diff options
Diffstat (limited to 'drivers/tty/serial/mpc52xx_uart.c')
| -rw-r--r-- | drivers/tty/serial/mpc52xx_uart.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/drivers/tty/serial/mpc52xx_uart.c b/drivers/tty/serial/mpc52xx_uart.c index 1093a88a1fe..bedac0d4c9c 100644 --- a/drivers/tty/serial/mpc52xx_uart.c +++ b/drivers/tty/serial/mpc52xx_uart.c @@ -262,8 +262,9 @@ static unsigned int mpc5200b_psc_set_baudrate(struct uart_port *port, port->uartclk / 4); divisor = (port->uartclk + 2 * baud) / (4 * baud); - /* select the proper prescaler and set the divisor */ - if (divisor > 0xffff) { + /* select the proper prescaler and set the divisor + * prefer high prescaler for more tolerance on low baudrates */ + if (divisor > 0xffff || baud <= 115200) { divisor = (divisor + 4) / 8; prescaler = 0xdd00; /* /32 */ } else @@ -507,7 +508,7 @@ static int __init mpc512x_psc_fifoc_init(void) psc_fifoc_irq = irq_of_parse_and_map(np, 0); of_node_put(np); - if (psc_fifoc_irq == NO_IRQ) { + if (psc_fifoc_irq == 0) { pr_err("%s: Can't get FIFOC irq\n", __func__); iounmap(psc_fifoc); return -ENODEV; @@ -1354,7 +1355,7 @@ static int __devinit mpc52xx_uart_of_probe(struct platform_device *op) } psc_ops->get_irq(port, op->dev.of_node); - if (port->irq == NO_IRQ) { + if (port->irq == 0) { dev_dbg(&op->dev, "Could not get irq\n"); return -EINVAL; } |