From 6775524c69c660a4585e3e5ed85f4d7b9129054f Mon Sep 17 00:00:00 2001
From: Lucas Stach <l.stach@pengutronix.de>
Date: Fri, 25 Oct 2024 15:48:51 +0200
Subject: [PATCH] etnaviv: set PE_COLOR_FORMAT_OVERWRITE when no color target
 is active

When no color target is bound PE_COLOR_FORMAT_OVERWRITE must be set to
avoid GPU hangs.

Fixes: 07cd0f230628 ("etnaviv: blend: Add support for MRTs")
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Reviewed-by: Christian Gmeiner <cgmeiner@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/31845>
---
 src/gallium/drivers/etnaviv/etnaviv_blend.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/gallium/drivers/etnaviv/etnaviv_blend.c b/src/gallium/drivers/etnaviv/etnaviv_blend.c
index f61e2ccc444..8d8dba15ecf 100644
--- a/src/gallium/drivers/etnaviv/etnaviv_blend.c
+++ b/src/gallium/drivers/etnaviv/etnaviv_blend.c
@@ -178,6 +178,9 @@ etna_update_blend(struct etna_context *ctx)
       current_rt++;
    }
 
+   if (current_rt == 0)
+      blend->rt[0].PE_COLOR_FORMAT = VIVS_PE_COLOR_FORMAT_OVERWRITE;
+
    return true;
 }