diff options
| -rw-r--r-- | drivers/tty/serial/altera_uart.c | 30 |
1 files changed, 22 insertions, 8 deletions
diff --git a/drivers/tty/serial/altera_uart.c b/drivers/tty/serial/altera_uart.c index ae30398..4278437 100644 --- a/drivers/tty/serial/altera_uart.c +++ b/drivers/tty/serial/altera_uart.c @@ -109,6 +109,20 @@ static unsigned int altera_uart_get_mctrl(struct uart_port *port) return sigs; } +static void altera_uart_update_ctrl_reg(struct altera_uart *pp) +{ + unsigned short imr = pp->imr; + + /* + * If the device doesn't have an irq, ensure that the irq bits are + * masked out to keep the irq line inactive. + */ + if (!pp->port.irq) + imr &= ALTERA_UART_CONTROL_TRBK_MSK | ALTERA_UART_CONTROL_RTS_MSK; + + altera_uart_writel(&pp->port, imr, ALTERA_UART_CONTROL_REG); +} + static void altera_uart_set_mctrl(struct uart_port *port, unsigned int sigs) { struct altera_uart *pp = container_of(port, struct altera_uart, port); @@ -118,7 +132,7 @@ static void altera_uart_set_mctrl(struct uart_port *port, unsigned int sigs) pp->imr |= ALTERA_UART_CONTROL_RTS_MSK; else pp->imr &= ~ALTERA_UART_CONTROL_RTS_MSK; - altera_uart_writel(port, pp->imr, ALTERA_UART_CONTROL_REG); + altera_uart_update_ctrl_reg(pp); } static void altera_uart_start_tx(struct uart_port *port) @@ -126,7 +140,7 @@ static void altera_uart_start_tx(struct uart_port *port) struct altera_uart *pp = container_of(port, struct altera_uart, port); pp->imr |= ALTERA_UART_CONTROL_TRDY_MSK; - altera_uart_writel(port, pp->imr, ALTERA_UART_CONTROL_REG); + altera_uart_update_ctrl_reg(pp); } static void altera_uart_stop_tx(struct uart_port *port) @@ -134,7 +148,7 @@ static void altera_uart_stop_tx(struct uart_port *port) struct altera_uart *pp = container_of(port, struct altera_uart, port); pp->imr &= ~ALTERA_UART_CONTROL_TRDY_MSK; - altera_uart_writel(port, pp->imr, ALTERA_UART_CONTROL_REG); + altera_uart_update_ctrl_reg(pp); } static void altera_uart_stop_rx(struct uart_port *port) @@ -142,7 +156,7 @@ static void altera_uart_stop_rx(struct uart_port *port) struct altera_uart *pp = container_of(port, struct altera_uart, port); pp->imr &= ~ALTERA_UART_CONTROL_RRDY_MSK; - altera_uart_writel(port, pp->imr, ALTERA_UART_CONTROL_REG); + altera_uart_update_ctrl_reg(pp); } static void altera_uart_break_ctl(struct uart_port *port, int break_state) @@ -155,7 +169,7 @@ static void altera_uart_break_ctl(struct uart_port *port, int break_state) pp->imr |= ALTERA_UART_CONTROL_TRBK_MSK; else pp->imr &= ~ALTERA_UART_CONTROL_TRBK_MSK; - altera_uart_writel(port, pp->imr, ALTERA_UART_CONTROL_REG); + altera_uart_update_ctrl_reg(pp); spin_unlock_irqrestore(&port->lock, flags); } @@ -262,7 +276,7 @@ static void altera_uart_tx_chars(struct altera_uart *pp) if (xmit->head == xmit->tail) { pp->imr &= ~ALTERA_UART_CONTROL_TRDY_MSK; - altera_uart_writel(port, pp->imr, ALTERA_UART_CONTROL_REG); + altera_uart_update_ctrl_reg(pp); } } @@ -327,7 +341,7 @@ static int altera_uart_startup(struct uart_port *port) /* Enable RX interrupts now */ pp->imr = ALTERA_UART_CONTROL_RRDY_MSK; - altera_uart_writel(port, pp->imr, ALTERA_UART_CONTROL_REG); + altera_uart_update_ctrl_reg(pp); spin_unlock_irqrestore(&port->lock, flags); @@ -343,7 +357,7 @@ static void altera_uart_shutdown(struct uart_port *port) /* Disable all interrupts now */ pp->imr = 0; - altera_uart_writel(port, pp->imr, ALTERA_UART_CONTROL_REG); + altera_uart_update_ctrl_reg(pp); spin_unlock_irqrestore(&port->lock, flags); |
