wcn7850 issues

[Baochen Qiang]

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.

> David
> 
> 
>