drm/amd/display: get socBB from VBIOS

[why]
Some SOC BB paramters may vary per SKU, and it does
not make sense for driver to hardcode these values

[how]
Parse the values from VBIOS if available, and use
them if valid

Signed-off-by: Jun Lei <[e-mail]>
Acked-by: Aurabindo Pillai <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/display/dc/bios/bios_parser2.c

···
 	return result;
 }
 
+static enum bp_result get_soc_bb_info_v4_4(
+	struct bios_parser *bp,
+	struct bp_soc_bb_info *soc_bb_info)
+{
+	enum bp_result result = BP_RESULT_OK;
+	struct atom_display_controller_info_v4_4 *disp_cntl_tbl = NULL;
+
+	if (!soc_bb_info)
+		return BP_RESULT_BADINPUT;
+
+	if (!DATA_TABLES(dce_info))
+		return BP_RESULT_BADBIOSTABLE;
+
+	if (!DATA_TABLES(smu_info))
+		return BP_RESULT_BADBIOSTABLE;
+
+	disp_cntl_tbl =  GET_IMAGE(struct atom_display_controller_info_v4_4,
+							DATA_TABLES(dce_info));
+	if (!disp_cntl_tbl)
+		return BP_RESULT_BADBIOSTABLE;
+
+	soc_bb_info->dram_clock_change_latency_100ns = disp_cntl_tbl->max_mclk_chg_lat;
+	soc_bb_info->dram_sr_enter_exit_latency_100ns = disp_cntl_tbl->max_sr_enter_exit_lat;
+	soc_bb_info->dram_sr_exit_latency_100ns = disp_cntl_tbl->max_sr_exit_lat;
+
+	return result;
+}
+
+static enum bp_result bios_parser_get_soc_bb_info(
+	struct dc_bios *dcb,
+	struct bp_soc_bb_info *soc_bb_info)
+{
+	struct bios_parser *bp = BP_FROM_DCB(dcb);
+	enum bp_result result = BP_RESULT_UNSUPPORTED;
+	struct atom_common_table_header *header;
+	struct atom_data_revision tbl_revision;
+
+	if (!soc_bb_info) /* check for bad input */
+		return BP_RESULT_BADINPUT;
+
+	if (!DATA_TABLES(dce_info))
+		return BP_RESULT_UNSUPPORTED;
+
+	header = GET_IMAGE(struct atom_common_table_header,
+						DATA_TABLES(dce_info));
+	get_atom_data_table_revision(header, &tbl_revision);
+
+	switch (tbl_revision.major) {
+	case 4:
+		switch (tbl_revision.minor) {
+		case 1:
+		case 2:
+		case 3:
+			break;
+		case 4:
+			result = get_soc_bb_info_v4_4(bp, soc_bb_info);
+		default:
+			break;
+		}
+		break;
+	default:
+		break;
+	}
+
+	return result;
+}
+
 static enum bp_result get_embedded_panel_info_v2_1(
 		struct bios_parser *bp,
 		struct embedded_panel_info *info)
···
 
 	.get_atom_dc_golden_table = bios_get_atom_dc_golden_table,
 
-	.enable_lvtma_control = bios_parser_enable_lvtma_control
+	.enable_lvtma_control = bios_parser_enable_lvtma_control,
+
+	.get_soc_bb_info = bios_parser_get_soc_bb_info,
 };
 
 static bool bios_parser2_construct(

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

···
 	enum bp_result (*enable_lvtma_control)(
 		struct dc_bios *bios,
 		uint8_t uc_pwr_on);
+
+	enum bp_result (*get_soc_bb_info)(
+		struct dc_bios *dcb,
+		struct bp_soc_bb_info *soc_bb_info);
 };
 
 struct bios_registers {

drivers/gpu/drm/amd/display/dc/dcn30/dcn30_resource.c

···
 	loaded_ip->max_num_dpp = pool->base.pipe_count;
 	loaded_ip->clamp_min_dcfclk = dc->config.clamp_min_dcfclk;
 	dcn20_patch_bounding_box(dc, loaded_bb);
+
+	if (!bb && dc->ctx->dc_bios->funcs->get_soc_bb_info) {
+		struct bp_soc_bb_info bb_info = {0};
+
+		if (dc->ctx->dc_bios->funcs->get_soc_bb_info(dc->ctx->dc_bios, &bb_info) == BP_RESULT_OK) {
+			if (bb_info.dram_clock_change_latency_100ns > 0)
+				dcn3_0_soc.dram_clock_change_latency_us = bb_info.dram_clock_change_latency_100ns * 10;
+
+			if (bb_info.dram_sr_enter_exit_latency_100ns > 0)
+				dcn3_0_soc.sr_enter_plus_exit_time_us = bb_info.dram_sr_enter_exit_latency_100ns * 10;
+
+			if (bb_info.dram_sr_exit_latency_100ns > 0)
+				dcn3_0_soc.sr_exit_time_us = bb_info.dram_sr_exit_latency_100ns * 10;
+		}
+	}
+
 	return true;
 }
 

drivers/gpu/drm/amd/display/include/bios_parser_types.h

···
 	uint32_t RESERVED:27;
 };
 
+struct bp_soc_bb_info {
+	uint32_t dram_clock_change_latency_100ns;
+	uint32_t dram_sr_exit_latency_100ns;
+	uint32_t dram_sr_enter_exit_latency_100ns;
+};
+
 #endif /*__DAL_BIOS_PARSER_TYPES_H__ */