From 42009e6f2ade8d8eeb4708067172e43edf2e8c18 Mon Sep 17 00:00:00 2001
From: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Date: Thu, 23 Jul 2026 14:12:39 -0400
Subject: [PATCH] drm/amd/display: Fix crash in DCN5/6 calcs when GPUVM enabled

[Why]
If vmpg_bytes is 0 and gpuvm is enabled then we divide by zero.

[How]
Take the same path as gpuvm disabled when vmpg_bytes is 0.

Reviewed-by: Dillon Varone <dillon.varone@amd.com>
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Signed-off-by: Tom Chung <chiahsuan.chung@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---
 .../dc/dml2_0/dml21/src/dml2_core/dml2_core_dcn5_calcs_dchub.c  | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dml2_0/dml21/src/dml2_core/dml2_core_dcn5_calcs_dchub.c b/drivers/gpu/drm/amd/display/dc/dml2_0/dml21/src/dml2_core/dml2_core_dcn5_calcs_dchub.c
index 38ccf9dab31f..bd2494c976ac 100644
--- a/drivers/gpu/drm/amd/display/dc/dml2_0/dml21/src/dml2_core/dml2_core_dcn5_calcs_dchub.c
+++ b/drivers/gpu/drm/amd/display/dc/dml2_0/dml21/src/dml2_core/dml2_core_dcn5_calcs_dchub.c
@@ -2419,7 +2419,7 @@ void dcn5_calculate_tdlut_setting(
 	else
 		tdlut_footprint_bytes = tdlut_pitch_bytes;
 
-	if (!p->gpuvm_enable) {
+	if (!p->gpuvm_enable || vmpg_bytes == 0) {
 		tdlut_vmpg_per_frame = 0;
 		tdlut_pte_req_per_frame = 0;
 	} else {