This patch is to expose usb port's pm qos flags(pm_qos_no_power_off,
pm_qos_remote_wakeup) to user space. User can set pm_qos_no_power_off
flag to prohibit the port from being power off.
Signed-off-by: Lan Tianyu <tianyu.lan@xxxxxxxxx>
---
drivers/usb/core/port.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/usb/core/port.c b/drivers/usb/core/port.c
index 8b66aeb..f5842e6 100644
--- a/drivers/usb/core/port.c
+++ b/drivers/usb/core/port.c
@@ -62,6 +62,7 @@ static void usb_port_device_release(struct device *dev)
{
struct usb_port *port_dev = to_usb_port(dev);
+ dev_pm_qos_hide_flags(dev);
usb_acpi_unregister_power_resources(dev);
kfree(port_dev);
}
@@ -145,8 +146,12 @@ int usb_hub_create_port_device(struct usb_hub *hub, int port1)
if (retval)
goto error_register;
- pm_runtime_set_active(&port_dev->dev);
- pm_runtime_enable(&port_dev->dev);
+ if (!dev_pm_qos_expose_flags(&port_dev->dev,
+ PM_QOS_FLAG_NO_POWER_OFF)) {
+ pm_runtime_set_active(&port_dev->dev);
+ pm_runtime_enable(&port_dev->dev);
+ }
+
usb_acpi_register_power_resources(&port_dev->dev);
return 0;
--
1.7.9.5
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