ath9k: Resting due to beacon stuck at 5GHz at clean environment

ath9k is continuously resting because of beacon stuck at 5GHz.
I am working on a board with AR9462 module.
I checked the environment noise levels, my test environment is clean
and there is no interference.

While checking solution for the issue, I found that if comment the
last part of =E2=80=9Cint ath9k_hw_loadnf(struct ath_hw *ah, struct
ath9k_channel *chan)=E2=80=9D which is given below, then driver works prope=
rly
also. But if I remove this part, I expect that driver should not able
to perform noise floor calibration properly. I found a related patch,
https://patchwork.kernel.org/patch/8215351/, but it is already applied
to driver.

Also if I increase the minimum CCA power threshold values from the
initvals (in ar9462_2p0_initvals.h), driver works properly. But these
values are above the allowed values considering ETSI compliance:
https://www.spinics.net/lists/linux-wireless/msg118665.html

Many thanks in advance for any help.

       /*
        * Restore maxCCAPower register parameter again so that we're not ca=
pped
        * by the median we just loaded.  This will be initial (and max) val=
ue
        * of next noise floor calibration the baseband does.
        */
       ENABLE_REG_RMW_BUFFER(ah);
       for (i =3D 0; i < NUM_NF_READINGS; i++) {
              if (chainmask & (1 << i)) {
                     if ((i >=3D AR5416_MAX_CHAINS) && !IS_CHAN_HT40(chan))
                            continue;

                     REG_RMW(ah, ah->nf_regs[i],
                                   (((u32) (-50) << 1) & 0x1ff), 0x1ff);
              }
       }
       REG_RMW_BUFFER_FLUSH(ah);

Regards,
Cevahir