drivers/tty/serial/cpm_uart.c

504

if (baud < HW_BUF_SPD_THRESHOLD || port->flags & UPF_LOW_LATENCY)

drivers/tty/serial/max310x.c

1382

s->p[i].port.flags = UPF_FIXED_TYPE | UPF_LOW_LATENCY;

drivers/tty/serial/meson_uart.c

762

port->flags = UPF_BOOT_AUTOCONF | UPF_LOW_LATENCY;

drivers/tty/serial/owl-uart.c

707

owl_port->port.flags = UPF_BOOT_AUTOCONF | UPF_IOREMAP | UPF_LOW_LATENCY;

drivers/tty/serial/pch_uart.c

1403

if (serinfo->flags & UPF_LOW_LATENCY) {

drivers/tty/serial/pch_uart.c

1407

serinfo->flags &= ~UPF_LOW_LATENCY;

drivers/tty/serial/rda-uart.c

755

UPF_LOW_LATENCY;

drivers/tty/serial/sc16is7xx.c

1474

port->flags = UPF_FIXED_TYPE | UPF_LOW_LATENCY;

include/linux/serial_core.h

550

#define UPF_USR_MASK ((__force upf_t) (UPF_SPD_MASK|UPF_LOW_LATENCY))