netdev - Re: [PATCH net,stable] qmi_wwan: set DTR for modems in forced USB2 mode

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Date:   Mon, 17 Sep 2018 19:23:47 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     bjorn@...k.no
Cc:     netdev@...r.kernel.org, linux-usb@...r.kernel.org,
        fred.veldini@...il.com, dwen@...rrawireless.com
Subject: Re: [PATCH net,stable] qmi_wwan: set DTR for modems in forced USB2
 mode

From: Bjørn Mork <bjorn@...k.no>
Date: Mon, 17 Sep 2018 22:00:24 +0200

> Recent firmware revisions have added the ability to force
> these modems to USB2 mode, hiding their SuperSpeed
> capabilities from the host.  The driver has been using the
> SuperSpeed capability, as shown by the bcdUSB field of the
> device descriptor, to detect the need to enable the DTR
> quirk.  This method fails when the modems are forced to
> USB2 mode by the modem firmware.
> 
> Fix by unconditionally enabling the DTR quirk for the
> affected device IDs.
> 
> Reported-by: Fred Veldini <fred.veldini@...il.com>
> Reported-by: Deshu Wen <dwen@...rrawireless.com>
> Signed-off-by: Bjørn Mork <bjorn@...k.no>

Applied and queued up for -stable.