drm/amd/display: Remove Legacy FIXED_VS Transparent LT Sequence

The New sequence has been in use in DCN314 with no regressions
introduced. Therefore, it is safe to enable this sequence for all
devices using FIXED_VS retimers. So, remove the legacy codepath and its
associated config flag.
Reviewed-by: Ovidiu Bunea <ovidiu.bunea@amd.com>
Acked-by: Hamza Mahfooz <hamza.mahfooz@amd.com>
Signed-off-by: Michael Strauss <michael.strauss@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dc.h

@@ -429,7 +429,6 @@ struct dc_config {
 	bool force_bios_enable_lttpr;
 	uint8_t force_bios_fixed_vs;
 	int sdpif_request_limit_words_per_umc;
-	bool use_old_fixed_vs_sequence;
 	bool dc_mode_clk_limit_support;
 	bool EnableMinDispClkODM;
 	bool enable_auto_dpm_test_logs;

drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_training.c

@@ -1505,10 +1505,7 @@ enum link_training_result dp_perform_link_training(
 	 * Non-LT AUX transactions inside training mode.
 	 */
 	if ((link->chip_caps & EXT_DISPLAY_PATH_CAPS__DP_FIXED_VS_EN) && encoding == DP_8b_10b_ENCODING)
-		if (link->dc->config.use_old_fixed_vs_sequence)
-			status = dp_perform_fixed_vs_pe_training_sequence_legacy(link, link_res, &lt_settings);
-		else
-			status = dp_perform_fixed_vs_pe_training_sequence(link, link_res, &lt_settings);
+		status = dp_perform_fixed_vs_pe_training_sequence(link, link_res, &lt_settings);
 	else if (encoding == DP_8b_10b_ENCODING)
 		status = dp_perform_8b_10b_link_training(link, link_res, &lt_settings);
 	else if (encoding == DP_128b_132b_ENCODING)

drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_training_fixed_vs_pe_retimer.h

@@ -28,11 +28,6 @@
 #define __DC_LINK_DP_FIXED_VS_PE_RETIMER_H__
 #include "link_dp_training.h"
 
-enum link_training_result dp_perform_fixed_vs_pe_training_sequence_legacy(
-	struct dc_link *link,
-	const struct link_resource *link_res,
-	struct link_training_settings *lt_settings);
-
 enum link_training_result dp_perform_fixed_vs_pe_training_sequence(
 	struct dc_link *link,
 	const struct link_resource *link_res,

drivers/gpu/drm/amd/display/dc/resource/dcn31/dcn31_resource.c

@@ -1941,8 +1941,6 @@ static bool dcn31_resource_construct(
 	dc->caps.color.mpc.ogam_rom_caps.hlg = 0;
 	dc->caps.color.mpc.ocsc = 1;
 
-	dc->config.use_old_fixed_vs_sequence = true;
-
 	/* Use pipe context based otg sync logic */
 	dc->config.use_pipe_ctx_sync_logic = true;