linux-kernel - [PATCH 1/3] serial: 8250: Discard RTS/DTS setting from clock update method

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Date:   Wed, 23 Sep 2020 19:19:48 +0300
From:   Serge Semin <Sergey.Semin@...kalelectronics.ru>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
CC:     Serge Semin <Sergey.Semin@...kalelectronics.ru>,
        Serge Semin <fancer.lancer@...il.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Pavel Parkhomenko <Pavel.Parkhomenko@...kalelectronics.ru>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Maxime Ripard <mripard@...nel.org>,
        Will Deacon <will@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-serial@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/3] serial: 8250: Discard RTS/DTS setting from clock update method

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")
Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>
---
 drivers/tty/serial/8250/8250_port.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c
index c71d647eb87a..1259fb6b66b3 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);
-- 
2.27.0