drm/i915/fbc: No FBC+double wide pipe

FBC and double wide pipe are mutually exclusive. Disable FBC when
we have to resort to double wide.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211124113652.22090-20-ville.syrjala@linux.intel.com
Reviewed-by: Mika Kahola <mika.kahola@intel.com>

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

@@ -1056,6 +1056,11 @@ static int intel_fbc_check_plane(struct intel_atomic_state *state,
 		return 0;
 	}
 
+	if (crtc_state->double_wide) {
+		plane_state->no_fbc_reason = "double wide pipe not supported";
+		return 0;
+	}
+
 	/*
 	 * Display 12+ is not supporting FBC with PSR2.
 	 * Recommendation is to keep this combination disabled