netdev - Re: [PATCH 1/1] NET: usb: cdc_mbim: add quirk for supporting Telit LE922A

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Date:   Wed, 07 Dec 2016 15:27:58 +0100
From:   Bjørn Mork <bjorn@...k.no>
To:     Daniele Palmas <dnlplm@...il.com>
Cc:     Oliver Neukum <oliver@...kum.org>, netdev@...r.kernel.org,
        linux-usb@...r.kernel.org
Subject: Re: [PATCH 1/1] NET: usb: cdc_mbim: add quirk for supporting Telit LE922A

Daniele Palmas <dnlplm@...il.com> writes:

> 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@...il.com>

Thanks.  This looks as nice as we can possibly do for now.  I am happy
to add

Reviewed-by: Bjørn Mork <bjorn@...k.no>

This patch also helped me understanding the problem you face even
better: It's not the "set_altsetting 0" that's causing problems, but the
"set_altsetting X" prior to that.  And that is certainly not something
that a firmware should expect. I will look at the Huawei modem again
when I get some time and see if there is any way we can possibly avoid
it.

Bjørn