USB Bluetooth controller QCA ROME (0cf3:e007) sometimes stops working
after S3:
[ 165.110742] Bluetooth: hci0: using NVM file: qca/nvm_usb_00000302.bin
[ 168.432065] Bluetooth: hci0: Failed to send body at 4 of 1953 (-110)
After some experiments, I found that disabling LPM can workaround the
issue.
On some platforms, the USB power is cut during S3, so the driver uses
reset-resume to resume the device. During port resume, LPM gets enabled
twice, by usb_reset_and_verify_device() and usb_port_resume().
So let's enable LPM for just once, as this solves the issue for the
device in question.
Signed-off-by: Kai-Heng Feng <kai.heng.feng@xxxxxxxxxxxxx>
---
v2:
- Check udev->usb2_hw_lpm_enabled before calling usb_port_resume().
drivers/usb/core/hub.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index c6077d582d29..02fa574e98ce 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -3523,7 +3523,8 @@ int usb_port_resume(struct usb_device *udev, pm_message_t msg)
hub_port_logical_disconnect(hub, port1);
} else {
/* Try to enable USB2 hardware LPM */
- if (udev->usb2_hw_lpm_capable == 1)
+ if (udev->usb2_hw_lpm_capable == 1 &&
+ !udev->usb2_hw_lpm_enabled)
usb_set_usb2_hardware_lpm(udev, 1);
/* Try to enable USB3 LTM */
--
2.19.1
