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serial: omap: prevent runtime PM for "no_console_suspend"

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The driver manages "no_console_suspend" by preventing runtime PM
during the suspend path, which forces the console UART to stay awake.

Reviewed-by: Felipe Balbi <balbi@ti.com>
Reviewed-by: Kevin Hilman <khilman@linaro.org>
Tested-by: Kevin Hilman <khilman@linaro.org>
Signed-off-by: Sourav Poddar <sourav.poddar@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sourav Poddar 2013-05-15 21:05:38 +05:30 committed by Greg Kroah-Hartman
parent cf0ebee0d0
commit ddd85e225c
1 changed files with 33 additions and 1 deletions
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34
drivers/tty/serial/omap-serial.c
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@ -161,6 +161,7 @@ struct uart_omap_port {
u32 calc_latency;
struct work_struct qos_work;
struct pinctrl *pins;
bool is_suspending;
};
#define to_uart_omap_port(p) ((container_of((p), struct uart_omap_port, port)))
@ -1312,6 +1313,22 @@ static struct uart_driver serial_omap_reg = {
};
#ifdef CONFIG_PM_SLEEP
static int serial_omap_prepare(struct device *dev)
{
struct uart_omap_port *up = dev_get_drvdata(dev);
up->is_suspending = true;
return 0;
}
static void serial_omap_complete(struct device *dev)
{
struct uart_omap_port *up = dev_get_drvdata(dev);
up->is_suspending = false;
}
static int serial_omap_suspend(struct device *dev)
{
struct uart_omap_port *up = dev_get_drvdata(dev);
@ -1330,7 +1347,10 @@ static int serial_omap_resume(struct device *dev)
return 0;
}
#endif
#else
#define serial_omap_prepare NULL
#define serial_omap_prepare NULL
#endif /* CONFIG_PM_SLEEP */
static void omap_serial_fill_features_erratas(struct uart_omap_port *up)
{
@ -1616,6 +1636,16 @@ static int serial_omap_runtime_suspend(struct device *dev)
struct uart_omap_port *up = dev_get_drvdata(dev);
struct omap_uart_port_info *pdata = dev->platform_data;
/*
* When using 'no_console_suspend', the console UART must not be
* suspended. Since driver suspend is managed by runtime suspend,
* preventing runtime suspend (by returning error) will keep device
* active during suspend.
*/
if (up->is_suspending && !console_suspend_enabled &&
uart_console(&up->port))
return -EBUSY;
if (!up)
return -EINVAL;
@ -1666,6 +1696,8 @@ static const struct dev_pm_ops serial_omap_dev_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(serial_omap_suspend, serial_omap_resume)
SET_RUNTIME_PM_OPS(serial_omap_runtime_suspend,
serial_omap_runtime_resume, NULL)
.prepare = serial_omap_prepare,
.complete = serial_omap_complete,
};
#if defined(CONFIG_OF)