Received-SPF: pass (google.com: domain of linux-wireless-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
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 1/4] wifi: mt76: mt7915: fix antenna selection with bad eeprom.
Date:   Thu, 10 Nov 2022 16:39:50 +0100
Message-Id: <20221110153953.22562-2-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>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

If the nss value is zero in the eeprom, set it to the max.
This eeprom fragment from a mt7915 DBDC shows the problem:

00000190: 24 24 08 00 28 00 00 15 00 00 00 00 00 00 00 00

Fixes: 51a87540232c ("wifi: mt76: mt7915: rework eeprom tx paths and streams init")
Signed-off-by: Nicolas Cavallari <nicolas.cavallari@green-communications.fr>
---
 drivers/net/wireless/mediatek/mt76/mt7915/eeprom.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/eeprom.c b/drivers/net/wireless/mediatek/mt76/mt7915/eeprom.c
index e2482c65d639..83bced0c0785 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/eeprom.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/eeprom.c
@@ -208,6 +208,8 @@ void mt7915_eeprom_parse_hw_cap(struct mt7915_dev *dev,
 			nss_max = 2;
 	}
 
+	if (!nss)
+		nss = nss_max;
 	nss = min_t(u8, min_t(u8, nss_max, nss), path);
 
 	mphy->chainmask = BIT(path) - 1;
-- 
2.38.1