From 981f1d88a18b552b5fbb2c524016dfdc481b8e46 Mon Sep 17 00:00:00 2001
From: Danylo Piliaiev <dpiliaiev@igalia.com>
Date: Fri, 3 Feb 2023 17:02:52 +0100
Subject: [PATCH] tu: Prevent using stale value of RB_UNKNOWN_88D0 on BLIT

Fixes: def56b531c86f529bc32d1834ccb479457717db7
("tu: Support GMEM with layered rendering and multiview")

Signed-off-by: Danylo Piliaiev <dpiliaiev@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/21148>
---
 src/freedreno/vulkan/tu_clear_blit.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/freedreno/vulkan/tu_clear_blit.c b/src/freedreno/vulkan/tu_clear_blit.c
index c6c0550ebfe..23370f2f3d5 100644
--- a/src/freedreno/vulkan/tu_clear_blit.c
+++ b/src/freedreno/vulkan/tu_clear_blit.c
@@ -3076,6 +3076,9 @@ tu_emit_blit(struct tu_cmd_buffer *cmd,
                         A6XX_RB_BLIT_BASE_GMEM(tu_attachment_gmem_offset(cmd, attachment, i)));
       }
 
+      tu_cs_emit_pkt4(cs, REG_A6XX_RB_UNKNOWN_88D0, 1);
+      tu_cs_emit(cs, 0);
+
       tu6_emit_event_write(cmd, cs, BLIT);
    }
 }