm/i915/display/intel_fdi.h

@@ -12,7 +12,6 @@ struct intel_crtc;
 struct intel_crtc_state;
 struct intel_encoder;
 
-#define I915_DISPLAY_CONFIG_RETRY 1
 int intel_fdi_link_freq(struct drm_i915_private *i915,
 			const struct intel_crtc_state *pipe_config);
 int ilk_fdi_compute_config(struct intel_crtc *intel_crtc,