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From:   Nicolas Cavallari <nicolas.cavallari@green-communications.fr>
To:     linux-wireless@vger.kernel.org
Cc:     Felix Fietkau <nbd@nbd.name>,
        Lorenzo Bianconi <lorenzo@kernel.org>,
        Ryder Lee <ryder.lee@mediatek.com>,
        Shayne Chen <shayne.chen@mediatek.com>,
        Sean Wang <sean.wang@mediatek.com>
Subject: [PATCH 2/4] wifi: mt76: mt7915: Fix chainmask calculation on mt7915 DBDC
Date:   Thu, 10 Nov 2022 16:39:51 +0100
Message-Id: <20221110153953.22562-3-nicolas.cavallari@green-communications.fr>
In-Reply-To: <20221110153953.22562-1-nicolas.cavallari@green-communications.fr>
References: <20221110153953.22562-1-nicolas.cavallari@green-communications.fr>
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mt7915 does not have a per-band number of chains unlike the other chips,
it only has a total number of chains.  Yet the current code would
consider the total number as a per-band number.

For example, it would report that a 2x2 + 2x2 DBDC card have 4 chains on
each band and set chainmask to 0b1111 for the first interface and
0b11110000 for the second.

Fixes: 99ad32a4ca3a ("mt76: mt7915: add support for MT7986")
Signed-off-by: Nicolas Cavallari <nicolas.cavallari@green-communications.fr>
---
 drivers/net/wireless/mediatek/mt76/mt7915/eeprom.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/eeprom.c b/drivers/net/wireless/mediatek/mt76/mt7915/eeprom.c
index 83bced0c0785..8bb971018a1e 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/eeprom.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/eeprom.c
@@ -194,6 +194,7 @@ void mt7915_eeprom_parse_hw_cap(struct mt7915_dev *dev,
 	nss = path;
 	if (dev->dbdc_support) {
 		if (is_mt7915(&dev->mt76)) {
+			path = path / 2;
 			nss = FIELD_GET(MT_EE_WIFI_CONF3_TX_PATH_B0,
 					eeprom[MT_EE_WIFI_CONF + 3]);
 			if (phy->band_idx)
-- 
2.38.1