Hi
Have been using OpenWRT on Netgear R6220 from 18.06. Post upgrading to 21.02 I faced issues of looking 2.4G WiFi network and it used to reappear after a power cycle. Since yesterday I couldn't get back the 2.4G WiFi even after multiple cycles and upgrading to 21.02.1 release as well. Below are some logs which I captured up to my knowledge.
root@bkj-gateway:~# dmesg | grep -e pci
[ 2.352307] mt7621-pci 1e140000.pcie: Parsing DT failed
[ 2.584973] rt2880-pinmux pinctrl: pcie is already enabled
[ 2.596067] mt7621-pci-phy 1e149000.pcie-phy: PHY for 0xbe149000 (dual port = 1)
[ 2.611011] mt7621-pci-phy 1e14a000.pcie-phy: PHY for 0xbe14a000 (dual port = 0)
[ 2.725555] mt7621-pci-phy 1e149000.pcie-phy: Xtal is 40MHz
[ 2.736675] mt7621-pci-phy 1e14a000.pcie-phy: Xtal is 40MHz
[ 2.847479] mt7621-pci 1e140000.pcie: pcie1 no card, disable it (RST & CLK)
[ 2.861348] mt7621-pci 1e140000.pcie: pcie2 no card, disable it (RST & CLK)
[ 2.875219] mt7621-pci 1e140000.pcie: PCIE0 enabled
[ 2.884941] mt7621-pci 1e140000.pcie: PCI coherence region base: 0x60000000, mask/settings: 0xf0000002
[ 2.903656] mt7621-pci 1e140000.pcie: PCI host bridge to bus 0000:00
[ 2.916336] pci_bus 0000:00: root bus resource [io 0x1e160000-0x1e16ffff]
[ 2.930046] pci_bus 0000:00: root bus resource [mem 0x60000000-0x6fffffff]
[ 2.943741] pci_bus 0000:00: root bus resource [bus 00-ff]
[ 2.954713] pci 0000:00:00.0: [0e8d:0801] type 01 class 0x060400
[ 2.966711] pci 0000:00:00.0: reg 0x10: [mem 0x00000000-0x7fffffff]
[ 2.979205] pci 0000:00:00.0: reg 0x14: [mem 0x60200000-0x6020ffff]
[ 2.991778] pci 0000:00:00.0: supports D1
[ 2.999780] pci 0000:00:00.0: PME# supported from D0 D1 D3hot
[ 3.012999] pci 0000:01:00.0: [14c3:7662] type 00 class 0x028000
[ 3.025033] pci 0000:01:00.0: reg 0x10: [mem 0x00000000-0x000fffff 64bit]
[ 3.038601] pci 0000:01:00.0: reg 0x30: [mem 0x00000000-0x0000ffff pref]
[ 3.052056] pci 0000:01:00.0: PME# supported from D0 D3hot D3cold
[ 3.065644] pci 0000:00:00.0: PCI bridge to [bus 01-ff]
[ 3.076068] pci 0000:00:00.0: bridge window [io 0x0000-0x0fff]
[ 3.088212] pci 0000:00:00.0: bridge window [mem 0x60000000-0x600fffff]
[ 3.101736] pci 0000:00:00.0: bridge window [mem 0x60100000-0x601fffff pref]
[ 3.116129] pci_bus 0000:01: busn_res: [bus 01-ff] end is updated to 01
[ 3.129347] pci 0000:00:00.0: BAR 0: no space for [mem size 0x80000000]
[ 3.142532] pci 0000:00:00.0: BAR 0: failed to assign [mem size 0x80000000]
[ 3.156405] pci 0000:00:00.0: BAR 8: assigned [mem 0x60000000-0x600fffff]
[ 3.169933] pci 0000:00:00.0: BAR 9: assigned [mem 0x60100000-0x601fffff pref]
[ 3.184328] pci 0000:00:00.0: BAR 1: assigned [mem 0x60200000-0x6020ffff]
[ 3.197857] pci 0000:00:00.0: BAR 7: assigned [io 0x1e160000-0x1e160fff]
[ 3.211390] pci 0000:01:00.0: BAR 0: assigned [mem 0x60000000-0x600fffff 64bit]
[ 3.225968] pci 0000:01:00.0: BAR 6: assigned [mem 0x60100000-0x6010ffff pref]
[ 3.240368] pci 0000:00:00.0: PCI bridge to [bus 01]
[ 3.250259] pci 0000:00:00.0: bridge window [io 0x1e160000-0x1e160fff]
[ 3.263802] pci 0000:00:00.0: bridge window [mem 0x60000000-0x600fffff]
[ 3.277324] pci 0000:00:00.0: bridge window [mem 0x60100000-0x601fffff pref]
[ 13.624156] mt7621-pci 1e140000.pcie: bus=1 slot=0 irq=19
[ 13.634988] pci 0000:00:00.0: enabling device (0006 -> 0007)
root@bkj-gateway:~# dmesg | grep -e mt76x2
[ 13.646286] mt76x2e 0000:01:00.0: enabling device (0000 -> 0002)
[ 13.658523] mt76x2e 0000:01:00.0: ASIC revision: 76120044
[ 14.072456] mt76x2e 0000:01:00.0: ROM patch build: 20141115060606a
[ 14.089665] mt76x2e 0000:01:00.0: Firmware Version: 0.0.00
[ 14.100626] mt76x2e 0000:01:00.0: Build: 1
[ 14.108787] mt76x2e 0000:01:00.0: Build Time: 201507311614____
[ 14.135823] mt76x2e 0000:01:00.0: Firmware running!
Error in logcat related to radio0:
Sun Nov 7 10:00:33 2021 daemon.notice netifd: radio0 (1989): Could not find PHY for device 'radio0'
Sun Nov 7 10:00:33 2021 daemon.notice netifd: radio0 (2101): WARNING: Variable 'data' does not exist or is not an array/object
Sun Nov 7 10:00:33 2021 daemon.notice netifd: radio0 (2101): Bug: PHY is undefined for device 'radio0'
root@bkj-gateway:~# lspci
00:00.0 PCI bridge: Device 0e8d:0801 (rev 01)
01:00.0 Network controller: MEDIATEK Corp. MT7662E 802.11ac PCI Express Wireless Network Adapter
root@bkj-gateway:~# iwinfo
wlan0 ESSID: "BKJ_5G"
Access Point: 10:DA:43:DC:A3:A4
Mode: Master Channel: 60 (5.300 GHz)
Center Channel 1: 58 2: unknown
Tx-Power: 24 dBm Link Quality: unknown/70
Signal: unknown Noise: unknown
Bit Rate: unknown
Encryption: mixed WPA2/WPA3 PSK/SAE (CCMP)
Type: nl80211 HW Mode(s): 802.11nac
Hardware: 14C3:7662 14C3:7662 [MediaTek MT76x2E]
TX power offset: none
Frequency offset: none
Supports VAPs: yes PHY name: phy0
/etc/config/wireless
config wifi-device 'radio0'
option type 'mac80211'
option path '1e140000.pcie/pci0000:00/0000:00:01.0/0000:02:00.0'
option cell_density '0'
option country 'IN'
option beacon_int '1000'
option hwmode '11a'
option distance '50'
config wifi-device 'radio1'
option type 'mac80211'
option hwmode '11a'
option path '1e140000.pcie/pci0000:00/0000:00:00.0/0000:01:00.0'
option htmode 'VHT80'
option country 'IN'
option cell_density '2'
option channel '60'