From: Thor Thayer <tthayer@xxxxxxxxxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxxxxxxxxx>
---
v2 Change from reading tx-loadsz parameter to reading
tx-threshold and calculating tx_loadsz.
---
drivers/tty/serial/8250/8250_of.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/tty/serial/8250/8250_of.c b/drivers/tty/serial/8250/8250_of.c
index 38963d7..7a8b5fc 100644
--- a/drivers/tty/serial/8250/8250_of.c
+++ b/drivers/tty/serial/8250/8250_of.c
@@ -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;
--
1.7.9.5
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