From 7b8076ce8a00d553ae9d3b7eb5f0cc3e63cb16f1 Mon Sep 17 00:00:00 2001 From: Daniele Palmas Date: Wed, 7 Dec 2016 14:07:48 +0100 Subject: NET: usb: cdc_mbim: add quirk for supporting Telit LE922A MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 Reviewed-by: Bjørn Mork Signed-off-by: David S. Miller --- drivers/net/usb/cdc_ncm.c | 14 +++++++++----- 1 file changed, 9 insertions(+), 5 deletions(-) (limited to 'drivers/net/usb/cdc_ncm.c') diff --git a/drivers/net/usb/cdc_ncm.c b/drivers/net/usb/cdc_ncm.c index 877c9516e781..afbfc0f656f3 100644 --- a/drivers/net/usb/cdc_ncm.c +++ b/drivers/net/usb/cdc_ncm.c @@ -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); -- cgit