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serial: 8250_dwlib: remove redundant sanity check for RS485 flags

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Before the drivers rs485_config() function is called the serial core
already ensures that only one of both options RTS on send or RTS after send
is set. So remove the concerning sanity check in the driver function to
avoid redundancy.

Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Lino Sanfilippo <l.sanfilippo@kunbus.com>
Link: https://lore.kernel.org/r/20220710164442.2958979-8-LinoSanfilippo@gmx.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Lino Sanfilippo 2022-07-10 18:44:41 +02:00 committed by Greg Kroah-Hartman
parent 885dcb08c9
commit c64e17584b
1 changed files with 2 additions and 8 deletions
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10
drivers/tty/serial/8250/8250_dwlib.c
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@ -187,16 +187,10 @@ static int dw8250_rs485_config(struct uart_port *p, struct ktermios *termios,
if (rs485->flags & SER_RS485_ENABLED) {
tcr |= DW_UART_TCR_RS485_EN;
if (rs485->flags & SER_RS485_RX_DURING_TX) {
if (rs485->flags & SER_RS485_RX_DURING_TX)
tcr |= DW_UART_TCR_XFER_MODE_DE_DURING_RE;
} else {
/* HW does not support same DE level for tx and rx */
if (!(rs485->flags & SER_RS485_RTS_ON_SEND) ==
!(rs485->flags & SER_RS485_RTS_AFTER_SEND))
return -EINVAL;
else
tcr |= DW_UART_TCR_XFER_MODE_DE_OR_RE;
}
dw8250_writel_ext(p, DW_UART_DE_EN, 1);
dw8250_writel_ext(p, DW_UART_RE_EN, 1);
} else {