From fa3540735425cb7f95a8d83e74dfdc84170d139b Mon Sep 17 00:00:00 2001 From: Michael Walle Date: Wed, 12 May 2021 16:12:53 +0200 Subject: [PATCH] serial: fsl_lpuart: remove manual RTSCTS control from 8-bit LPUART The LPUART doesn't have the ability to control the RTS or CTS line manually. Instead it will set it automatically when data is send or handle it when data is received. Thus drop the wrong code in set_mctrl. For the 32 bit version this was already done in the commit 2b30efe2e88a ("tty: serial: lpuart: Remove unnecessary code from set_mctrl"). Keep the 8-bit version in sync and remove it there, too. Signed-off-by: Michael Walle Link: https://lore.kernel.org/r/20210512141255.18277-8-michael@walle.cc Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/fsl_lpuart.c | 28 +--------------------------- 1 file changed, 1 insertion(+), 27 deletions(-) diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c index 080b462c61dc..895766599b84 100644 --- a/drivers/tty/serial/fsl_lpuart.c +++ b/drivers/tty/serial/fsl_lpuart.c @@ -1403,17 +1403,7 @@ static int lpuart32_config_rs485(struct uart_port *port, static unsigned int lpuart_get_mctrl(struct uart_port *port) { - unsigned int temp = 0; - unsigned char reg; - - reg = readb(port->membase + UARTMODEM); - if (reg & UARTMODEM_TXCTSE) - temp |= TIOCM_CTS; - - if (reg & UARTMODEM_RXRTSE) - temp |= TIOCM_RTS; - - return temp; + return 0; } static unsigned int lpuart32_get_mctrl(struct uart_port *port) @@ -1423,23 +1413,7 @@ static unsigned int lpuart32_get_mctrl(struct uart_port *port) static void lpuart_set_mctrl(struct uart_port *port, unsigned int mctrl) { - unsigned char temp; - struct lpuart_port *sport = container_of(port, - struct lpuart_port, port); - /* Make sure RXRTSE bit is not set when RS485 is enabled */ - if (!(sport->port.rs485.flags & SER_RS485_ENABLED)) { - temp = readb(sport->port.membase + UARTMODEM) & - ~(UARTMODEM_RXRTSE | UARTMODEM_TXCTSE); - - if (mctrl & TIOCM_RTS) - temp |= UARTMODEM_RXRTSE; - - if (mctrl & TIOCM_CTS) - temp |= UARTMODEM_TXCTSE; - - writeb(temp, port->membase + UARTMODEM); - } } static void lpuart32_set_mctrl(struct uart_port *port, unsigned int mctrl)