From 6c36d8b0c93f18c97d26f92d13945ddc56e4fd86 Mon Sep 17 00:00:00 2001 From: Charlene Liu Date: Thu, 5 Mar 2026 10:14:39 -0500 Subject: [PATCH] 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 Signed-off-by: Charlene Liu Signed-off-by: Roman Li Signed-off-by: Chuanyu Tseng Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/display/dc/hwss/dcn42/dcn42_hwseq.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) 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 8e12dc1297c4..7bf94eae30a6 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);