This is a note to let you know that I've just added the patch titled
serial: 8250: Discard RTS/DTS setting from clock update method
to the 5.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
serial-8250-discard-rts-dts-setting-from-clock-updat.patch
and it can be found in the queue-5.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit a7eb267b603a759a389b68e33b36dbdc066212b9
Author: Serge Semin <Sergey.Semin@xxxxxxxxxxxxxxxxxxxx>
Date: Wed Sep 23 19:19:48 2020 +0300
serial: 8250: Discard RTS/DTS setting from clock update method
[ Upstream commit 7718453e36960dadb8dc46f2b514b309659e1270 ]
It has been a mistake to add the MCR register RTS/DTS fields setting in
the generic method of the UART reference clock update. There is no point
in asserting these lines at that procedure. Just discard the
serial8250_out_MCR() mathod invocation from there then.
Fixes: 868f3ee6e452 ("serial: 8250: Add 8250 port clock update method")
Tested-by: Hans de Goede <hdegoede@xxxxxxxxxx>
Signed-off-by: Serge Semin <Sergey.Semin@xxxxxxxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20200923161950.6237-2-Sergey.Semin@xxxxxxxxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c
index c71d647eb87a0..1259fb6b66b38 100644
--- a/drivers/tty/serial/8250/8250_port.c
+++ b/drivers/tty/serial/8250/8250_port.c
@@ -2665,7 +2665,6 @@ void serial8250_update_uartclk(struct uart_port *port, unsigned int uartclk)
serial8250_set_divisor(port, baud, quot, frac);
serial_port_out(port, UART_LCR, up->lcr);
- serial8250_out_MCR(up, UART_MCR_DTR | UART_MCR_RTS);
spin_unlock_irqrestore(&port->lock, flags);
serial8250_rpm_put(up);
