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tty: serial: men_z135_uart: Wakeup UART after transmitting 

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 <Jun.Shih@pason.com>
Tested-by: Jun Shih <Jun.Shih@pason.com>
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@men.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
hifive-unleashed-5.1
Johannes Thumshirn 2014-06-16 07:33:38 +02:00 committed by Greg Kroah-Hartman
parent 8b152f1096
commit a9977620a4
1 changed files with 3 additions and 3 deletions
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6
drivers/tty/serial/men_z135_uart.c
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@ -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);