[PATCH] tty: serial: men_z135_uart: Wakeup UART after transmitting
From: Johannes Thumshirn <hidden>
Date: 2014-06-13 06:11:15
Subsystem:
the rest, tty layer and serial drivers · Maintainers:
Linus Torvalds, Greg Kroah-Hartman, Jiri Slaby
From: Johannes Thumshirn <redacted> Call uart_write_wakeup() after writing the hardware FIFO and updateing the FIFO pointers. This fixes high latency and jitter on PPP over Serial links. Reported-by: Jun Shih <redacted> Tested-by: Jun Shih <redacted> Signed-off-by: Johannes Thumshirn <redacted> --- drivers/tty/serial/men_z135_uart.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/tty/serial/men_z135_uart.c b/drivers/tty/serial/men_z135_uart.c
index c9d1854..30e9e60 100644
--- a/drivers/tty/serial/men_z135_uart.c
+++ b/drivers/tty/serial/men_z135_uart.c@@ -308,9 +308,6 @@ static void men_z135_handle_tx(struct men_z135_port *uart) if (port->x_char) goto out; - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) - uart_write_wakeup(port); - /* calculate bytes to copy */ qlen = uart_circ_chars_pending(xmit); if (qlen <= 0)
@@ -357,6 +354,9 @@ static void men_z135_handle_tx(struct men_z135_port *uart) port->icount.tx += n; + if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + uart_write_wakeup(port); + irq_en: if (!uart_circ_empty(xmit)) men_z135_reg_set(uart, MEN_Z135_CONF_REG, MEN_Z135_IER_TXCIEN); --
1.9.1