wcn7850 issues

[Baochen Qiang]

On 9/2/2024 2:03 PM, david Atkins wrote:
>> On 9/1/2024 3:39 PM, david Atkins wrote:
>>>> On 8/30/2024 1:55 PM, david Atkins wrote:
>>>>> Any updates on this? We still cannot register a Hamilton card with
>>>>> ath12k driver with a 4x4 AP
>>>>
>>>> The 'Basic EHT-MCS And Nss Set' indicate the minimal requirement, not
>>>> the max, see spec:
>>>>
>>>> 35.15 EHT BSS operation
>>>> 35.15.1 Basic EHT BSS operation
>>>>
>>>> An EHT STA has dot11EHTOptionImplemented equal to true.
>>>> The basic EHT-MCS and NSS set is the set of <EHT-MCS, NSS> tuples
>>>> that are supported by all EHT STAs that are members of an EHT BSS. ...
>>>>
>>>> An EHT STA shall not attempt to join (MLME-JOIN.request primitive) a
>>>> BSS unless it supports (i.e., is able to both transmit and receive
>>>> using) all of the <EHT-MCS, NSS> tuples in the basic EHT-MCS and NSS set.
>>>
>>> I'm unsure what's missing here, this is the beacon data relating to
>>> EHT MCS/NSS
>>>
>>>             Supported EHT-MCS and NSS Set
>>>                 EHT-MCS Map (BW <= 80MHz): 0x444444
>>>                     .... .... .... .... .... 0100 = Rx Max Nss That Supports EHT-MCS 0-9:
>> 4
>>>                     .... .... .... .... 0100 .... = Tx Max Nss That Supports EHT-MCS 0-9: 4
>>>                     .... .... .... 0100 .... .... = Rx Max Nss That Supports EHT-MCS 10-
>> 11: 4
>>>                     .... .... 0100 .... .... .... = Tx Max Nss That Supports EHT-MCS 10-
>> 11: 4
>>>                     .... 0100 .... .... .... .... = Rx Max Nss That Supports EHT-MCS 12-
>> 13: 4
>>>                     0100 .... .... .... .... .... = Tx Max Nss That Supports EHT-MCS 12-
>> 13: 4
>>>         Ext Tag: EHT Operation (802.11be D3.0)
>>>             Ext Tag length: 8 (Tag len: 9)
>>>             Ext Tag Number: EHT Operation (802.11be D3.0) (106)
>>>             EHT Operation Parameters: 0x01, EHT Operation Information Present
>>>                 .... ...1 = EHT Operation Information Present: True
>>>                 .... ..0. = Disabled Subchannel Bitmap Present: False
>>>                 .... .0.. = EHT Default PE Duration: False
>>>                 .... 0... = Group Addressed BU Indication Limit: False
>>>                 ..00 .... = Group Addressed BU Indication Exponent: 0
>>>                 00.. .... = Reserved: 0x0
>>>             Basic EHT-MCS And Nss Set: 0x44444444
>>>             Control: 0x02, Channel Width: 80 MHz EHT BSS bandwidth
>>>                 .... .010 = Channel Width: 80 MHz EHT BSS bandwidth (2)
>>>                 0000 0... = Reserved: 0x00
>>>
>>> Are you saying the ath12k driver does not support these features? If not can
>> you clarify the issue so I can raise with the AP team.
>>>
>> ath12k/WCN7850 supports EHT, but with NSS only 2. Here the AP requires NSS
>> to be no less than 4, that is why EHT connection was disabled.
> 
> Which field is requiring NSS of 4, I'm only seeing a maximum of 4, the Qualcomm windows driver will connect to the same AP, we had assumed that that ath12k would do the same.
Basic EHT-MCS And Nss Set: 0x44444444

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