From ff50c44a5fb4411715da828af5b8706c8a456d26 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Marek=20Ol=C5=A1=C3=A1k?= <marek.olsak@amd.com>
Date: Sat, 26 Nov 2016 15:43:39 +0100
Subject: [PATCH] radeonsi: set CB_BLEND1_CONTROL.ENABLE for dual source
 blending
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copied from Vulkan

Cc: 13.0 <mesa-stable@lists.freedesktop.org>
Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
---
 src/gallium/drivers/radeonsi/si_state.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/gallium/drivers/radeonsi/si_state.c b/src/gallium/drivers/radeonsi/si_state.c
index 47b1148b493..911e979a4fb 100644
--- a/src/gallium/drivers/radeonsi/si_state.c
+++ b/src/gallium/drivers/radeonsi/si_state.c
@@ -454,6 +454,10 @@ static void *si_create_blend_state_mode(struct pipe_context *ctx,
 
 		/* Only set dual source blending for MRT0 to avoid a hang. */
 		if (i >= 1 && blend->dual_src_blend) {
+			/* Vulkan does this for dual source blending. */
+			if (i == 1)
+				blend_cntl |= S_028780_ENABLE(1);
+
 			si_pm4_set_reg(pm4, R_028780_CB_BLEND0_CONTROL + i * 4, blend_cntl);
 			continue;
 		}
-- 
2.30.2