serial_core: Add wake_peer uart operation
Add wake_peer which is called before starting UART TX. The idea here
is to provide a mechanism where we can wakeup our peer before sending
data.
Change-Id: I42e0779b635f64ca99184b45d5b028de80197491
Signed-off-by: San Mehat <san@google.com>
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index 9c4c05b..7d9fbb8 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -94,6 +94,9 @@
struct uart_state *state = tty->driver_data;
struct uart_port *port = state->uart_port;
+ if (port->ops->wake_peer)
+ port->ops->wake_peer(port);
+
if (!uart_circ_empty(&state->xmit) && state->xmit.buf &&
!tty->stopped && !tty->hw_stopped)
port->ops->start_tx(port);
diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index f51bf2e..046d895 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -252,6 +252,7 @@
void (*pm)(struct uart_port *, unsigned int state,
unsigned int oldstate);
int (*set_wake)(struct uart_port *, unsigned int state);
+ void (*wake_peer)(struct uart_port *);
/*
* Return a string describing the type of the port