Commit 5ff33917 authored by Ilpo Järvinen's avatar Ilpo Järvinen Committed by Greg Kroah-Hartman
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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: default avatarVicente Bergas <vicencb@gmail.com>
Signed-off-by: default avatarIlpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20220426122448.38997-3-ilpo.jarvinen@linux.intel.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 642aa760

drivers/tty/serial/8250/8250_dwlib.c

+8 −2
Original line number Diff line number Diff line
@@ -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)