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From:   Kalle Valo <kvalo@codeaurora.org>
To:     Lorenzo Bianconi <lorenzo.bianconi@redhat.com>
Cc:     Lorenzo Bianconi <lorenzo@kernel.org>,
        Felix Fietkau <nbd@nbd.name>,
        linux-wireless <linux-wireless@vger.kernel.org>,
        Ryder Lee <ryder.lee@mediatek.com>,
        Roy Luo <royluo@google.com>, YF Luo <yf.luo@mediatek.com>
Subject: Re: [PATCH 4/6] mt76: mt7615: unlock dfs bands
References: <cover.1561804422.git.lorenzo@kernel.org>
        <33184e0b78983fe7c79fa70c5fbb21042aafa4f5.1561804422.git.lorenzo@kernel.org>
        <87muhzs9qv.fsf@purkki.adurom.net>
        <CAJ0CqmU6TLhFa4ZJxWHBzvpx+5g5E4-WkSPECx47F9d3T=5YjQ@mail.gmail.com>
Date:   Mon, 01 Jul 2019 10:59:22 +0300
In-Reply-To: <CAJ0CqmU6TLhFa4ZJxWHBzvpx+5g5E4-WkSPECx47F9d3T=5YjQ@mail.gmail.com>
        (Lorenzo Bianconi's message of "Sun, 30 Jun 2019 13:25:56 +0200")
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Lorenzo Bianconi <lorenzo.bianconi@redhat.com> writes:

>>
>> Lorenzo Bianconi <lorenzo@kernel.org> writes:
>>
>> > Unlock dfs channels since now mt7615 driver supports radar detection
>> >
>> > Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
>> > ---
>> >  drivers/net/wireless/mediatek/mt76/mt7615/init.c | 6 ++++++
>> >  1 file changed, 6 insertions(+)
>> >
>> > diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/init.c b/drivers/net/wireless/mediatek/mt76/mt7615/init.c
>> > index 5dc4cced5789..6d336d82cafe 100644
>> > --- a/drivers/net/wireless/mediatek/mt76/mt7615/init.c
>> > +++ b/drivers/net/wireless/mediatek/mt76/mt7615/init.c
>> > @@ -152,6 +152,12 @@ static const struct ieee80211_iface_combination if_comb[] = {
>> >               .max_interfaces = 4,
>> >               .num_different_channels = 1,
>> >               .beacon_int_infra_match = true,
>> > +             .radar_detect_widths = BIT(NL80211_CHAN_WIDTH_20_NOHT) |
>> > +                                    BIT(NL80211_CHAN_WIDTH_20) |
>> > +                                    BIT(NL80211_CHAN_WIDTH_40) |
>> > +                                    BIT(NL80211_CHAN_WIDTH_80) |
>> > +                                    BIT(NL80211_CHAN_WIDTH_160) |
>> > +                                    BIT(NL80211_CHAN_WIDTH_80P80),
>>
>> Isn't it questionable to enable these without any testing on real
>> hardware? Getting DFS to work correctly is hard so I'm very suspicious
>> about this.
>>
>> --
>> Kalle Valo
>
> Hi Kalle,
>
> unfortunately at the moment I am not able to run any tests with a real
> signal generator so I just ported the code from vendor sdk.
> I am pretty confident it works since the radar pattern detection is
> done in fw/hw so I guess it has been already tested in the vendor sdk

DFS is really tricky to get it working right, so I'm not easily
convinced :)

> but we can postpone this patch and apply just the rest of the series
> until we have some test results.

Yeah, I think it would be best to drop this patch so that DFS is not
enabled by default and apply this patch only after positive test
results.

-- 
Kalle Valo