diff options
| author | Bjørn Mork <bjorn@mork.no> | 2016-03-03 22:20:53 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-03-07 20:37:39 +0100 |
| commit | 48906f62c96cc2cd35753e59310cb70eb08cc6a5 (patch) | |
| tree | 1ca9a13fe0f189a30d7e8b2dc04f01764ef8702f /drivers | |
| parent | usbnet: cleanup after bind() in probe() (diff) | |
| download | linux-48906f62c96cc2cd35753e59310cb70eb08cc6a5.tar.xz linux-48906f62c96cc2cd35753e59310cb70eb08cc6a5.zip | |
cdc_ncm: toggle altsetting to force reset before setup
Some devices will silently fail setup unless they are reset first.
This is necessary even if the data interface is already in
altsetting 0, which it will be when the device is probed for the
first time. Briefly toggling the altsetting forces a function
reset regardless of the initial state.
This fixes a setup problem observed on a number of Huawei devices,
appearing to operate in NTB-32 mode even if we explicitly set them
to NTB-16 mode.
Signed-off-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/usb/cdc_ncm.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/net/usb/cdc_ncm.c b/drivers/net/usb/cdc_ncm.c index dc0212c3cc28..be927964375b 100644 --- a/drivers/net/usb/cdc_ncm.c +++ b/drivers/net/usb/cdc_ncm.c @@ -837,7 +837,11 @@ int cdc_ncm_bind_common(struct usbnet *dev, struct usb_interface *intf, u8 data_ iface_no = ctx->data->cur_altsetting->desc.bInterfaceNumber; - /* reset data interface */ + /* Reset data interface. Some devices will not reset properly + * unless they are configured first. Toggle the altsetting to + * force a reset + */ + usb_set_interface(dev->udev, iface_no, data_altsetting); temp = usb_set_interface(dev->udev, iface_no, 0); if (temp) { dev_dbg(&intf->dev, "set interface failed\n"); |