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serial: 8250_dwlib: Implement SW half duplex support 

This patch enables support for SW half-duplex mode using em485.

Cc: Eric Tremblay <etremblay@distech-controls.com>
Cc: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Tested-by: Vicente Bergas <vicencb@gmail.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20220426122448.38997-3-ilpo.jarvinen@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ilpo Järvinen 2022-04-26 15:24:40 +03:00 committed by Greg Kroah-Hartman
parent 642aa7603e
commit 5ff33917fa
1 changed files with 8 additions and 2 deletions
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10
drivers/tty/serial/8250/8250_dwlib.c
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@ -157,8 +157,14 @@ void dw8250_setup_port(struct uart_port *p)
u32 reg;
pd->hw_rs485_support = dw8250_detect_rs485_hw(p);
if (pd->hw_rs485_support)
if (pd->hw_rs485_support) {
p->rs485_config = dw8250_rs485_config;
} else {
p->rs485_config = serial8250_em485_config;
up->rs485_start_tx = serial8250_em485_start_tx;
up->rs485_stop_tx = serial8250_em485_stop_tx;
}
up->capabilities |= UART_CAP_NOTEMT;
/*
* If the Component Version Register returns zero, we know that
@ -194,7 +200,7 @@ void dw8250_setup_port(struct uart_port *p)
p->type = PORT_16550A;
p->flags |= UPF_FIXED_TYPE;
p->fifosize = DW_UART_CPR_FIFO_SIZE(reg);
up->capabilities = UART_CAP_FIFO;
up->capabilities = UART_CAP_FIFO | UART_CAP_NOTEMT;
}
if (reg & DW_UART_CPR_AFCE_MODE)