The patch titled
serial: assert DTR for serial console devices
has been removed from the -mm tree. Its filename was
serial-assert-dtr-for-serial-console-devices.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
Subject: serial: assert DTR for serial console devices
From: Yinghai Lu <Yinghai.Lu@xxxxxxx>
Some RS-232 devices require DTR to be asserted before they can be used. DTR
is normally asserted in uart_startup() when the port is opened. But we don't
actually open serial console ports, so assert DTR when the port is added.
BTW:
earlyprintk and early_uart are hard coded to set DTR/RTS.
rmk says
The only issue I can think of is the possibility for an attached modem to
auto-answer or maybe even auto-dial before the system is ready for it to do
so. Might have an undesirable cost implication for some running with such a
setup.
Apart from that, I can't think of any other side effect of this specific
patch.
Signed-off-by: Yinghai Lu <yinghai.lu@xxxxxxx>
Acked-by: Russell King <rmk@xxxxxxxxxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxx>
Cc: Bjorn Helgaas <bjorn.helgaas@xxxxxx>
Cc: Gerd Hoffmann <kraxel@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/serial/serial_core.c | 6 ++++++
1 file changed, 6 insertions(+)
diff -puN drivers/serial/serial_core.c~serial-assert-dtr-for-serial-console-devices drivers/serial/serial_core.c
--- a/drivers/serial/serial_core.c~serial-assert-dtr-for-serial-console-devices
+++ a/drivers/serial/serial_core.c
@@ -1910,6 +1910,12 @@ uart_set_options(struct uart_port *port,
if (flow == 'r')
termios.c_cflag |= CRTSCTS;
+ /*
+ * some uarts on other side don't support no flow control.
+ * So we set * DTR in host uart to make them happy
+ */
+ port->mctrl |= TIOCM_DTR;
+
port->ops->set_termios(port, &termios, NULL);
co->cflag = termios.c_cflag;
_
Patches currently in -mm which might be from Yinghai.Lu@xxxxxxx are
origin.patch
x86-64-disable-the-gart-in-shutdown.patch
x86_84-move-iommu-declaration-from-proto-to-iommuh.patch
x86_64-change-_map_single-to-static-in-pci_gartc-etc.patch
x86_64-geode-hw-random-number-generator-depend-on-x86_3.patch
x86_64-get-mp_bus_to_node-as-early.patch
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