drm/amd/display: Add link rate optimization logs for ILR

[Why&How]
Add logs to verify ILR optimization behaviour on boot

Signed-off-by: Michael Strauss <[e-mail]>
Reviewed-by: Nicholas Kazlauskas <[e-mail]>
Acked-by: Aurabindo Pillai <[e-mail]>
Tested-by: Daniel Wheeler <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

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

···
 	}
 
 	if (is_edp_ilr_optimization_required(link, crtc_timing)) {
+		DC_LOG_EVENT_LINK_TRAINING("Seamless boot disabled to optimize eDP link rate\n");
 		return false;
 	}
 

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

···
 	core_link_read_dpcd(link, DP_LINK_BW_SET,
 				&link_bw_set, sizeof(link_bw_set));
 
-	if (link_bw_set)
+	if (link_bw_set) {
+		DC_LOG_EVENT_LINK_TRAINING("eDP ILR: Optimization required, VBIOS used link_bw_set\n");
 		return true;
+	}
 
 	// Read DPCD 00115h to find the edp link rate set used
 	core_link_read_dpcd(link, DP_LINK_RATE_SET,
···
 	decide_edp_link_settings(link, &link_setting, req_bw);
 
 	if (link->dpcd_caps.edp_supported_link_rates[link_rate_set] != link_setting.link_rate ||
-			lane_count_set.bits.LANE_COUNT_SET != link_setting.lane_count)
+			lane_count_set.bits.LANE_COUNT_SET != link_setting.lane_count) {
+		DC_LOG_EVENT_LINK_TRAINING("eDP ILR: Optimization required, VBIOS link_rate_set not optimal\n");
 		return true;
+	}
 
+	DC_LOG_EVENT_LINK_TRAINING("eDP ILR: No optimization required, VBIOS set optimal link_rate_set\n");
 	return false;
 }
 

drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c

···
 	bool can_apply_edp_fast_boot = false;
 	bool can_apply_seamless_boot = false;
 	bool keep_edp_vdd_on = false;
+	DC_LOGGER_INIT();
+
 
 	get_edp_links_with_sink(dc, edp_links_with_sink, &edp_with_sink_num);
 	get_edp_links(dc, edp_links, &edp_num);
···
 					edp_stream = edp_streams[0];
 					can_apply_edp_fast_boot = !is_edp_ilr_optimization_required(edp_stream->link, &edp_stream->timing);
 					edp_stream->apply_edp_fast_boot_optimization = can_apply_edp_fast_boot;
+					if (can_apply_edp_fast_boot)
+						DC_LOG_EVENT_LINK_TRAINING("eDP fast boot disabled to optimize link rate\n");
 
 					break;
 				}