[PATCH] serial: keep the DTR setting for serial console.
with reverting "x86, serial: convert legacy COM ports to platform devices", we will have the serial console before the port is probled again.
uart_add_one_port==>uart_configure_port==>set_mcttrl(port, 0) will clear the DTR setting by uart_set_options(). then I will lose my output from serial console again.
So try to keep DTR in uart_configure_port()
Signed-off-by: Yinghai Lu <[email protected]>
Cc: Russell King <[email protected]>
Cc: Alan Cox <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Bjorn Helgaas <[email protected]>
diff --git a/drivers/serial/serial_core.c b/drivers/serial/serial_core.c
index 030a606..70f1106 100644
--- a/drivers/serial/serial_core.c
+++ b/drivers/serial/serial_core.c
@@ -2117,10 +2117,11 @@ uart_configure_port(struct uart_driver *drv, struct uart_state *state,
/*
* Ensure that the modem control lines are de-activated.
+ * keep the DTR setting that is set in uart_set_options()
* We probably don't need a spinlock around this, but
*/
spin_lock_irqsave(&port->lock, flags);
- port->ops->set_mctrl(port, 0);
+ port->ops->set_mctrl(port, port->mctrl & TIOCM_DTR);
spin_unlock_irqrestore(&port->lock, flags);
/*
-
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