The patch titled
serial: assert DTR for serial console devices
has been added to the -mm tree. Its filename is
serial-assert-dtr-for-serial-console-devices.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: serial: assert DTR for serial console devices
From: Yinghai Lu <[EMAIL PROTECTED]>
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.
Signed-off-by: Yinghai Lu <[EMAIL PROTECTED]>
Acked-by: Russell King <[EMAIL PROTECTED]>
Cc: Andi Kleen <[EMAIL PROTECTED]>
Cc: Bjorn Helgaas <[EMAIL PROTECTED]>
Cc: Gerd Hoffmann <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
---
drivers/serial/serial_core.c | 6 ++++++
1 files 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
@@ -1918,6 +1918,12 @@ 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 [EMAIL PROTECTED] are
console-more-buf-for-index-parsing.patch
console-console-handover-to-preferred-console.patch
serial-convert-early_uart-to-earlycon-for-8250.patch
serial-convert-early_uart-to-earlycon-for-8250-fix.patch
serial-assert-dtr-for-serial-console-devices.patch
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