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NET: usb: cdc_mbim: add quirk for supporting Telit LE922A

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Telit LE922A MBIM based composition does not work properly
with altsetting toggle done in cdc_ncm_bind_common.

This patch adds CDC_MBIM_FLAG_AVOID_ALTSETTING_TOGGLE quirk
to avoid this procedure that, instead, is mandatory for
other modems.

Signed-off-by: Daniele Palmas <dnlplm@gmail.com>
Reviewed-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniele Palmas
2016-12-07 14:07:48 +01:00
committed by David S. Miller
parent ec988ad78e
commit 7b8076ce8a
3 changed files with 32 additions and 6 deletions
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14
drivers/net/usb/cdc_ncm.c
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@@ -839,11 +839,18 @@ int cdc_ncm_bind_common(struct usbnet *dev, struct usb_interface *intf, u8 data_
iface_no = ctx->data->cur_altsetting->desc.bInterfaceNumber;
/* Device-specific flags */
ctx->drvflags = drvflags;
/* Reset data interface. Some devices will not reset properly
* unless they are configured first. Toggle the altsetting to
* force a reset
* force a reset.
* Some other devices do not work properly with this procedure
* that can be avoided using quirk CDC_MBIM_FLAG_AVOID_ALTSETTING_TOGGLE
*/
usb_set_interface(dev->udev, iface_no, data_altsetting);
if (!(ctx->drvflags & CDC_MBIM_FLAG_AVOID_ALTSETTING_TOGGLE))
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");
@@ -890,9 +897,6 @@ int cdc_ncm_bind_common(struct usbnet *dev, struct usb_interface *intf, u8 data_
/* finish setting up the device specific data */
cdc_ncm_setup(dev);
/* Device-specific flags */
ctx->drvflags = drvflags;
/* Allocate the delayed NDP if needed. */
if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END) {
ctx->delayed_ndp16 = kzalloc(ctx->max_ndp_size, GFP_KERNEL);