diff options
Diffstat (limited to 'drivers/tty/serial/8250/8250_mtk.c')
| -rw-r--r-- | drivers/tty/serial/8250/8250_mtk.c | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/drivers/tty/serial/8250/8250_mtk.c b/drivers/tty/serial/8250/8250_mtk.c index 417c7c810df9..211c483db9a7 100644 --- a/drivers/tty/serial/8250/8250_mtk.c +++ b/drivers/tty/serial/8250/8250_mtk.c @@ -10,6 +10,7 @@ #include <linux/module.h> #include <linux/of_irq.h> #include <linux/of_platform.h> +#include <linux/pinctrl/consumer.h> #include <linux/platform_device.h> #include <linux/pm_runtime.h> #include <linux/serial_8250.h> @@ -70,6 +71,7 @@ struct mtk8250_data { #ifdef CONFIG_SERIAL_8250_DMA enum dma_rx_status rx_status; #endif + int rx_wakeup_irq; }; /* flow control mode */ @@ -312,8 +314,21 @@ mtk8250_set_termios(struct uart_port *port, struct ktermios *termios, } #endif + /* + * Store the requested baud rate before calling the generic 8250 + * set_termios method. Standard 8250 port expects bauds to be + * no higher than (uartclk / 16) so the baud will be clamped if it + * gets out of that bound. Mediatek 8250 port supports speed + * higher than that, therefore we'll get original baud rate back + * after calling the generic set_termios method and recalculate + * the speed later in this method. + */ + baud = tty_termios_baud_rate(termios); + serial8250_do_set_termios(port, termios, old); + tty_termios_encode_baud_rate(termios, baud, baud); + /* * Mediatek UARTs use an extra highspeed register (MTK_UART_HIGHS) * @@ -345,6 +360,11 @@ mtk8250_set_termios(struct uart_port *port, struct ktermios *termios, */ spin_lock_irqsave(&port->lock, flags); + /* + * Update the per-port timeout. + */ + uart_update_timeout(port, termios->c_cflag, baud); + /* set DLAB we have cval saved in up->lcr from the call to the core */ serial_port_out(port, UART_LCR, up->lcr | UART_LCR_DLAB); serial_dl_write(up, quot); @@ -551,6 +571,8 @@ static int mtk8250_probe(struct platform_device *pdev) pm_runtime_set_active(&pdev->dev); pm_runtime_enable(&pdev->dev); + data->rx_wakeup_irq = platform_get_irq_optional(pdev, 1); + return 0; } @@ -572,15 +594,35 @@ static int mtk8250_remove(struct platform_device *pdev) static int __maybe_unused mtk8250_suspend(struct device *dev) { struct mtk8250_data *data = dev_get_drvdata(dev); + int irq = data->rx_wakeup_irq; + int err; serial8250_suspend_port(data->line); + pinctrl_pm_select_sleep_state(dev); + if (irq >= 0) { + err = enable_irq_wake(irq); + if (err) { + dev_err(dev, + "failed to enable irq wake on IRQ %d: %d\n", + irq, err); + pinctrl_pm_select_default_state(dev); + serial8250_resume_port(data->line); + return err; + } + } + return 0; } static int __maybe_unused mtk8250_resume(struct device *dev) { struct mtk8250_data *data = dev_get_drvdata(dev); + int irq = data->rx_wakeup_irq; + + if (irq >= 0) + disable_irq_wake(irq); + pinctrl_pm_select_default_state(dev); serial8250_resume_port(data->line); |