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Subject: Re: Geoffroy LETOURNEUR: Samsung AX200 system integration on Nvidia
 Nano.
From:   Dan Williams <dcbw@redhat.com>
To:     Duncan McDonald <d.mcdonald@samsung.com>,
        Martin Bourreau <m.bourreau@samsung.com>,
        Geoffroy Letourneur <g.letourneur@samsung.com>,
        Johannes Berg <johannes@sipsolutions.net>,
        Matthias May <matthias.may@neratec.com>,
        "linux-wireless@vger.kernel.org" <linux-wireless@vger.kernel.org>,
        "linuxwifi@intel.com" <linuxwifi@intel.com>
Cc:     Gilles Mazars <g.mazars@samsung.com>,
        "Kitty (Xia) Lou" <kitty.lou@samsung.com>,
        Harris Warren <harris.w@samsung.com>,
        Raymond Chan <raymond.chan@samsung.com>,
        "Seshu (Leela Seshu Reddy) Cheedepudi" <seshu.reddy@samsung.com>
Date:   Thu, 26 Mar 2020 15:47:04 -0500
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On Thu, 2020-03-26 at 17:45 +0000, Duncan McDonald wrote:
> Martin,
>=20
> Interesting. I knew there were issues for 802.11ax in the ISM band
> outside of the ones currently used for wifi, but it seems the issues
> extend to the current 5GHz band as well.

To be clear, I have no idea about this specific device or case. But
802.11h is an example of behavior required for legal/regulatory
reasons.

https://www.prowesswireless.com/post/2016/05/28/dfs-80211h
https://www.cisco.com/c/en/us/support/docs/wireless-mobility/80211/213882=
-radar-detection-in-dynamic-frequency-sel.html

Dan

> Duncan
>=20
> -----Original Message-----
> From: Martin Bourreau=20
> Sent: Thursday, March 26, 2020 10:39 AM
> To: Dan Williams <dcbw@redhat.com>; Geoffroy Letourneur <
> g.letourneur@samsung.com>; Johannes Berg <johannes@sipsolutions.net>;
> Matthias May <matthias.may@neratec.com>;=20
> linux-wireless@vger.kernel.org; linuxwifi@intel.com
> Cc: Gilles Mazars <g.mazars@samsung.com>; Kitty (Xia) Lou <
> kitty.lou@samsung.com>; Harris Warren <harris.w@samsung.com>; Raymond
> Chan <raymond.chan@samsung.com>; Duncan McDonald <
> d.mcdonald@samsung.com>; Seshu (Leela Seshu Reddy) Cheedepudi <
> seshu.reddy@samsung.com>
> Subject: Re: Geoffroy LETOURNEUR: Samsung AX200 system integration on
> Nvidia Nano.
>=20
> Adding people for awareness of the conversation.=20
>=20
> =EF=BB=BFLe 26/03/2020 15:32, =C2=AB Dan Williams =C2=BB <dcbw@redhat.c=
om> a =C3=A9crit :
>=20
>     On Thu, 2020-03-26 at 09:27 +0000, Geoffroy Letourneur wrote:
>     > Hello Johannes,
>     >=20
>     > What you mean by regulatory restrictions?
>     > Hardware restriction ?
>     > Software restriction ?
>     > Law restriction ?
>    =20
>     There are legal restrictions on spectrum use, especially in the
> 5Ghz
>     range. Which means additional effort must be put into both
> hardware and
>     software to satisfy those restrictions. And perhaps that effort
> was not
>     considered cost effective for the AX200.
>    =20
>     Dan
>    =20
>     > Best regards Geo
>     >=20
>     > --
>     > Geoffroy LETOURNEUR
>     > Embedded Software Engineer,
>     > SSIC, Paris
>     > =20
>     > Email: g.letourneur@samsung.com
>     > Tel: +33 6 45 14 24 32
>     > =20
>     > =20
>     > =20
>     >=20
>     > Le 26/03/2020 09:24, =C2=AB Johannes Berg =C2=BB <
> johannes@sipsolutions.net> a
>     > =C3=A9crit :
>     >=20
>     >     On Thu, 2020-03-26 at 08:19 +0000, Geoffroy Letourneur
> wrote:
>     >     > Hello Matthias,
>     >     >=20
>     >     > The AX200 module seems to support AP mode it works with
> 2.4GHz
>     > Wifi
>     >     > 802.11n mode, I tested it. But maybe it could not support
> this
>     > mode in
>     >     > 802.11ax.=20
>     >    =20
>     >     2.4 GHz should be OK - 5 GHz is generally limited on those
>     > devices due
>     >     to regulatory restrictions.
>     >    =20
>     >     johannes
>     >    =20
>     >    =20
>     >=20
>    =20
>    =20
>=20