FAILED: patch "[PATCH] drm/amd/display: force toggle rate wa for first link training" failed to apply to 6.1-stable tree

The patch below does not apply to the 6.1-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.1.y
git checkout FETCH_HEAD
git cherry-pick -x eb28018943fed7639dfea1c9ec9c756ec692b99a
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '2023120351-bottle-thong-2f53@gregkh' --subject-prefix 'PATCH 6.1.y' HEAD^..

Possible dependencies:

eb28018943fe ("drm/amd/display: force toggle rate wa for first link training for a retimer") 7727e7b60f82 ("drm/amd/display: Improve robustness of FIXED_VS link training at DP1 rates") 80c6d6804f31 ("drm/amd/display: disable SubVP + DRR to prevent underflow") 54618888d1ea ("drm/amd/display: break down dc_link.c")
71d7e8904d54 ("drm/amd/display: Add HDMI manufacturer OUI and device id read") 65a4cfb45e0e ("drm/amdgpu/display: remove duplicate include header in files") e322843e5e33 ("drm/amd/display: fix linux dp link lost handled only one time") 0c2bfcc338eb ("drm/amd/display: Add Function declaration in dc_link")
6ca7415f11af ("drm/amd/display: merge dc_link_dp into dc_link")
de3fb390175b ("drm/amd/display: move dp cts functions from dc_link_dp to link_dp_cts") c5a31f178e35 ("drm/amd/display: move dp irq handler functions from dc_link_dp to link_dp_irq_handler") 0078c924e733 ("drm/amd/display: move eDP panel control logic to link_edp_panel_control") bc33f5e5f05b ("drm/amd/display: create accessories, hwss and protocols sub folders in link") 2daeb74b7d66 ("drm/amdgpu/display/mst: update mst_mgr relevant variable when long HPD") 028c4ccfb812 ("drm/amd/display: force connector state when bpc changes during compliance") 603a521ec279 ("drm/amd/display: remove duplicate included header files")
bd3149014dff ("drm/amd/display: Decrease messaging about DP alt mode state to debug") d5a43956b73b ("drm/amd/display: move dp capability related logic to link_dp_capability") 94dfeaa46925 ("drm/amd/display: move dp phy related logic to link_dp_phy") 630168a97314 ("drm/amd/display: move dp link training logic to link_dp_training")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From eb28018943fed7639dfea1c9ec9c756ec692b99a Mon Sep 17 00:00:00 2001
From: Zhongwei <[email protected]>
Date: Wed, 8 Nov 2023 16:34:36 +0800
Subject: [PATCH] drm/amd/display: force toggle rate wa for first link training
for a retimer

[WHY]
Handover from DMUB to driver does not perform link rate toggle. It might cause link training failure for boot up.

[HOW]
Force toggle rate wa for first link train. link->vendor_specific_lttpr_link_rate_wa should be zero then.

index fd8f6f198146..68096d12f52f 100644
@@ -115,7 +115,7 @@ static enum link_training_result perform_fixed_vs_pe_nontransparent_training_seq
 		lt_settings->cr_pattern_time = 16000;
 
 	/* Fixed VS/PE specific: Toggle link rate */
-	apply_toggle_rate_wa = (link->vendor_specific_lttpr_link_rate_wa == target_rate);
+	apply_toggle_rate_wa = ((link->vendor_specific_lttpr_link_rate_wa == target_rate) || (link->vendor_specific_lttpr_link_rate_wa == 0));
 	target_rate = get_dpcd_link_rate(&lt_settings->link_settings);
 	toggle_rate = (target_rate == 0x6) ? 0xA : 0x6;
 

@@ -271,7 +271,7 @@ enum link_training_result dp_perform_fixed_vs_pe_training_sequence_legacy(
 	/* Vendor specific: Toggle link rate */
 	toggle_rate = (rate == 0x6) ? 0xA : 0x6;
 
-	if (link->vendor_specific_lttpr_link_rate_wa == rate) {
+	if (link->vendor_specific_lttpr_link_rate_wa == rate || link->vendor_specific_lttpr_link_rate_wa == 0) {
 		core_link_write_dpcd(
 				link,
 				DP_LINK_BW_SET,

@@ -617,7 +617,7 @@ enum link_training_result dp_perform_fixed_vs_pe_training_sequence(
 	/* Vendor specific: Toggle link rate */
 	toggle_rate = (rate == 0x6) ? 0xA : 0x6;
 
-	if (link->vendor_specific_lttpr_link_rate_wa == rate) {
+	if (link->vendor_specific_lttpr_link_rate_wa == rate || link->vendor_specific_lttpr_link_rate_wa == 0) {
 		core_link_write_dpcd(
 				link,
 				DP_LINK_BW_SET,