From: Charlene Liu <Charlene.Liu@amd.com>
Date: Thu, 5 Mar 2026 15:14:39 +0000 (-0500)
Subject: drm/amd/display: System Hang When System enters to S0i3 w/ iGPU
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=6c36d8b0c93f18c97d26f92d13945ddc56e4fd86;p=thirdparty%2Flinux.git

drm/amd/display: System Hang When System enters to S0i3 w/ iGPU

[why]
System Hang when system enters to S0i3 w/ iGPU
some link_enc are NULL due to BIOS integration info table not correct,
but driver should have enough null pointer protection.

Reviewed-by: Leo Chen <leo.chen@amd.com>
Signed-off-by: Charlene Liu <Charlene.Liu@amd.com>
Signed-off-by: Roman Li <roman.li@amd.com>
Signed-off-by: Chuanyu Tseng <Chuanyu.Tseng@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---

diff --git a/drivers/gpu/drm/amd/display/dc/hwss/dcn42/dcn42_hwseq.c b/drivers/gpu/drm/amd/display/dc/hwss/dcn42/dcn42_hwseq.c
index 8e12dc1297c4d..7bf94eae30a6f 100644
--- a/drivers/gpu/drm/amd/display/dc/hwss/dcn42/dcn42_hwseq.c
+++ b/drivers/gpu/drm/amd/display/dc/hwss/dcn42/dcn42_hwseq.c
@@ -203,7 +203,8 @@ void dcn42_init_hw(struct dc *dc)
 			for (i = 0; i < dc->link_count; i++) {
 				struct dc_link *link = dc->links[i];
 
-				if (link->link_enc->funcs->is_dig_enabled &&
+				if (link && link->link_enc &&
+					link->link_enc->funcs->is_dig_enabled &&
 						link->link_enc->funcs->is_dig_enabled(link->link_enc) &&
 						hws->funcs.power_down) {
 					hws->funcs.power_down(dc);