[PATCH 10/14] drm/amd/display: add workaround flag to link to force FFE preset

[Aurabindo Pillai]

From: Brendan Tam <Brendan.Tam at amd.com>

[Why]
There have been instances of some monitors being unable to link train on
their reported link speed using their selected FFE preset. If a different
FFE preset is found that has a higher rate of success during link training
this workaround can be used to force its FFE preset.

[How]
A new link workaround flag is made called force_dp_ffe_preset. The flag is
checked in override_training_settings and will set lt_settings->ffe_preset
which is null if the flag is not set. The flag is then set in
override_lane_settings.

Reviewed-by: Wenjing Liu <wenjing.liu at amd.com>
Signed-off-by: Brendan Tam <Brendan.Tam at amd.com>
Signed-off-by: Aurabindo Pillai <aurabindo.pillai at amd.com>
---
 drivers/gpu/drm/amd/display/dc/dc.h                             | 2 ++
 .../gpu/drm/amd/display/dc/link/protocols/link_dp_training.c    | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/dc/dc.h b/drivers/gpu/drm/amd/display/dc/dc.h
index e1f4f643c364..16cd7833e931 100644
--- a/drivers/gpu/drm/amd/display/dc/dc.h
+++ b/drivers/gpu/drm/amd/display/dc/dc.h
@@ -1792,7 +1792,9 @@ struct dc_link {
 		bool dongle_mode_timing_override;
 		bool blank_stream_on_ocs_change;
 		bool read_dpcd204h_on_irq_hpd;
+		bool force_dp_ffe_preset;
 	} wa_flags;
+	union dc_dp_ffe_preset forced_dp_ffe_preset;
 	struct link_mst_stream_allocation_table mst_stream_alloc_table;
 
 	struct dc_link_status link_status;
diff --git a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_training.c b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_training.c
index 88d4288cde0f..751c18e592ea 100644
--- a/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_training.c
+++ b/drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_training.c
@@ -736,6 +736,8 @@ void override_training_settings(
 		lt_settings->pre_emphasis = overrides->pre_emphasis;
 	if (overrides->post_cursor2 != NULL)
 		lt_settings->post_cursor2 = overrides->post_cursor2;
+	if (link->wa_flags.force_dp_ffe_preset && !dp_is_lttpr_present(link))
+		lt_settings->ffe_preset = &link->forced_dp_ffe_preset;
 	if (overrides->ffe_preset != NULL)
 		lt_settings->ffe_preset = overrides->ffe_preset;
 	/* Override HW lane settings with BIOS forced values if present */
-- 
2.48.1