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authorSourav Poddar <sourav.poddar@ti.com>2013-05-15 21:05:38 +0530
committerJames Wylder <jwylder@motorola.com>2014-03-06 17:47:35 -0600
commit5cd73169fedb6c5272b005ed6220dedbcd6e8c6a (patch)
treec7514e0302327da69b8292bda261670bf8bb9bd2 /drivers/tty/serial/omap-serial.c
parent9d0d95aa53ab2fad9f3b3b137333db710ee576fa (diff)
downloadolio-linux-3.10-5cd73169fedb6c5272b005ed6220dedbcd6e8c6a.tar.xz
olio-linux-3.10-5cd73169fedb6c5272b005ed6220dedbcd6e8c6a.zip
serial: omap: prevent runtime PM for "no_console_suspend"
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>
Diffstat (limited to 'drivers/tty/serial/omap-serial.c')
-rw-r--r--drivers/tty/serial/omap-serial.c34
1 files changed, 33 insertions, 1 deletions
diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c
index f0b9f6b52b3..393a8eb98d7 100644
--- a/drivers/tty/serial/omap-serial.c
+++ b/drivers/tty/serial/omap-serial.c
@@ -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)))
@@ -1289,6 +1290,22 @@ 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);
@@ -1307,7 +1324,10 @@ 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)
{
@@ -1593,6 +1613,16 @@ 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;
@@ -1643,6 +1673,8 @@ 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)