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serial: Introduce UPSTAT_SYNC_FIFO for synchronised FIFOs 

This change adds a flag to indicate that a UART is has an external means
of synchronising its FIFO, without needing CTSRTS or XON/XOFF.

This allows us to use the throttle/unthrottle callbacks, without having
to claim other methods of flow control.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Tested-by: Eddie James <eajames@linux.vnet.ibm.com>
Tested-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jeremy Kerr 2018-03-27 11:48:24 +08:00 committed by Greg Kroah-Hartman
parent d6810a82c7
commit c5f78b1fe4
2 changed files with 3 additions and 2 deletions
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4
drivers/tty/serial/serial_core.c
View File

@ -674,8 +674,8 @@ static void uart_send_xchar(struct tty_struct *tty, char ch)
static void uart_throttle(struct tty_struct *tty)
{
struct uart_state *state = tty->driver_data;
upstat_t mask = UPSTAT_SYNC_FIFO;
struct uart_port *port;
upstat_t mask = 0;
port = uart_port_ref(state);
if (!port)
@ -703,8 +703,8 @@ static void uart_throttle(struct tty_struct *tty)
static void uart_unthrottle(struct tty_struct *tty)
{
struct uart_state *state = tty->driver_data;
upstat_t mask = UPSTAT_SYNC_FIFO;
struct uart_port *port;
upstat_t mask = 0;
port = uart_port_ref(state);
if (!port)

1
include/linux/serial_core.h
View File

@ -233,6 +233,7 @@ struct uart_port {
#define UPSTAT_AUTORTS ((__force upstat_t) (1 << 2))
#define UPSTAT_AUTOCTS ((__force upstat_t) (1 << 3))
#define UPSTAT_AUTOXOFF ((__force upstat_t) (1 << 4))
#define UPSTAT_SYNC_FIFO ((__force upstat_t) (1 << 5))
int hw_stopped; /* sw-assisted CTS flow state */
unsigned int mctrl; /* current modem ctrl settings */