diff options
| -rw-r--r-- | drivers/tty/serial/imx.c | 39 |
1 files changed, 16 insertions, 23 deletions
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index 044e86d528ae..c86f1538bfdd 100644 --- a/drivers/tty/serial/imx.c +++ b/drivers/tty/serial/imx.c @@ -464,9 +464,19 @@ static inline void imx_transmit_buffer(struct imx_port *sport) { struct circ_buf *xmit = &sport->port.state->xmit; + if (sport->port.x_char) { + /* Send next char */ + writel(sport->port.x_char, sport->port.membase + URTX0); + return; + } + + if (uart_circ_empty(xmit) || uart_tx_stopped(&sport->port)) { + imx_stop_tx(&sport->port); + return; + } + while (!uart_circ_empty(xmit) && - !(readl(sport->port.membase + uts_reg(sport)) - & UTS_TXFULL)) { + !(readl(sport->port.membase + uts_reg(sport)) & UTS_TXFULL)) { /* send xmit->buf[xmit->tail] * out the port here */ writel(xmit->buf[xmit->tail], sport->port.membase + URTX0); @@ -567,9 +577,6 @@ static void imx_start_tx(struct uart_port *port) struct imx_port *sport = (struct imx_port *)port; unsigned long temp; - if (uart_circ_empty(&port->state->xmit)) - return; - if (USE_IRDA(sport)) { /* half duplex in IrDA mode; have to disable receive mode */ temp = readl(sport->port.membase + UCR4); @@ -604,7 +611,10 @@ static void imx_start_tx(struct uart_port *port) } if (sport->dma_is_enabled) { - imx_dma_tx(sport); + /* FIXME: port->x_char must be transmitted if != 0 */ + if (!uart_circ_empty(&port->state->xmit) && + !uart_tx_stopped(port)) + imx_dma_tx(sport); return; } @@ -632,27 +642,10 @@ static irqreturn_t imx_rtsint(int irq, void *dev_id) static irqreturn_t imx_txint(int irq, void *dev_id) { struct imx_port *sport = dev_id; - struct circ_buf *xmit = &sport->port.state->xmit; unsigned long flags; spin_lock_irqsave(&sport->port.lock, flags); - if (sport->port.x_char) { - /* Send next char */ - writel(sport->port.x_char, sport->port.membase + URTX0); - goto out; - } - - if (uart_circ_empty(xmit) || uart_tx_stopped(&sport->port)) { - imx_stop_tx(&sport->port); - goto out; - } - imx_transmit_buffer(sport); - - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) - uart_write_wakeup(&sport->port); - -out: spin_unlock_irqrestore(&sport->port.lock, flags); return IRQ_HANDLED; } |