Dynamic channel Access

Jose Antonio Delgado Alfonso jose.delgado at aoifes.com
Thu Mar 26 02:34:22 PDT 2015

On 26/03/15 07:30, Michal Kazior wrote:
> On 25 March 2015 at 16:34, Jose Antonio Delgado Alfonso
> <jose.delgado at aoifes.com> wrote:
>> Hi all,
>> I would like to ask Qualcomm's collaborators about this topic.
>> We are trying to certify a AP product which uses QCA988x radio module.
>> We are using the ath10k driver (kernel v3.17.8) and firmware from Ben
>> Greear. We are trying to pass the Dynamic Channel test, which consists
>> in setting the radio at 80MHz and, at the same time, setting other
>> signal in the secondary channel. So far, the radio module does not
>> reduce the bandwidth and remains transmitting at 80MHz.
>> Please, Does someone know if Dynamic Channel Access is really supported
>> by ath10k driver in newest kernel versions?
> You haven't really defined what kind of "other signal" you set up.
> ath10k sets/enables dynamic_bw wmi parameter in ath10k_start(). From
> what I know dynamic_bw does enable fw/hw to downgrade traffic from
> 80MHz to 40MHz in case there's other 802.11 traffic on the subband
> happening at least on 10.1.467 - not sure about non-802.11 traffic. I
> suppose newer firmware revisions do that too. I'm not sure about
> 999.999.0.636 though.
> Michał
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I tested with other AP and also with a signal generator emitting a flat
noise of 20 MHz continuously.

I will check how function ath10k_start is implemented in my kernel tree
and if that parameter is really enabled on my setup.


Jose A. Delgado

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