We found the baud rate is changed after S3 on some Intel Broxton
platforms. The baud rate should be restored during resume. However, some
set_termios() callback such as dw8250_set_termios() for DesignWare 8250
will skip setting if old termios is NULL. We address this issue via
passing a dummy.
Signed-off-by: Chen Hu <hu1.chen@xxxxxxxxx>
---
drivers/tty/serial/serial_core.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index f02965936f2e..8b815f1539e8 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -2217,6 +2217,7 @@ int uart_resume_port(struct uart_driver *drv, struct uart_port *uport)
struct device *tty_dev;
struct uart_match match = {uport, drv};
struct ktermios termios;
+ static struct ktermios dummy;
mutex_lock(&port->mutex);
@@ -2277,7 +2278,7 @@ int uart_resume_port(struct uart_driver *drv, struct uart_port *uport)
pm_runtime_put_autosuspend(uport->dev);
if (ret == 0) {
if (tty)
- uart_change_speed(tty, state, NULL);
+ uart_change_speed(tty, state, &dummy);
pm_runtime_get_sync(uport->dev);
spin_lock_irq(&uport->lock);
ops->set_mctrl(uport, uport->mctrl);
--
2.13.0
--
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