drm/amd/display: DP training to set properly SCRAMBLING_DISABLE (b6ef55cc) · Commits · 戴 / test

drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c

+27 −0

Original line number	Diff line number	Diff line
		@@ -220,6 +220,30 @@ static enum dpcd_training_patterns
		return dpcd_tr_pattern;
		}

		static uint8_t dc_dp_initialize_scrambling_data_symbols(
		struct dc_link *link,
		enum dc_dp_training_pattern pattern)
		{
		uint8_t disable_scrabled_data_symbols = 0;

		switch (pattern) {
		case DP_TRAINING_PATTERN_SEQUENCE_1:
		case DP_TRAINING_PATTERN_SEQUENCE_2:
		case DP_TRAINING_PATTERN_SEQUENCE_3:
		disable_scrabled_data_symbols = 1;
		break;
		case DP_TRAINING_PATTERN_SEQUENCE_4:
		disable_scrabled_data_symbols = 0;
		break;
		default:
		ASSERT(0);
		DC_LOG_HW_LINK_TRAINING("%s: Invalid HW Training pattern: %d\n",
		__func__, pattern);
		break;
		}
		return disable_scrabled_data_symbols;
		}

		static inline bool is_repeater(struct dc_link *link, uint32_t offset)
		{
		return (!link->is_lttpr_mode_transparent && offset != 0);
		@@ -252,6 +276,9 @@ static void dpcd_set_lt_pattern_and_lane_settings(
		dpcd_pattern.v1_4.TRAINING_PATTERN_SET =
		dc_dp_training_pattern_to_dpcd_training_pattern(link, pattern);

		dpcd_pattern.v1_4.SCRAMBLING_DISABLE =
		dc_dp_initialize_scrambling_data_symbols(link, pattern);

		dpcd_lt_buffer[DP_TRAINING_PATTERN_SET - DP_TRAINING_PATTERN_SET]
		= dpcd_pattern.raw;