ATA_DNXFER_FORCE_PIO 3452 drivers/ata/libata-core.c 	case ATA_DNXFER_FORCE_PIO:
ATA_DNXFER_FORCE_PIO 2050 drivers/ata/libata-eh.c 		if (ata_down_xfermask_limit(dev, ATA_DNXFER_FORCE_PIO) == 0) {