From d1fd30e511a70911151dc9f71c705e1fab175cef Mon Sep 17 00:00:00 2001
From: Charlene Liu <Charlene.Liu@amd.com>
Date: Tue, 22 Oct 2024 18:42:56 -0400
Subject: [PATCH] drm/amd/display: avoid divided by zero

[why]
insert divided by zero protection

Reviewed-by: Alvin Lee <alvin.lee2@amd.com>
Signed-off-by: Charlene Liu <Charlene.Liu@amd.com>
Signed-off-by: Zaeem Mohamed <zaeem.mohamed@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---
 drivers/gpu/drm/amd/display/modules/freesync/freesync.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/modules/freesync/freesync.c b/drivers/gpu/drm/amd/display/modules/freesync/freesync.c
index fc4268729017..f980a84dceef 100644
--- a/drivers/gpu/drm/amd/display/modules/freesync/freesync.c
+++ b/drivers/gpu/drm/amd/display/modules/freesync/freesync.c
@@ -129,6 +129,9 @@ unsigned int mod_freesync_calc_v_total_from_refresh(
 	unsigned int v_total;
 	unsigned int frame_duration_in_ns;
 
+	if (refresh_in_uhz == 0)
+		return stream->timing.v_total;
+
 	frame_duration_in_ns =
 			((unsigned int)(div64_u64((1000000000ULL * 1000000),
 					refresh_in_uhz)));
-- 
2.20.1