diff options
| -rw-r--r-- | drivers/serial/atmel_serial.c | 32 |
1 files changed, 19 insertions, 13 deletions
diff --git a/drivers/serial/atmel_serial.c b/drivers/serial/atmel_serial.c index 3a6da80b081c..61fb8b6d19af 100644 --- a/drivers/serial/atmel_serial.c +++ b/drivers/serial/atmel_serial.c @@ -131,7 +131,8 @@ struct atmel_uart_char { struct atmel_uart_port { struct uart_port uart; /* uart */ struct clk *clk; /* uart clock */ - unsigned short suspended; /* is port suspended? */ + int may_wakeup; /* cached value of device_may_wakeup for times we need to disable it */ + u32 backup_imr; /* IMR saved during suspend */ int break_active; /* break being received */ short use_dma_rx; /* enable PDC receiver */ @@ -984,8 +985,15 @@ static void atmel_serial_pm(struct uart_port *port, unsigned int state, * This is called on uart_open() or a resume event. */ clk_enable(atmel_port->clk); + + /* re-enable interrupts if we disabled some on suspend */ + UART_PUT_IER(port, atmel_port->backup_imr); break; case 3: + /* Back up the interrupt mask and disable all interrupts */ + atmel_port->backup_imr = UART_GET_IMR(port); + UART_PUT_IDR(port, -1); + /* * Disable the peripheral clock for this serial port. * This is called on uart_close() or a suspend event. @@ -1475,13 +1483,12 @@ static int atmel_serial_suspend(struct platform_device *pdev, cpu_relax(); } - if (device_may_wakeup(&pdev->dev) - && !atmel_serial_clk_will_stop()) - enable_irq_wake(port->irq); - else { - uart_suspend_port(&atmel_uart, port); - atmel_port->suspended = 1; - } + /* we can not wake up if we're running on slow clock */ + atmel_port->may_wakeup = device_may_wakeup(&pdev->dev); + if (atmel_serial_clk_will_stop()) + device_set_wakeup_enable(&pdev->dev, 0); + + uart_suspend_port(&atmel_uart, port); return 0; } @@ -1491,11 +1498,8 @@ static int atmel_serial_resume(struct platform_device *pdev) struct uart_port *port = platform_get_drvdata(pdev); struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); - if (atmel_port->suspended) { - uart_resume_port(&atmel_uart, port); - atmel_port->suspended = 0; - } else - disable_irq_wake(port->irq); + uart_resume_port(&atmel_uart, port); + device_set_wakeup_enable(&pdev->dev, atmel_port->may_wakeup); return 0; } @@ -1513,6 +1517,8 @@ static int __devinit atmel_serial_probe(struct platform_device *pdev) BUILD_BUG_ON(!is_power_of_2(ATMEL_SERIAL_RINGSIZE)); port = &atmel_ports[pdev->id]; + port->backup_imr = 0; + atmel_init_port(port, pdev); if (!atmel_use_dma_rx(&port->uart)) { |