From: Bjørn Mork <>
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 <>
> Signed-off-by: Bjørn Mork <>


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