From: Kai-Heng Feng kai.heng.feng@canonical.com
commit d7a6c0ce8d26412903c7981503bad9e1cc7c45d2 upstream.
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().
Consolidate all checks into new LPM helpers to make sure LPM only gets enabled once.
Fixes: de68bab4fa96 ("usb: Don't enable USB 2.0 Link PM by default.”) Signed-off-by: Kai-Heng Feng kai.heng.feng@canonical.com Cc: stable stable@vger.kernel.org # after much soaking Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/usb/core/driver.c | 11 ++++++++--- drivers/usb/core/hub.c | 12 ++++-------- drivers/usb/core/message.c | 3 +-- 3 files changed, 13 insertions(+), 13 deletions(-)
--- a/drivers/usb/core/driver.c +++ b/drivers/usb/core/driver.c @@ -1904,9 +1904,6 @@ static int usb_set_usb2_hardware_lpm(str struct usb_hcd *hcd = bus_to_hcd(udev->bus); int ret = -EPERM;
- if (enable && !udev->usb2_hw_lpm_allowed) - return 0; - if (hcd->driver->set_usb2_hw_lpm) { ret = hcd->driver->set_usb2_hw_lpm(hcd, udev, enable); if (!ret) @@ -1918,11 +1915,19 @@ static int usb_set_usb2_hardware_lpm(str
int usb_enable_usb2_hardware_lpm(struct usb_device *udev) { + if (!udev->usb2_hw_lpm_capable || + !udev->usb2_hw_lpm_allowed || + udev->usb2_hw_lpm_enabled) + return 0; + return usb_set_usb2_hardware_lpm(udev, 1); }
int usb_disable_usb2_hardware_lpm(struct usb_device *udev) { + if (!udev->usb2_hw_lpm_enabled) + return 0; + return usb_set_usb2_hardware_lpm(udev, 0); }
--- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -3217,8 +3217,7 @@ int usb_port_suspend(struct usb_device * }
/* disable USB2 hardware LPM */ - if (udev->usb2_hw_lpm_enabled == 1) - usb_disable_usb2_hardware_lpm(udev); + usb_disable_usb2_hardware_lpm(udev);
if (usb_disable_ltm(udev)) { dev_err(&udev->dev, "Failed to disable LTM before suspend\n"); @@ -3256,8 +3255,7 @@ int usb_port_suspend(struct usb_device * usb_enable_ltm(udev); err_ltm: /* Try to enable USB2 hardware LPM again */ - if (udev->usb2_hw_lpm_capable == 1) - usb_enable_usb2_hardware_lpm(udev); + usb_enable_usb2_hardware_lpm(udev);
if (udev->do_remote_wakeup) (void) usb_disable_remote_wakeup(udev); @@ -3540,8 +3538,7 @@ int usb_port_resume(struct usb_device *u hub_port_logical_disconnect(hub, port1); } else { /* Try to enable USB2 hardware LPM */ - if (udev->usb2_hw_lpm_capable == 1) - usb_enable_usb2_hardware_lpm(udev); + usb_enable_usb2_hardware_lpm(udev);
/* Try to enable USB3 LTM */ usb_enable_ltm(udev); @@ -5608,8 +5605,7 @@ static int usb_reset_and_verify_device(s /* Disable USB2 hardware LPM. * It will be re-enabled by the enumeration process. */ - if (udev->usb2_hw_lpm_enabled == 1) - usb_disable_usb2_hardware_lpm(udev); + usb_disable_usb2_hardware_lpm(udev);
/* Disable LPM while we reset the device and reinstall the alt settings. * Device-initiated LPM, and system exit latency settings are cleared --- a/drivers/usb/core/message.c +++ b/drivers/usb/core/message.c @@ -1243,8 +1243,7 @@ void usb_disable_device(struct usb_devic dev->actconfig->interface[i] = NULL; }
- if (dev->usb2_hw_lpm_enabled == 1) - usb_disable_usb2_hardware_lpm(dev); + usb_disable_usb2_hardware_lpm(dev); usb_unlocked_disable_lpm(dev); usb_disable_ltm(dev);