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From:   Felix Fietkau <nbd@nbd.name>
To:     linux-wireless@vger.kernel.org
Subject: [PATCH] mt76: mt7615: apply calibration-free data from OTP
Date:   Wed, 21 Aug 2019 21:14:43 +0200
Message-Id: <20190821191443.36764-1-nbd@nbd.name>
Sender: linux-wireless-owner@vger.kernel.org
Precedence: bulk

MT7615 chips usually come pre-calibrated, even when used on embedded boards.
In that case, the on-flash EEPROM data needs to be merged with some data
from OTP ROM.
Run this merge if the external EEPROM data is valid and OTP has valid fields.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
 .../wireless/mediatek/mt76/mt7615/eeprom.c    | 38 +++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/eeprom.c b/drivers/net/wireless/mediatek/mt76/mt7615/eeprom.c
index dc94f52e6e8b..515bb58e19fd 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7615/eeprom.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7615/eeprom.c
@@ -154,6 +154,42 @@ int mt7615_eeprom_get_power_index(struct mt7615_dev *dev,
 	return index;
 }
 
+static void mt7615_apply_cal_free_data(struct mt7615_dev *dev)
+{
+	static const u16 ical[] = {
+		0x53, 0x54, 0x55, 0x56, 0x57, 0x5c, 0x5d, 0x62, 0x63, 0x68,
+		0x69, 0x6e, 0x6f, 0x73, 0x74, 0x78, 0x79, 0x82, 0x83, 0x87,
+		0x88, 0x8c, 0x8d, 0x91, 0x92, 0x96, 0x97, 0x9b, 0x9c, 0xa0,
+		0xa1, 0xaa, 0xab, 0xaf, 0xb0, 0xb4, 0xb5, 0xb9, 0xba, 0xf4,
+		0xf7, 0xff,
+		0x140, 0x141, 0x145, 0x146, 0x14a, 0x14b, 0x154, 0x155, 0x159,
+		0x15a, 0x15e, 0x15f, 0x163, 0x164, 0x168, 0x169, 0x16d, 0x16e,
+		0x172, 0x173, 0x17c, 0x17d, 0x181, 0x182, 0x186, 0x187, 0x18b,
+		0x18c
+	};
+	static const u16 ical_nocheck[] = {
+		0x110, 0x111, 0x112, 0x113, 0x114, 0x115, 0x116, 0x117, 0x118,
+		0x1b5, 0x1b6, 0x1b7, 0x3ac, 0x3ad, 0x3ae, 0x3af, 0x3b0, 0x3b1,
+		0x3b2
+	};
+	u8 *eeprom = dev->mt76.eeprom.data;
+	u8 *otp = dev->mt76.otp.data;
+	int i;
+
+	if (!otp)
+		return;
+
+	for (i = 0; i < ARRAY_SIZE(ical); i++)
+		if (!otp[ical[i]])
+			return;
+
+	for (i = 0; i < ARRAY_SIZE(ical); i++)
+		eeprom[ical[i]] = otp[ical[i]];
+
+	for (i = 0; i < ARRAY_SIZE(ical_nocheck); i++)
+		eeprom[ical_nocheck[i]] = otp[ical_nocheck[i]];
+}
+
 int mt7615_eeprom_init(struct mt7615_dev *dev)
 {
 	int ret;
@@ -166,6 +202,8 @@ int mt7615_eeprom_init(struct mt7615_dev *dev)
 	if (ret && dev->mt76.otp.data)
 		memcpy(dev->mt76.eeprom.data, dev->mt76.otp.data,
 		       MT7615_EEPROM_SIZE);
+	else
+		mt7615_apply_cal_free_data(dev);
 
 	mt7615_eeprom_parse_hw_cap(dev);
 	memcpy(dev->mt76.macaddr, dev->mt76.eeprom.data + MT_EE_MAC_ADDR,
-- 
2.17.0