From: Tony Cheng <tony.cheng@amd.com>
Date: Wed, 11 Jul 2018 15:31:24 -0400
Subject: drm/amd/display: allow diags to skip initial link training
Git-commit: aafded888514ba2c6b613548081dedf289a71287
Patch-mainline: v4.19-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

[why]
diag specify what the full config and is only concerned about pass/fail at the end

having inter-op code like verifiying we can actually train at reported link rate
slows down diag test and add complexity we don't need

[how]
add dc_debug option to skip capability link trianing

also  remove hbr in function name as verify is not specific to hbr

Signed-off-by: Tony Cheng <tony.cheng@amd.com>
Reviewed-by: Ken Chalmers <ken.chalmers@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/amd/display/dc/core/dc_link.c    |    2 +-
 drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c |    7 ++++++-
 drivers/gpu/drm/amd/display/dc/dc.h              |    1 +
 drivers/gpu/drm/amd/display/dc/inc/dc_link_dp.h  |    2 +-
 4 files changed, 9 insertions(+), 3 deletions(-)

--- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
@@ -760,7 +760,7 @@ bool dc_link_detect(struct dc_link *link
 				 */
 
 				/* deal with non-mst cases */
-				dp_hbr_verify_link_cap(link, &link->reported_link_cap);
+				dp_verify_link_cap(link, &link->reported_link_cap);
 			}
 
 			/* HDMI-DVI Dongle */
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
@@ -1086,7 +1086,7 @@ static struct dc_link_settings get_max_l
 	return max_link_cap;
 }
 
-bool dp_hbr_verify_link_cap(
+bool dp_verify_link_cap(
 	struct dc_link *link,
 	struct dc_link_settings *known_limit_link_setting)
 {
@@ -1101,6 +1101,11 @@ bool dp_hbr_verify_link_cap(
 	enum clock_source_id dp_cs_id = CLOCK_SOURCE_ID_EXTERNAL;
 	enum link_training_result status;
 
+	if (link->dc->debug.skip_detection_link_training) {
+		link->verified_link_cap = *known_limit_link_setting;
+		return true;
+	}
+
 	success = false;
 	skip_link_training = false;
 
--- a/drivers/gpu/drm/amd/display/dc/dc.h
+++ b/drivers/gpu/drm/amd/display/dc/dc.h
@@ -259,6 +259,7 @@ struct dc_debug {
 	bool avoid_vbios_exec_table;
 	bool scl_reset_length10;
 	bool hdmi20_disable;
+	bool skip_detection_link_training;
 
 	struct {
 		uint32_t ltFailCount;
--- a/drivers/gpu/drm/amd/display/dc/inc/dc_link_dp.h
+++ b/drivers/gpu/drm/amd/display/dc/inc/dc_link_dp.h
@@ -33,7 +33,7 @@ struct dc_link;
 struct dc_stream_state;
 struct dc_link_settings;
 
-bool dp_hbr_verify_link_cap(
+bool dp_verify_link_cap(
 	struct dc_link *link,
 	struct dc_link_settings *known_limit_link_setting);