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serial: mvebu-uart: add TX interrupt trigger for pulse interrupts

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Pulse interrupts (extended UART only) needs a change of state to trigger
the TX interrupt. In addition to enabling the TX_READY_INT_EN flag,
produce a FIFO state change from 'empty' to 'not full'. For this, write
only one data byte in TX start, making the TX FIFO not empty, and wait
for the TX interrupt to continue the transfer.

Signed-off-by: Allen Yan <yanwei@marvell.com>
Signed-off-by: Miquel Raynal <miquel.raynal@free-electrons.com>
Reviewed-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Allen Yan 2017-10-13 11:01:53 +02:00 committed by Greg Kroah-Hartman
parent 2ff23c4802
commit 30434b0713
1 changed files with 9 additions and 1 deletions
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10
drivers/tty/serial/mvebu-uart.c
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@ -165,8 +165,16 @@ static void mvebu_uart_stop_tx(struct uart_port *port)
static void mvebu_uart_start_tx(struct uart_port *port)
{
unsigned int ctl = readl(port->membase + UART_INTR(port));
unsigned int ctl;
struct circ_buf *xmit = &port->state->xmit;
if (IS_EXTENDED(port) && !uart_circ_empty(xmit)) {
writel(xmit->buf[xmit->tail], port->membase + UART_TSH(port));
xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
port->icount.tx++;
}
ctl = readl(port->membase + UART_INTR(port));
ctl |= CTRL_TX_RDY_INT(port);
writel(ctl, port->membase + UART_INTR(port));
}