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-rw-r--r--drivers/serial/amba-pl010.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/serial/amba-pl010.c b/drivers/serial/amba-pl010.c
index 429a8ae86933..e4b3c2c88bb6 100644
--- a/drivers/serial/amba-pl010.c
+++ b/drivers/serial/amba-pl010.c
@@ -471,6 +471,20 @@ pl010_set_termios(struct uart_port *port, struct ktermios *termios,
spin_unlock_irqrestore(&uap->port.lock, flags);
}
+static void pl010_set_ldisc(struct uart_port *port)
+{
+ int line = port->line;
+
+ if (line >= port->state->port.tty->driver->num)
+ return;
+
+ if (port->state->port.tty->ldisc->ops->num == N_PPS) {
+ port->flags |= UPF_HARDPPS_CD;
+ pl010_enable_ms(port);
+ } else
+ port->flags &= ~UPF_HARDPPS_CD;
+}
+
static const char *pl010_type(struct uart_port *port)
{
return port->type == PORT_AMBA ? "AMBA" : NULL;
@@ -531,6 +545,7 @@ static struct uart_ops amba_pl010_pops = {
.startup = pl010_startup,
.shutdown = pl010_shutdown,
.set_termios = pl010_set_termios,
+ .set_ldisc = pl010_set_ldisc,
.type = pl010_type,
.release_port = pl010_release_port,
.request_port = pl010_request_port,