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From:   Lorenzo Bianconi <lorenzo@kernel.org>
To:     nbd@nbd.name
Cc:     lorenzo.bianconi@redhat.com, linux-wireless@vger.kernel.org,
        ryder.lee@mediatek.com, royluo@google.com
Subject: [PATCH] mt76: mt7615: select wifi band according to eeprom
Date:   Fri, 17 May 2019 23:32:56 +0200
Message-Id: <38aa977df45a92f60d78d9cb7e575289ccbaeef6.1558127930.git.lorenzo@kernel.org>
In-Reply-To: <cover.1558127930.git.lorenzo@kernel.org>
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Select supported band according to the value read from
eeprom mtd/otp partition

Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
---
 .../wireless/mediatek/mt76/mt7615/eeprom.c    | 24 ++++++++++++++++---
 .../wireless/mediatek/mt76/mt7615/eeprom.h    |  9 +++++++
 2 files changed, 30 insertions(+), 3 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/eeprom.c b/drivers/net/wireless/mediatek/mt76/mt7615/eeprom.c
index 1712f66520a8..714590878d65 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7615/eeprom.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7615/eeprom.c
@@ -90,6 +90,26 @@ static int mt7615_check_eeprom(struct mt76_dev *dev)
 	}
 }
 
+static void mt7615_eeprom_parse_hw_cap(struct mt7615_dev *dev)
+{
+	u8 val, *eeprom = dev->mt76.eeprom.data;
+
+	val = FIELD_GET(MT_EE_NIC_WIFI_CONF_BAND_SEL,
+			eeprom[MT_EE_WIFI_CONF]);
+	switch (val) {
+	case MT_EE_5GHZ:
+		dev->mt76.cap.has_5ghz = true;
+		break;
+	case MT_EE_2GHZ:
+		dev->mt76.cap.has_2ghz = true;
+		break;
+	default:
+		dev->mt76.cap.has_2ghz = true;
+		dev->mt76.cap.has_5ghz = true;
+		break;
+	}
+}
+
 int mt7615_eeprom_init(struct mt7615_dev *dev)
 {
 	int ret;
@@ -103,9 +123,7 @@ int mt7615_eeprom_init(struct mt7615_dev *dev)
 		memcpy(dev->mt76.eeprom.data, dev->mt76.otp.data,
 		       MT7615_EEPROM_SIZE);
 
-	dev->mt76.cap.has_2ghz = true;
-	dev->mt76.cap.has_5ghz = true;
-
+	mt7615_eeprom_parse_hw_cap(dev);
 	memcpy(dev->mt76.macaddr, dev->mt76.eeprom.data + MT_EE_MAC_ADDR,
 	       ETH_ALEN);
 
diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/eeprom.h b/drivers/net/wireless/mediatek/mt76/mt7615/eeprom.h
index a4cf16688171..b422e395d6ee 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7615/eeprom.h
+++ b/drivers/net/wireless/mediatek/mt76/mt7615/eeprom.h
@@ -11,8 +11,17 @@ enum mt7615_eeprom_field {
 	MT_EE_VERSION =				0x002,
 	MT_EE_MAC_ADDR =			0x004,
 	MT_EE_NIC_CONF_0 =			0x034,
+	MT_EE_WIFI_CONF =			0x03e,
 
 	__MT_EE_MAX =				0x3bf
 };
 
+#define MT_EE_NIC_WIFI_CONF_BAND_SEL		GENMASK(5, 4)
+enum mt7615_eeprom_band {
+	MT_EE_DUAL_BAND,
+	MT_EE_5GHZ,
+	MT_EE_2GHZ,
+	MT_EE_DBDC,
+};
+
 #endif
-- 
2.20.1