diff options
Diffstat (limited to 'drivers/tty/serial')
| -rw-r--r-- | drivers/tty/serial/imx.c | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index 4676916..aa07301 100644 --- a/drivers/tty/serial/imx.c +++ b/drivers/tty/serial/imx.c @@ -1224,11 +1224,32 @@ static int imx_startup(struct uart_port *port) temp |= (UCR2_RXEN | UCR2_TXEN); if (!sport->have_rtscts) temp |= UCR2_IRTS; + /* + * make sure the edge sensitive RTS-irq is disabled, + * we're using RTSD instead. + */ + if (!is_imx1_uart(sport)) + temp &= ~UCR2_RTSEN; writel(temp, sport->port.membase + UCR2); if (!is_imx1_uart(sport)) { temp = readl(sport->port.membase + UCR3); - temp |= IMX21_UCR3_RXDMUXSEL | UCR3_ADNIMP; + + /* + * The effect of RI and DCD differs depending on the UFCR_DCEDTE + * bit. In DCE mode they control the outputs, in DTE mode they + * enable the respective irqs. At least the DCD irq cannot be + * cleared on i.MX25 at least, so it's not usable and must be + * disabled. I don't have test hardware to check if RI has the + * same problem but I consider this likely so it's disabled for + * now, too. + */ + temp |= IMX21_UCR3_RXDMUXSEL | UCR3_ADNIMP | + UCR3_RI | UCR3_DCD; + + if (sport->dte_mode) + temp &= ~(UCR3_RI | UCR3_DCD); + writel(temp, sport->port.membase + UCR3); } |