serial: 8250: of: Load TX FIFO Threshold from DT (ffea0439) · Commits · 戴 / test

Initialize the tx_loadsz parameter from passed in devicetree tx-threshold parameter. The tx_loadsz is calculated as the number of bytes to fill FIFO when tx-threshold is triggered. Signed-off-by:

Thor Thayer <tthayer@opensource.altera.com> Signed-off-by:

Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/8250/8250_of.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -195,6 +195,7 @@ static int of_platform_serial_probe(struct platform_device *ofdev)
		switch (port_type) {
		case PORT_8250 ... PORT_MAX_8250:
		{
		u32 tx_threshold;
		struct uart_8250_port port8250;
		memset(&port8250, 0, sizeof(port8250));
		port8250.port = port;
		@@ -202,6 +203,12 @@ static int of_platform_serial_probe(struct platform_device *ofdev)
		if (port.fifosize)
		port8250.capabilities = UART_CAP_FIFO;

		/* Check for TX FIFO threshold & set tx_loadsz */
		if ((of_property_read_u32(ofdev->dev.of_node, "tx-threshold",
		&tx_threshold) == 0) &&
		(tx_threshold < port.fifosize))
		port8250.tx_loadsz = port.fifosize - tx_threshold;

		if (of_property_read_bool(ofdev->dev.of_node,
		"auto-flow-control"))
		port8250.capabilities \|= UART_CAP_AFE;

Admin message