Question about TX power

[Alexander Wilhelm]

Hello devs,

I'd like to understand how TX power setting works on ath11k devices. For example
when I'm using channel 36 for ETSI based regulatory domain, I can set up to 23
dBm. But then I get only 20 dBm as a result. On different channels and/or
regulatory domains I get different reductions. I tried to follow the source
code. As far as I understood is that 'ath11k_mac_txpower_recalc' sets the
correct values and 'ath11k_mac_op_get_txpower' return the different one.

My question is where this reduction offset is encoded. Is it in the module's
firmware or is it part of the boardfile? Thank you in advance.


Best regards
Alexander Wilhelm