From: Philippe Schenker <philippe.schenker@toradex.com>
Date: Thu, 17 Oct 2019 14:14:38 +0000
Subject: tty: serial: lpuart: Remove unnecessary code from set_mctrl
Git-commit: 2b30efe2e88a398224abf9751a3fe1018375826f
Patch-mainline: v5.5-rc1
References: jsc#SLE-12251
Currently flow control is not working due to lpuart32_set_mctrl that is
clearing TXCTSE bit in all cases. This bit gets earlier setup by
lpuart32_set_termios.
As I read in Documentation set_mctrl is also not meant for hardware
flow control rather than gpio setting and clearing a RTS signal.
Therefore I guess it is safe to remove the whole code in
lpuart32_set_mctrl.
This was tested with console on a i.MX8QXP SoC.
Signed-off-by: Philippe Schenker <philippe.schenker@toradex.com>
Reviewed-by: Fugang Duan <fugang.duan@nxp.com>
Link: https://lore.kernel.org/r/20191017141428.10330-1-philippe.schenker@toradex.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Mian Yousaf Kaukab <yousaf.kaukab@suse.com>
---
drivers/tty/serial/fsl_lpuart.c | 11 -----------
1 file changed, 11 deletions(-)
diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index 537896c4d887..f3271857621c 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -1333,18 +1333,7 @@ static void lpuart_set_mctrl(struct uart_port *port, unsigned int mctrl)
static void lpuart32_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
- unsigned long temp;
-
- temp = lpuart32_read(port, UARTMODIR) &
- ~(UARTMODIR_RXRTSE | UARTMODIR_TXCTSE);
-
- if (mctrl & TIOCM_RTS)
- temp |= UARTMODIR_RXRTSE;
-
- if (mctrl & TIOCM_CTS)
- temp |= UARTMODIR_TXCTSE;
- lpuart32_write(port, temp, UARTMODIR);
}
static void lpuart_break_ctl(struct uart_port *port, int break_state)
--
2.26.2