From 2ba8ead47609ab2a3c7a4d0633265234ab2a3187 Mon Sep 17 00:00:00 2001
From: Michael Strauss <michael.strauss@amd.com>
Date: Wed, 17 Aug 2022 10:57:10 -0400
Subject: drm/amd/display: Add DC debug option to force LTTPR mode
Git-commit: 280f1884892f3825d2060df43dd1d452c585cd0e
Patch-mainline: v6.1-rc1
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225 jsc#PED-2849
[WHY]
Useful for external teams debugging LTTPR issues
Reviewed-by: George Shen <George.Shen@amd.com>
Acked-by: Brian Chang <Brian.Chang@amd.com>
Signed-off-by: Michael Strauss <michael.strauss@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c | 4 ++++
drivers/gpu/drm/amd/display/dc/dc.h | 1 +
2 files changed, 5 insertions(+)
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
index ec9570f5a7f4..6c05e738d2d8 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
@@ -5038,6 +5038,10 @@ static void determine_lttpr_mode(struct dc_link *link)
bool vbios_lttpr_enable = link->dc->caps.vbios_lttpr_enable;
bool vbios_lttpr_interop = link->dc->caps.vbios_lttpr_aware;
+ if (link->ctx->dc->debug.lttpr_mode_override != 0) {
+ link->lttpr_mode = link->ctx->dc->debug.lttpr_mode_override;
+ return;
+ }
if ((link->dc->config.allow_lttpr_non_transparent_mode.bits.DP2_0 &&
link->dpcd_caps.channel_coding_cap.bits.DP_128b_132b_SUPPORTED)) {
diff --git a/drivers/gpu/drm/amd/display/dc/dc.h b/drivers/gpu/drm/amd/display/dc/dc.h
index 1b675321d9b2..374a74dc8e66 100644
--- a/drivers/gpu/drm/amd/display/dc/dc.h
+++ b/drivers/gpu/drm/amd/display/dc/dc.h
@@ -847,6 +847,7 @@ struct dc_debug_options {
bool exit_idle_opt_for_cursor_updates;
bool enable_single_display_2to1_odm_policy;
bool enable_dp_dig_pixel_rate_div_policy;
+ enum lttpr_mode lttpr_mode_override;
};
struct gpu_info_soc_bounding_box_v1_0;
--
2.38.1