intel/fs: Work around dual-source blending hangs in combination with SIMD16

[mesa.git] / src / intel / compiler / brw_fs_visitor.cpp

diff --git a/src/intel/compiler/brw_fs_visitor.cpp b/src/intel/compiler/brw_fs_visitor.cpp
index 7b315693e4acf1b68f64a474f3b694b5f8d04ed8..22e83f1adb92dea2db61a06c459102c56dff501d 100644 (file)
--- a/src/intel/compiler/brw_fs_visitor.cpp
+++ b/src/intel/compiler/brw_fs_visitor.cpp
@@ -548,9 +548,13 @@ fs_visitor::emit_fb_writes()
        * XXX - Emit an extra single-source NULL RT-write marked LastRT in
        *       order to release the thread dependency without disabling
        *       SIMD32.
+       *
+       * The dual-source RT write messages may lead to hangs with SIMD16
+       * dispatch on ICL due some unknown reasons, see
+       * https://gitlab.freedesktop.org/mesa/mesa/-/issues/2183
        */
-      limit_dispatch_width(16, "Dual source blending unsupported "
-                           "in SIMD32 mode.\n");
+      limit_dispatch_width(8, "Dual source blending unsupported "
+                           "in SIMD16 and SIMD32 modes.\n");
    }
 }