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-rw-r--r--drivers/tty/serial/8250/8250_omap.c3
-rw-r--r--drivers/tty/serial/8250/8250_pci.c9
-rw-r--r--drivers/tty/serial/8250/8250_port.c12
-rw-r--r--drivers/tty/serial/fsl_lpuart.c8
-rw-r--r--drivers/tty/serial/imx.c8
-rw-r--r--drivers/tty/serial/serial_core.c30
6 files changed, 33 insertions, 37 deletions
diff --git a/drivers/tty/serial/8250/8250_omap.c b/drivers/tty/serial/8250/8250_omap.c
index 73e5f1dbd075..806f7806d3ca 100644
--- a/drivers/tty/serial/8250/8250_omap.c
+++ b/drivers/tty/serial/8250/8250_omap.c
@@ -342,6 +342,9 @@ static void omap8250_restore_regs(struct uart_8250_port *up)
omap8250_update_mdr1(up, priv);
up->port.ops->set_mctrl(&up->port, up->port.mctrl);
+
+ if (up->port.rs485.flags & SER_RS485_ENABLED)
+ serial8250_em485_stop_tx(up);
}
/*
diff --git a/drivers/tty/serial/8250/8250_pci.c b/drivers/tty/serial/8250/8250_pci.c
index 1d37ff0ec85a..8f0dafbab3bf 100644
--- a/drivers/tty/serial/8250/8250_pci.c
+++ b/drivers/tty/serial/8250/8250_pci.c
@@ -1739,7 +1739,6 @@ static int pci_fintek_init(struct pci_dev *dev)
resource_size_t bar_data[3];
u8 config_base;
struct serial_private *priv = pci_get_drvdata(dev);
- struct uart_8250_port *port;
if (!(pci_resource_flags(dev, 5) & IORESOURCE_IO) ||
!(pci_resource_flags(dev, 4) & IORESOURCE_IO) ||
@@ -1786,13 +1785,7 @@ static int pci_fintek_init(struct pci_dev *dev)
pci_write_config_byte(dev, config_base + 0x06, dev->irq);
- if (priv) {
- /* re-apply RS232/485 mode when
- * pciserial_resume_ports()
- */
- port = serial8250_get_port(priv->line[i]);
- pci_fintek_rs485_config(&port->port, NULL);
- } else {
+ if (!priv) {
/* First init without port data
* force init to RS232 Mode
*/
diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c
index ec7846223f3a..edb975097c89 100644
--- a/drivers/tty/serial/8250/8250_port.c
+++ b/drivers/tty/serial/8250/8250_port.c
@@ -600,7 +600,7 @@ EXPORT_SYMBOL_GPL(serial8250_rpm_put);
static int serial8250_em485_init(struct uart_8250_port *p)
{
if (p->em485)
- return 0;
+ goto deassert_rts;
p->em485 = kmalloc(sizeof(struct uart_8250_em485), GFP_ATOMIC);
if (!p->em485)
@@ -616,7 +616,9 @@ static int serial8250_em485_init(struct uart_8250_port *p)
p->em485->active_timer = NULL;
p->em485->tx_stopped = true;
- p->rs485_stop_tx(p);
+deassert_rts:
+ if (p->em485->tx_stopped)
+ p->rs485_stop_tx(p);
return 0;
}
@@ -2034,6 +2036,9 @@ EXPORT_SYMBOL_GPL(serial8250_do_set_mctrl);
static void serial8250_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
+ if (port->rs485.flags & SER_RS485_ENABLED)
+ return;
+
if (port->set_mctrl)
port->set_mctrl(port, mctrl);
else
@@ -3191,9 +3196,6 @@ static void serial8250_config_port(struct uart_port *port, int flags)
if (flags & UART_CONFIG_TYPE)
autoconfig(up);
- if (port->rs485.flags & SER_RS485_ENABLED)
- port->rs485_config(port, &port->rs485);
-
/* if access method is AU, it is a 16550 with a quirk */
if (port->type == PORT_16550A && port->iotype == UPIO_AU)
up->bugs |= UART_BUG_NOMSR;
diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index 185dd417fc49..44ed4285e1ef 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -2733,10 +2733,6 @@ static int lpuart_probe(struct platform_device *pdev)
if (ret)
goto failed_reset;
- ret = uart_add_one_port(&lpuart_reg, &sport->port);
- if (ret)
- goto failed_attach_port;
-
ret = uart_get_rs485_mode(&sport->port);
if (ret)
goto failed_get_rs485;
@@ -2748,7 +2744,9 @@ static int lpuart_probe(struct platform_device *pdev)
sport->port.rs485.delay_rts_after_send)
dev_err(&pdev->dev, "driver doesn't support RTS delays\n");
- sport->port.rs485_config(&sport->port, &sport->port.rs485);
+ ret = uart_add_one_port(&lpuart_reg, &sport->port);
+ if (ret)
+ goto failed_attach_port;
ret = devm_request_irq(&pdev->dev, sport->port.irq, handler, 0,
DRIVER_NAME, sport);
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index b7ef075a4005..c6a93d6a9464 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -380,8 +380,7 @@ static void imx_uart_rts_active(struct imx_port *sport, u32 *ucr2)
{
*ucr2 &= ~(UCR2_CTSC | UCR2_CTS);
- sport->port.mctrl |= TIOCM_RTS;
- mctrl_gpio_set(sport->gpios, sport->port.mctrl);
+ mctrl_gpio_set(sport->gpios, sport->port.mctrl | TIOCM_RTS);
}
/* called with port.lock taken and irqs caller dependent */
@@ -390,8 +389,7 @@ static void imx_uart_rts_inactive(struct imx_port *sport, u32 *ucr2)
*ucr2 &= ~UCR2_CTSC;
*ucr2 |= UCR2_CTS;
- sport->port.mctrl &= ~TIOCM_RTS;
- mctrl_gpio_set(sport->gpios, sport->port.mctrl);
+ mctrl_gpio_set(sport->gpios, sport->port.mctrl & ~TIOCM_RTS);
}
static void start_hrtimer_ms(struct hrtimer *hrt, unsigned long msec)
@@ -2318,8 +2316,6 @@ 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);
-
/* Disable interrupts before requesting them */
ucr1 = imx_uart_readl(sport, UCR1);
ucr1 &= ~(UCR1_ADEN | UCR1_TRDYEN | UCR1_IDEN | UCR1_RRDYEN | UCR1_RTSDEN);
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index 48dafd1e084b..5f8f0a90ce55 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -149,15 +149,10 @@ uart_update_mctrl(struct uart_port *port, unsigned int set, unsigned int clear)
unsigned long flags;
unsigned int old;
- if (port->rs485.flags & SER_RS485_ENABLED) {
- set &= ~TIOCM_RTS;
- clear &= ~TIOCM_RTS;
- }
-
spin_lock_irqsave(&port->lock, flags);
old = port->mctrl;
port->mctrl = (old & ~clear) | set;
- if (old != port->mctrl)
+ if (old != port->mctrl && !(port->rs485.flags & SER_RS485_ENABLED))
port->ops->set_mctrl(port, port->mctrl);
spin_unlock_irqrestore(&port->lock, flags);
}
@@ -1332,8 +1327,13 @@ static int uart_set_rs485_config(struct uart_port *port,
spin_lock_irqsave(&port->lock, flags);
ret = port->rs485_config(port, &rs485);
- if (!ret)
+ if (!ret) {
port->rs485 = rs485;
+
+ /* Reset RTS and other mctrl lines when disabling RS485 */
+ if (!(rs485.flags & SER_RS485_ENABLED))
+ port->ops->set_mctrl(port, port->mctrl);
+ }
spin_unlock_irqrestore(&port->lock, flags);
if (ret)
return ret;
@@ -2306,7 +2306,8 @@ int uart_resume_port(struct uart_driver *drv, struct uart_port *uport)
uart_change_pm(state, UART_PM_STATE_ON);
spin_lock_irq(&uport->lock);
- ops->set_mctrl(uport, 0);
+ if (!(uport->rs485.flags & SER_RS485_ENABLED))
+ ops->set_mctrl(uport, 0);
spin_unlock_irq(&uport->lock);
if (console_suspend_enabled || !uart_console(uport)) {
/* Protected by port mutex for now */
@@ -2317,7 +2318,10 @@ int uart_resume_port(struct uart_driver *drv, struct uart_port *uport)
if (tty)
uart_change_speed(tty, state, NULL);
spin_lock_irq(&uport->lock);
- ops->set_mctrl(uport, uport->mctrl);
+ if (!(uport->rs485.flags & SER_RS485_ENABLED))
+ ops->set_mctrl(uport, uport->mctrl);
+ else
+ uport->rs485_config(uport, &uport->rs485);
ops->start_tx(uport);
spin_unlock_irq(&uport->lock);
tty_port_set_initialized(port, 1);
@@ -2423,10 +2427,10 @@ uart_configure_port(struct uart_driver *drv, struct uart_state *state,
*/
spin_lock_irqsave(&port->lock, flags);
port->mctrl &= TIOCM_DTR;
- if (port->rs485.flags & SER_RS485_ENABLED &&
- !(port->rs485.flags & SER_RS485_RTS_AFTER_SEND))
- port->mctrl |= TIOCM_RTS;
- port->ops->set_mctrl(port, port->mctrl);
+ if (!(port->rs485.flags & SER_RS485_ENABLED))
+ port->ops->set_mctrl(port, port->mctrl);
+ else
+ port->rs485_config(port, &port->rs485);
spin_unlock_irqrestore(&port->lock, flags);
/*
generated by cgit v1.2.3 (git 2.46.0) at 2025-09-26 18:12:05 +0000