From 55b852069d02e406fa493cc9366c523eb9b5d0a9 Mon Sep 17 00:00:00 2001
From: Alex Deucher <alexander.deucher@amd.com>
Date: Thu, 8 Aug 2019 00:48:58 -0500
Subject: drm/amdgpu/powerplay/vega10: enable mclk switching if monitors are
 synced
Git-commit: 55b852069d02e406fa493cc9366c523eb9b5d0a9
Patch-mainline: v5.4-rc1
References: bsc#1152489

If DC has synced the displays, we can enable mclk switching to
save power.

Reviewed-by: Evan Quan <evan.quan@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
---
 drivers/gpu/drm/amd/powerplay/hwmgr/vega10_hwmgr.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/powerplay/hwmgr/vega10_hwmgr.c b/drivers/gpu/drm/amd/powerplay/hwmgr/vega10_hwmgr.c
index 948c54cb9c5d..d08493b67b67 100644
--- a/drivers/gpu/drm/amd/powerplay/hwmgr/vega10_hwmgr.c
+++ b/drivers/gpu/drm/amd/powerplay/hwmgr/vega10_hwmgr.c
@@ -3220,7 +3220,8 @@ static int vega10_apply_state_adjust_rules(struct pp_hwmgr *hwmgr,
 	if (hwmgr->display_config->num_display == 0)
 		disable_mclk_switching = false;
 	else
-		disable_mclk_switching = (hwmgr->display_config->num_display > 1) ||
+		disable_mclk_switching = ((1 < hwmgr->display_config->num_display) &&
+					  !hwmgr->display_config->multi_monitor_in_sync) ||
 			disable_mclk_switching_for_frame_lock ||
 			disable_mclk_switching_for_vr ||
 			force_mclk_high;
-- 
2.28.0