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Code Issues Releases Wiki Activity

USB: Disable USB2 LPM at shutdown

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The QCA Rome USB Bluetooth controller has several issues once LPM gets
enabled:
- Fails to get enumerated in coldboot. [1]
- Drains more power (~ 0.2W) when the system is in S5. [2]
- Disappears after a warmboot. [2]

The issue happens because the device lingers at LPM L1 in S5, so device
can't get enumerated even after a reboot.

Disable LPM at shutdown to solve the issue.

[1] https://bugs.launchpad.net/bugs/1757218
[2] https://patchwork.kernel.org/patch/10607097/

Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Link: https://lore.kernel.org/r/20190805142412.23965-1-kai.heng.feng@canonical.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Kai-Heng Feng 2019-08-05 22:24:12 +08:00 committed by Greg Kroah-Hartman
parent d3523b6314
commit 582ee9c5ad
1 changed files with 9 additions and 0 deletions
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9
drivers/usb/core/port.c
View file

@ -285,6 +285,14 @@ static int usb_port_runtime_suspend(struct device *dev)
}
#endif
static void usb_port_shutdown(struct device *dev)
{
struct usb_port *port_dev = to_usb_port(dev);
if (port_dev->child)
usb_disable_usb2_hardware_lpm(port_dev->child);
}
static const struct dev_pm_ops usb_port_pm_ops = {
#ifdef CONFIG_PM
.runtime_suspend = usb_port_runtime_suspend,
@ -301,6 +309,7 @@ struct device_type usb_port_device_type = {
static struct device_driver usb_port_driver = {
.name = "usb",
.owner = THIS_MODULE,
.shutdown = usb_port_shutdown,
};
static int link_peers(struct usb_port *left, struct usb_port *right)