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| author |   Kai-Heng Feng <kai.heng.feng@canonical.com> | 2019-01-12 03:54:25 +0800 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-01-18 10:02:56 +0100 |
| commit | d7a6c0ce8d26412903c7981503bad9e1cc7c45d2 (patch) | |
| tree | 7290ea96ae2ae03f491117ef10d90491ba3d05a8 /drivers/usb/core/message.c | |
| parent | USB: Add new USB LPM helpers (diff) | |
| download | wireguard-linux-d7a6c0ce8d26412903c7981503bad9e1cc7c45d2.tar.xz wireguard-linux-d7a6c0ce8d26412903c7981503bad9e1cc7c45d2.zip | |
USB: Consolidate LPM checks to avoid enabling LPM twice
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>
Diffstat (limited to 'drivers/usb/core/message.c')
| -rw-r--r-- | drivers/usb/core/message.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/drivers/usb/core/message.c b/drivers/usb/core/message.c index 35951aea7f50..4f33eb632a88 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_disable_usb2_hardware_lpm(dev); + usb_disable_usb2_hardware_lpm(dev); usb_unlocked_disable_lpm(dev); usb_disable_ltm(dev); |