mt7981: rate control issue with pre-cal enabled

[castiel652]

Device: Zyxel NWA50AX Pro (mt7981)

Issue

Channel 149~165

With precal enabled the rate control seems unable to go above MCS7 no matter VHT or HE.

With precal disabled through DTS there's no problem at all.

Clients all supports up to MCS11 verified by checking /sys/kernel/debug/ieee80211/phy1/netdev:phy1-ap0/stations

Config

config wifi-device 'radio1'
        option type 'mac80211'
        option path 'platform/soc/18000000.wifi+1'
        option band '5g'
        option channel '149'
        option htmode 'HE80'
        option country 'TW'
        option cell_density '0'
        option hostapd_options 'he_twt_responder=0'

config wifi-iface 'default_radio1'
        option device 'radio1'
        option network 'lan'
        option mode 'ap'
        option ssid 'Trash GGGGG'
        option encryption 'sae'
        option isolate '1'
        option key ''
        option ocv '0'
        option dtim_period '3'

iwinfo output (wiht precal)

First one is AX210 through one wall.
Second one is iPhone 16 Pro in the same room with the AP.

root@NWA50AXPro:/sys/kernel/debug/ieee80211/phy1/mt76# iwinfo phy1-ap0 a
XX:XX:XX:XX:XX:XX  -68 dBm / -92 dBm (SNR 24)  10 ms ago
        RX: 720.6 MBit/s, HE-MCS 7, 80MHz, HE-NSS 2, HE-GI 0, HE-DCM 0      6612 Pkts.
        TX: 720.6 MBit/s, HE-MCS 7, 80MHz, HE-NSS 2, HE-GI 0, HE-DCM 0     14675 Pkts.
        expected throughput: 623.9 MBit/s

XX:XX:XX:XX:XX:XX  -50 dBm / -92 dBm (SNR 42)  6590 ms ago
        RX: 1134.2 MBit/s, HE-MCS 11, 80MHz, HE-NSS 2, HE-GI 1, HE-DCM 0       145 Pkts.
        TX: 720.6 MBit/s, HE-MCS 7, 80MHz, HE-NSS 2, HE-GI 0, HE-DCM 0        36 Pkts.

iwinfo output (wihtout precal by removing NVMEM cell in DTS)

root@NWA50AXPro:~# iwinfo phy1-ap0 a
XX:XX:XX:XX:XX:XX  -66 dBm / -92 dBm (SNR 26)  20 ms ago
        RX: 864.8 MBit/s, HE-MCS 8, 80MHz, HE-NSS 2, HE-GI 0, HE-DCM 0      7547 Pkts.
        TX: 960.7 MBit/s, HE-MCS 9, 80MHz, HE-NSS 2, HE-GI 0, HE-DCM 0     14893 Pkts.
        expected throughput: 814.9 MBit/s

XX:XX:XX:XX:XX:XX  -55 dBm / -92 dBm (SNR 37)  1630 ms ago
        RX: 1134.2 MBit/s, HE-MCS 11, 80MHz, HE-NSS 2, HE-GI 1, HE-DCM 0      1010 Pkts.
        TX: 1200.9 MBit/s, HE-MCS 11, 80MHz, HE-NSS 2, HE-GI 0, HE-DCM 0      2838 Pkts.
        expected throughput: 1002.2 MBit/s