From: jsg <jsg@openbsd.org>
Date: Fri, 2 Feb 2024 03:27:33 +0000 (+0000)
Subject: drm/amd/display: Align the returned error code with legacy DP
X-Git-Url: http://artulab.com/gitweb/?a=commitdiff_plain;h=6936bf9fbeb207d8e0903b06e632fa0dc9bc5653;p=openbsd

drm/amd/display: Align the returned error code with legacy DP

From Wayne Lin
d3af41be094a39e1a1392d1d42cdf3eb90922476 in linux-6.6.y/6.6.15
bfe79f5fff1300d96203383582b078c7b0aec80a in mainline linux
---

diff --git a/sys/dev/pci/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c b/sys/dev/pci/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
index cb0142f3a4d..f50a0d689cc 100644
--- a/sys/dev/pci/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
+++ b/sys/dev/pci/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
@@ -956,6 +956,11 @@ int dm_helper_dmub_aux_transfer_sync(
 		struct aux_payload *payload,
 		enum aux_return_code_type *operation_result)
 {
+	if (!link->hpd_status) {
+		*operation_result = AUX_RET_ERROR_HPD_DISCON;
+		return -1;
+	}
+
 	return amdgpu_dm_process_dmub_aux_transfer_sync(ctx, link->link_index, payload,
 			operation_result);
 }