netdev - Re: [PATCH net] qmi_wwan: add support for Quectel EC21 and EC25

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Message-Id: <20161013.100658.2004540239157240023.davem@davemloft.net>
Date:   Thu, 13 Oct 2016 10:06:58 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     bjorn@...k.no
Cc:     netdev@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH net] qmi_wwan: add support for Quectel EC21 and EC25

From: Bjørn Mork <bjorn@...k.no>
Date: Mon, 10 Oct 2016 21:12:49 +0200

> The Quectel EC21 and EC25 need the same "set DTR" request as devices
> based on the MDM9230 chipset, but has no USB3 support. Our best guess
> is that the "set DTR" functionality depends on chipset and/or
> baseband firmware generation. But USB3 is still an optional feature.
> 
> Since we cannot enable this unconditionally for all older devices, and
> there doesn't appear to be anything we can use in the USB descriptors
> to identify these chips, we are forced to use a device specific quirk
> flag.
> 
> Reported-and-tested-by: Sebastian Sjoholm <sebastian.sjoholm@...il.com>
> Signed-off-by: Bjørn Mork <bjorn@...k.no>

Applied.