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 <[email protected]> --- v3: - Consolidate udev->usb2_hw_lpm_capable and udev->usb2_hw_lpm_enabled check to usb_set_usb2_hardware_lpm(). v2: - Check udev->usb2_hw_lpm_enabled before calling usb_port_resume(). drivers/usb/core/driver.c | 4 +++- drivers/usb/core/hub.c | 13 ++++--------- drivers/usb/core/message.c | 3 +-- 3 files changed, 8 insertions(+), 12 deletions(-) diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c index 53564386ed57..f277a8de7498 100644 --- a/drivers/usb/core/driver.c +++ b/drivers/usb/core/driver.c @@ -1901,7 +1901,9 @@ int usb_set_usb2_hardware_lpm(struct usb_device *udev, int enable) struct usb_hcd *hcd = bus_to_hcd(udev->bus); int ret = -EPERM; - if (enable && !udev->usb2_hw_lpm_allowed) + if (!udev->usb2_hw_lpm_capable || + (enable && !udev->usb2_hw_lpm_allowed) || + (enable && udev->usb2_hw_lpm_enabled)) return 0; if (hcd->driver->set_usb2_hw_lpm) { diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index e482e5f103d9..907793d38a82 100644 --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -3210,8 +3210,7 @@ int usb_port_suspend(struct usb_device *udev, pm_message_t msg) } /* disable USB2 hardware LPM */ - if (udev->usb2_hw_lpm_enabled == 1) - usb_set_usb2_hardware_lpm(udev, 0); + usb_set_usb2_hardware_lpm(udev, 0); if (usb_disable_ltm(udev)) { dev_err(&udev->dev, "Failed to disable LTM before suspend\n"); @@ -3249,8 +3248,7 @@ int usb_port_suspend(struct usb_device *udev, pm_message_t msg) usb_enable_ltm(udev); err_ltm: /* Try to enable USB2 hardware LPM again */ - if (udev->usb2_hw_lpm_capable == 1) - usb_set_usb2_hardware_lpm(udev, 1); + usb_set_usb2_hardware_lpm(udev, 1); if (udev->do_remote_wakeup) (void) usb_disable_remote_wakeup(udev); @@ -3533,9 +3531,7 @@ 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 && - !udev->usb2_hw_lpm_enabled) - usb_set_usb2_hardware_lpm(udev, 1); + usb_set_usb2_hardware_lpm(udev, 1); /* Try to enable USB3 LTM */ usb_enable_ltm(udev); @@ -5639,8 +5635,7 @@ static int usb_reset_and_verify_device(struct usb_device *udev) /* Disable USB2 hardware LPM. * It will be re-enabled by the enumeration process. */ - if (udev->usb2_hw_lpm_enabled == 1) - usb_set_usb2_hardware_lpm(udev, 0); + usb_set_usb2_hardware_lpm(udev, 0); /* Disable LPM while we reset the device and reinstall the alt settings. * Device-initiated LPM, and system exit latency settings are cleared diff --git a/drivers/usb/core/message.c b/drivers/usb/core/message.c index bfa5eda0cc26..a00952bdf645 100644 --- a/drivers/usb/core/message.c +++ b/drivers/usb/core/message.c @@ -1243,8 +1243,7 @@ void usb_disable_device(struct usb_device *dev, int skip_ep0) dev->actconfig->interface[i] = NULL; } - if (dev->usb2_hw_lpm_enabled == 1) - usb_set_usb2_hardware_lpm(dev, 0); + usb_set_usb2_hardware_lpm(dev, 0); usb_unlocked_disable_lpm(dev); usb_disable_ltm(dev); -- 2.17.1
