From: jsg <jsg@openbsd.org>
Date: Thu, 17 Aug 2023 03:45:49 +0000 (+0000)
Subject: drm/amd/display: limit DPIA link rate to HBR3
X-Git-Url: http://artulab.com/gitweb/?a=commitdiff_plain;h=f99f199754d2afbe3650ee200aa975fac025124c;p=openbsd

drm/amd/display: limit DPIA link rate to HBR3

From Peichen Huang
3d3fd58bfca151028859cc23757191fa2f65f679 in linux-6.1.y/6.1.46
0e69ef6ea82e8eece7d2b2b45a0da9670eaaefff in mainline linux
---

diff --git a/sys/dev/pci/drm/amd/display/dc/core/dc_link.c b/sys/dev/pci/drm/amd/display/dc/core/dc_link.c
index bba7e063530..8ea26f6e26e 100644
--- a/sys/dev/pci/drm/amd/display/dc/core/dc_link.c
+++ b/sys/dev/pci/drm/amd/display/dc/core/dc_link.c
@@ -1141,6 +1141,11 @@ static bool detect_link_and_local_sink(struct dc_link *link,
 					(link->dpcd_caps.dongle_type !=
 							DISPLAY_DONGLE_DP_HDMI_CONVERTER))
 				converter_disable_audio = true;
+
+			/* limited link rate to HBR3 for DPIA until we implement USB4 V2 */
+			if (link->ep_type == DISPLAY_ENDPOINT_USB4_DPIA &&
+					link->reported_link_cap.link_rate > LINK_RATE_HIGH3)
+				link->reported_link_cap.link_rate = LINK_RATE_HIGH3;
 			break;
 		}