I'm using last openwrt snapshot. Also tried 19.07 and 21.01
Here is "dmesg |grep ath" output:
[ 2077.290831] [<80033a44>] warn_slowpath_fmt+0x8c/0xac
[ 2207.415591] usb 2-1: ath9k_htc: Firmware ath9k_htc/htc_9271-1.4.0.fw requested
[ 2207.421703] usbcore: registered new interface driver ath9k_htc
[ 2207.707472] usb 2-1: ath9k_htc: Transferred FW: ath9k_htc/htc_9271-1.4.0.fw, size: 51008
[ 2207.959395] ath9k_htc 2-1:1.0: ath9k_htc: HTC initialized with 33 credits
[ 2208.972039] ath: phy2: Failed to read SREV register
[ 2208.972094] ath: phy2: Could not read hardware revisions
[ 2208.975566] ath: phy2: Unable to initialize hardware; initialization status: -122
[ 2208.988964] ath: phy2: Unable to initialize hardware; initialization status: -122
[ 2209.000377] ath9k_htc: Failed to initialize the device
[ 2209.005099] usb 2-1: ath9k_htc: USB layer deinitialized
How can fix this ?