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greybus: uart: Add runtime pm support 

This adds runtime pm support for the uart driver.

Testing Done: Using the test daughter board, let
the gpb bridge enter standby and do a uart transfer
operation.

Signed-off-by: Axel Haslam <haslam_axel@projectara.com>
Signed-off-by: David Lin <dtwlin@google.com>
Reviewed-by: Johan Hovold <johan@hovoldconsulting.com>
Signed-off-by: Alex Elder <elder@linaro.org>
This commit is contained in:
Axel Haslam 2016-07-14 15:13:00 -05:00 committed by Alex Elder
parent c0e72f6af7
commit 22b8708725
1 changed files with 19 additions and 0 deletions
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19
drivers/staging/greybus/uart.c
View File

@ -771,6 +771,16 @@ static void gb_tty_dtr_rts(struct tty_port *port, int on)
send_control(gb_tty, newctrl);
}
static int gb_tty_port_activate(struct tty_port *port,
struct tty_struct *tty)
{
struct gb_tty *gb_tty;
gb_tty = container_of(port, struct gb_tty, port);
return gbphy_runtime_get_sync(gb_tty->gbphy_dev);
}
static void gb_tty_port_shutdown(struct tty_port *port)
{
struct gb_tty *gb_tty;
@ -800,6 +810,8 @@ static void gb_tty_port_shutdown(struct tty_port *port)
out:
gb_tty->close_pending = false;
gbphy_runtime_put_autosuspend(gb_tty->gbphy_dev);
}
static const struct tty_operations gb_ops = {
@ -822,6 +834,7 @@ static const struct tty_operations gb_ops = {
static struct tty_port_operations gb_port_ops = {
.dtr_rts = gb_tty_dtr_rts,
.activate = gb_tty_port_activate,
.shutdown = gb_tty_port_shutdown,
};
@ -922,6 +935,7 @@ static int gb_uart_probe(struct gbphy_device *gbphy_dev,
goto exit_connection_disable;
}
gbphy_runtime_put_autosuspend(gbphy_dev);
return 0;
exit_connection_disable:
@ -945,6 +959,11 @@ static void gb_uart_remove(struct gbphy_device *gbphy_dev)
struct gb_tty *gb_tty = gb_gbphy_get_data(gbphy_dev);
struct gb_connection *connection = gb_tty->connection;
struct tty_struct *tty;
int ret;
ret = gbphy_runtime_get_sync(gbphy_dev);
if (ret)
gbphy_runtime_get_noresume(gbphy_dev);
mutex_lock(&gb_tty->mutex);
gb_tty->disconnected = true;