drm/amd/display: Get num_chans from VBIOS table

Get the values from VBIOS table

Signed-off-by: Alvin Lee <[e-mail]>
Signed-off-by: Bhawanpreet Lakha <[e-mail]>
Reviewed-by: Hersen Wu <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

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

···
 	return NULL;
 }
 
+static enum bp_result get_vram_info_v23(
+	struct bios_parser *bp,
+	struct dc_vram_info *info)
+{
+	struct atom_vram_info_header_v2_3 *info_v23;
+	enum bp_result result = BP_RESULT_OK;
+
+	info_v23 = GET_IMAGE(struct atom_vram_info_header_v2_3,
+						DATA_TABLES(vram_info));
+
+	if (info_v23 == NULL)
+		return BP_RESULT_BADBIOSTABLE;
+
+	info->num_chans = info_v23->vram_module[0].channel_num;
+	info->dram_channel_width_bytes = (1 << info_v23->vram_module[0].channel_width) / 8;
+
+	return result;
+}
+
+static enum bp_result get_vram_info_v24(
+	struct bios_parser *bp,
+	struct dc_vram_info *info)
+{
+	struct atom_vram_info_header_v2_4 *info_v24;
+	enum bp_result result = BP_RESULT_OK;
+
+	info_v24 = GET_IMAGE(struct atom_vram_info_header_v2_4,
+						DATA_TABLES(vram_info));
+
+	if (info_v24 == NULL)
+		return BP_RESULT_BADBIOSTABLE;
+
+	info->num_chans = info_v24->vram_module[0].channel_num;
+	info->dram_channel_width_bytes = (1 << info_v24->vram_module[0].channel_width) / 8;
+
+	return result;
+}
+
+static enum bp_result get_vram_info_v25(
+	struct bios_parser *bp,
+	struct dc_vram_info *info)
+{
+	struct atom_vram_info_header_v2_5 *info_v25;
+	enum bp_result result = BP_RESULT_OK;
+
+	info_v25 = GET_IMAGE(struct atom_vram_info_header_v2_5,
+						DATA_TABLES(vram_info));
+
+	if (info_v25 == NULL)
+		return BP_RESULT_BADBIOSTABLE;
+
+	info->num_chans = info_v25->vram_module[0].channel_num;
+	info->dram_channel_width_bytes = (1 << info_v25->vram_module[0].channel_width) / 8;
+
+	return result;
+}
+
 /*
  * get_integrated_info_v11
  *
···
 		}
 	}
 
+	return result;
+}
+
+static enum bp_result bios_parser_get_vram_info(
+		struct dc_bios *dcb,
+		struct dc_vram_info *info)
+{
+	struct bios_parser *bp = BP_FROM_DCB(dcb);
+	enum bp_result result = BP_RESULT_BADBIOSTABLE;
+	struct atom_common_table_header *header;
+	struct atom_data_revision revision;
+
+	if (info && DATA_TABLES(vram_info)) {
+		header = GET_IMAGE(struct atom_common_table_header,
+					DATA_TABLES(vram_info));
+
+		get_atom_data_table_revision(header, &revision);
+
+		switch (revision.major) {
+		case 2:
+			switch (revision.minor) {
+			case 3:
+				result = get_vram_info_v23(bp, info);
+				break;
+			case 4:
+				result = get_vram_info_v24(bp, info);
+				break;
+			case 5:
+				result = get_vram_info_v25(bp, info);
+				break;
+			default:
+				break;
+			}
+			break;
+
+		default:
+			return result;
+		}
+
+	}
 	return result;
 }
 
···
 
 	bp->base.integrated_info = bios_parser_create_integrated_info(&bp->base);
 	bp->base.fw_info_valid = bios_parser_get_firmware_info(&bp->base, &bp->base.fw_info) == BP_RESULT_OK;
+	bios_parser_get_vram_info(&bp->base, &bp->base.vram_info);
 
 	return true;
 }

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

···
 	struct integrated_info *integrated_info;
 	struct dc_firmware_info fw_info;
 	bool fw_info_valid;
+	struct dc_vram_info vram_info;
 };
 
 #endif /* DC_BIOS_TYPES_H */

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

···
 	.max_avg_dram_bw_use_normal_percent = 40.0,
 	.writeback_latency_us = 12.0,
 	.max_request_size_bytes = 256,
-	.dram_channel_width_bytes = 2,
 	.fabric_datapath_to_dcn_data_return_bytes = 64,
 	.dcn_downspread_percent = 0.5,
 	.downspread_percent = 0.38,
···
 static void dcn30_update_bw_bounding_box(struct dc *dc, struct clk_bw_params *bw_params)
 {
 	unsigned int i;
+
+	if (dc->ctx->dc_bios->vram_info.num_chans)
+		dcn3_0_soc.num_chans = dc->ctx->dc_bios->vram_info.num_chans;
+
+	if (dc->ctx->dc_bios->vram_info.dram_channel_width_bytes)
+		dcn3_0_soc.dram_channel_width_bytes = dc->ctx->dc_bios->vram_info.dram_channel_width_bytes;
 
 	dcn3_0_soc.dispclk_dppclk_vco_speed_mhz = dc->clk_mgr->dentist_vco_freq_khz / 1000.0;
 	dc->dml.soc.dispclk_dppclk_vco_speed_mhz = dc->clk_mgr->dentist_vco_freq_khz / 1000.0;

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

···
 
 };
 
+struct dc_vram_info {
+	unsigned int num_chans;
+	unsigned int dram_channel_width_bytes;
+};
+
 struct step_and_delay_info {
 	uint32_t step;
 	uint32_t delay;