diff options
Diffstat (limited to 'drivers/tty/serial/imx.c')
| -rw-r--r-- | drivers/tty/serial/imx.c | 21 |
1 files changed, 15 insertions, 6 deletions
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index 30edb35a6a15..522445a8f666 100644 --- a/drivers/tty/serial/imx.c +++ b/drivers/tty/serial/imx.c @@ -1907,16 +1907,12 @@ static void imx_uart_poll_put_char(struct uart_port *port, unsigned char c) #endif /* called with port.lock taken and irqs off or from .probe without locking */ -static int imx_uart_rs485_config(struct uart_port *port, +static int imx_uart_rs485_config(struct uart_port *port, struct ktermios *termios, struct serial_rs485 *rs485conf) { struct imx_port *sport = (struct imx_port *)port; u32 ucr2; - /* RTS is required to control the transmitter */ - if (!sport->have_rtscts && !sport->have_rtsgpio) - rs485conf->flags &= ~SER_RS485_ENABLED; - if (rs485conf->flags & SER_RS485_ENABLED) { /* Enable receiver if low-active RTS signal is requested */ if (sport->have_rtscts && !sport->have_rtsgpio && @@ -2200,6 +2196,14 @@ static enum hrtimer_restart imx_trigger_stop_tx(struct hrtimer *t) return HRTIMER_NORESTART; } +static const struct serial_rs485 imx_no_rs485 = {}; /* No RS485 if no RTS */ +static const struct serial_rs485 imx_rs485_supported = { + .flags = SER_RS485_ENABLED | SER_RS485_RTS_ON_SEND | SER_RS485_RTS_AFTER_SEND | + SER_RS485_RX_DURING_TX, + .delay_rts_before_send = 1, + .delay_rts_after_send = 1, +}; + /* Default RX DMA buffer configuration */ #define RX_DMA_PERIODS 16 #define RX_DMA_PERIOD_LEN (PAGE_SIZE / 4) @@ -2279,6 +2283,11 @@ static int imx_uart_probe(struct platform_device *pdev) sport->port.has_sysrq = IS_ENABLED(CONFIG_SERIAL_IMX_CONSOLE); sport->port.ops = &imx_uart_pops; sport->port.rs485_config = imx_uart_rs485_config; + /* RTS is required to control the RS485 transmitter */ + if (sport->have_rtscts || sport->have_rtsgpio) + sport->port.rs485_supported = imx_rs485_supported; + else + sport->port.rs485_supported = imx_no_rs485; sport->port.flags = UPF_BOOT_AUTOCONF; timer_setup(&sport->timer, imx_uart_timeout, 0); @@ -2338,7 +2347,7 @@ static int imx_uart_probe(struct platform_device *pdev) dev_err(&pdev->dev, "low-active RTS not possible when receiver is off, enabling receiver\n"); - imx_uart_rs485_config(&sport->port, &sport->port.rs485); + uart_rs485_config(&sport->port); /* Disable interrupts before requesting them */ ucr1 = imx_uart_readl(sport, UCR1); |