diff options
| -rw-r--r-- | drivers/tty/serial/8250/8250_port.c | 2 | ||||
| -rw-r--r-- | include/linux/serial_core.h | 1 |
2 files changed, 2 insertions, 1 deletions
diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c index 09a65a3ec7f7..d5b6cee87801 100644 --- a/drivers/tty/serial/8250/8250_port.c +++ b/drivers/tty/serial/8250/8250_port.c @@ -2229,7 +2229,7 @@ int serial8250_do_startup(struct uart_port *port) } } - if (port->irq) { + if (port->irq && !(up->port.flags & UPF_NO_THRE_TEST)) { unsigned char iir1; /* * Test for UARTs that do not reassert THRE when the diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h index 64d892f1e5cd..1775500294bb 100644 --- a/include/linux/serial_core.h +++ b/include/linux/serial_core.h @@ -195,6 +195,7 @@ struct uart_port { #define UPF_NO_TXEN_TEST ((__force upf_t) (1 << 15)) #define UPF_MAGIC_MULTIPLIER ((__force upf_t) ASYNC_MAGIC_MULTIPLIER /* 16 */ ) +#define UPF_NO_THRE_TEST ((__force upf_t) (1 << 19)) /* Port has hardware-assisted h/w flow control */ #define UPF_AUTO_CTS ((__force upf_t) (1 << 20)) #define UPF_AUTO_RTS ((__force upf_t) (1 << 21)) |