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From:   Denis Kalashnikov <denis281089@gmail.com>
Date:   Fri, 27 Dec 2019 10:18:05 +0300
Message-ID: <CAKoLU8M+QU-96vnfet-759nnXyxxJmsf1Csba4FgNas8ZVOnOQ@mail.gmail.com>
Subject: [PATCH 1/1] ath9k: fix firmware bug in some of Mikrotik R11e-2HPnD cards
To:     linux-wireless@vger.kernel.org
Cc:     kvalo@codeaurora.org
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Sender: linux-wireless-owner@vger.kernel.org
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Some of the Mikrotik R11e-2HPnD cards have EEPROM where is
flashed that a card has 3 chains, but actually all this cards
have only 2. This leads ath9k to write periodically into the logs:
'ath: phy0: Unable to reset channel, reset status -5' and
stations don't see that AP.

Mikrotik R11e-2HPnD is based on AR9582 chip.

Signed-off-by: Denis Kalashnikov <denis281089@gmail.com>
---
 drivers/net/wireless/ath/ath9k/ar9003_eeprom.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/net/wireless/ath/ath9k/ar9003_eeprom.c
b/drivers/net/wireless/ath/ath9k/ar9003_eeprom.c
index b4885a700296..554a81400648 100644
--- a/drivers/net/wireless/ath/ath9k/ar9003_eeprom.c
+++ b/drivers/net/wireless/ath/ath9k/ar9003_eeprom.c
@@ -3373,6 +3373,15 @@ static int
ar9300_eeprom_restore_internal(struct ath_hw *ah,
                cptr -= (COMP_HDR_LEN + osize + COMP_CKSUM_LEN);
        }

+       /**
+        * Fix firmware bug of some Mikrotik R11e-2HPnD cards (based on AR9582)
+        * that claim that they have 3 chains, but actually have only 2.
+        */
+       if (AR_SREV_9580(ah)) {
+               eep = (struct ar9300_eeprom *)mptr;
+               eep->baseEepHeader.txrxMask &= 0x33;
+       }
+
        kfree(word);
        return cptr;

-- 
2.23.0