drm/amd/display: Support parsing VRAM info v3.0 from VBIOS

[Why]
For DCN3.2 and DCN3.21, VBIOS has switch to using v3.0 of the VRAM
info struct. We should read and override the VRAM info in driver with
values provided by VBIOS to support memory downbin cases.

Reviewed-by: Alvin Lee <Alvin.Lee2@amd.com>
Acked-by: Tom Chung <chiahsuan.chung@amd.com>
Signed-off-by: George Shen <george.shen@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -2393,6 +2393,26 @@ static enum bp_result get_vram_info_v25(
 	return result;
 }
 
+static enum bp_result get_vram_info_v30(
+	struct bios_parser *bp,
+	struct dc_vram_info *info)
+{
+	struct atom_vram_info_header_v3_0 *info_v30;
+	enum bp_result result = BP_RESULT_OK;
+
+	info_v30 = GET_IMAGE(struct atom_vram_info_header_v3_0,
+						DATA_TABLES(vram_info));
+
+	if (info_v30 == NULL)
+		return BP_RESULT_BADBIOSTABLE;
+
+	info->num_chans = info_v30->channel_num;
+	info->dram_channel_width_bytes = (1 << info_v30->channel_width) / 8;
+
+	return result;
+}
+
+
 /*
  * get_integrated_info_v11
  *
@@ -3060,6 +3080,16 @@ static enum bp_result bios_parser_get_vram_info(
 			}
 			break;
 
+		case 3:
+			switch (revision.minor) {
+			case 0:
+				result = get_vram_info_v30(bp, info);
+				break;
+			default:
+				break;
+			}
+			break;
+
 		default:
 			return result;
 		}