From f826caa44902ddbe93174f0b642d8abf9698c08e Mon Sep 17 00:00:00 2001 From: Haavard Skinnemoen Date: Sun, 24 Feb 2008 14:34:45 +0100 Subject: atmel_serial: Fix build on avr32 with CONFIG_PM enabled AVR32 doesn't have at91_suspend_entering_slow_clock(). Just assume the clock will keep running for now. David has a better solution for this, but this works for now. Leaving the USART clock running won't prevent the PM code from entering deep power-down modes anyway. Signed-off-by: Haavard Skinnemoen Cc: David Brownell Cc: Andrew Victor --- drivers/serial/atmel_serial.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) (limited to 'drivers/serial') diff --git a/drivers/serial/atmel_serial.c b/drivers/serial/atmel_serial.c index 42be8b01a40..5f0414fc1b1 100644 --- a/drivers/serial/atmel_serial.c +++ b/drivers/serial/atmel_serial.c @@ -1439,6 +1439,15 @@ static struct uart_driver atmel_uart = { }; #ifdef CONFIG_PM +static bool atmel_serial_clk_will_stop(void) +{ +#ifdef CONFIG_ARCH_AT91 + return at91_suspend_entering_slow_clock(); +#else + return false; +#endif +} + static int atmel_serial_suspend(struct platform_device *pdev, pm_message_t state) { @@ -1446,7 +1455,7 @@ static int atmel_serial_suspend(struct platform_device *pdev, struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); if (device_may_wakeup(&pdev->dev) - && !at91_suspend_entering_slow_clock()) + && !atmel_serial_clk_will_stop()) enable_irq_wake(port->irq); else { uart_suspend_port(&atmel_uart, port); -- cgit v1.2.3 From e1c609efbc0333840f2af2d875ca52ed8ee18587 Mon Sep 17 00:00:00 2001 From: Haavard Skinnemoen Date: Fri, 14 Mar 2008 14:54:13 +0100 Subject: atmel_serial: Drain console TX shifter before suspending Funny things may happen if we stop the USART clock before the shifter is empty. Prevent this from happening by waiting until the shifter is completely drained before allowing suspend to continue. Signed-off-by: Haavard Skinnemoen Cc: Andrew Victor --- drivers/serial/atmel_serial.c | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'drivers/serial') diff --git a/drivers/serial/atmel_serial.c b/drivers/serial/atmel_serial.c index 5f0414fc1b1..6aeef22bd20 100644 --- a/drivers/serial/atmel_serial.c +++ b/drivers/serial/atmel_serial.c @@ -1454,6 +1454,12 @@ static int atmel_serial_suspend(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_is_console_port(port) && console_suspend_enabled) { + /* Drain the TX shifter */ + while (!(UART_GET_CSR(port) & ATMEL_US_TXEMPTY)) + cpu_relax(); + } + if (device_may_wakeup(&pdev->dev) && !atmel_serial_clk_will_stop()) enable_irq_wake(port->irq); -- cgit v1.2.3