drivers/net/wireless/mediatek/mt76/mt7915/eeprom.c - linux - Git at Google

 // SPDX-License-Identifier: ISC
 /* Copyright (C) 2020 MediaTek Inc. */

 #include <linux/firmware.h>
 #include "mt7915.h"
 #include "eeprom.h"

 static int mt7915_eeprom_load_precal(struct mt7915_dev *dev)
 {
 	struct mt76_dev *mdev = &dev->mt76;
 	u8 *eeprom = mdev->eeprom.data;
 	u32 val = eeprom[MT_EE_DO_PRE_CAL];
 	u32 offs;
 	int ret;

 	if (!dev->flash_mode)
 		return 0;

 	if (val != (MT_EE_WIFI_CAL_DPD | MT_EE_WIFI_CAL_GROUP))
 		return 0;

 	val = MT_EE_CAL_GROUP_SIZE + MT_EE_CAL_DPD_SIZE;
 	dev->cal = devm_kzalloc(mdev->dev, val, GFP_KERNEL);
 	if (!dev->cal)
 		return -ENOMEM;

 	offs = is_mt7915(&dev->mt76) ? MT_EE_PRECAL : MT_EE_PRECAL_V2;

 	ret = mt76_get_of_data_from_mtd(mdev, dev->cal, offs, val);
 	if (!ret)
 		return ret;

 	return mt76_get_of_data_from_nvmem(mdev, dev->cal, "precal", val);
 }

 static int mt7915_check_eeprom(struct mt7915_dev *dev)
 {
 	u8 *eeprom = dev->mt76.eeprom.data;
 	u16 val = get_unaligned_le16(eeprom);

 #define CHECK_EEPROM_ERR(match)	(match ? 0 : -EINVAL)
 	switch (val) {
 	case 0x7915:
 		return CHECK_EEPROM_ERR(is_mt7915(&dev->mt76));
 	case 0x7916:
 		return CHECK_EEPROM_ERR(is_mt7916(&dev->mt76));
 	case 0x7981:
 		return CHECK_EEPROM_ERR(is_mt7981(&dev->mt76));
 	case 0x7986:
 		return CHECK_EEPROM_ERR(is_mt7986(&dev->mt76));
 	default:
 		return -EINVAL;
 	}
 }

 static char *mt7915_eeprom_name(struct mt7915_dev *dev)
 {
 	switch (mt76_chip(&dev->mt76)) {
 	case 0x7915:
 		return dev->dbdc_support ?
 		       MT7915_EEPROM_DEFAULT_DBDC : MT7915_EEPROM_DEFAULT;
 	case 0x7981:
 		/* mt7981 only supports mt7976 and only in DBDC mode */
 		return MT7981_EEPROM_MT7976_DEFAULT_DBDC;
 	case 0x7986:
 		switch (mt7915_check_adie(dev, true)) {
 		case MT7976_ONE_ADIE_DBDC:
 			return MT7986_EEPROM_MT7976_DEFAULT_DBDC;
 		case MT7975_ONE_ADIE:
 			return MT7986_EEPROM_MT7975_DEFAULT;
 		case MT7976_ONE_ADIE:
 			return MT7986_EEPROM_MT7976_DEFAULT;
 		case MT7975_DUAL_ADIE:
 			return MT7986_EEPROM_MT7975_DUAL_DEFAULT;
 		case MT7976_DUAL_ADIE:
 			return MT7986_EEPROM_MT7976_DUAL_DEFAULT;
 		default:
 			break;
 		}
 		return NULL;
 	default:
 		return MT7916_EEPROM_DEFAULT;
 	}
 }

 static int
 mt7915_eeprom_load_default(struct mt7915_dev *dev)
 {
 	u8 *eeprom = dev->mt76.eeprom.data;
 	const struct firmware *fw = NULL;
 	int ret;

 	ret = request_firmware(&fw, mt7915_eeprom_name(dev), dev->mt76.dev);
 	if (ret)
 		return ret;

 	if (!fw || !fw->data) {
 		dev_err(dev->mt76.dev, "Invalid default bin\n");
 		ret = -EINVAL;
 		goto out;
 	}

 	memcpy(eeprom, fw->data, mt7915_eeprom_size(dev));
 	dev->flash_mode = true;

 out:
 	release_firmware(fw);

 	return ret;
 }

 static int mt7915_eeprom_load(struct mt7915_dev *dev)
 {
 	int ret;
 	u16 eeprom_size = mt7915_eeprom_size(dev);

 	ret = mt76_eeprom_init(&dev->mt76, eeprom_size);
 	if (ret < 0)
 		return ret;

 	if (ret) {
 		dev->flash_mode = true;
 	} else {
 		u8 free_block_num;
 		u32 block_num, i;
 		u32 eeprom_blk_size = MT7915_EEPROM_BLOCK_SIZE;

 		ret = mt7915_mcu_get_eeprom_free_block(dev, &free_block_num);
 		if (ret < 0)
 			return ret;

 		/* efuse info isn't enough */
 		if (free_block_num >= 29)
 			return -EINVAL;

 		/* read eeprom data from efuse */
 		block_num = DIV_ROUND_UP(eeprom_size, eeprom_blk_size);
 		for (i = 0; i < block_num; i++) {
 			ret = mt7915_mcu_get_eeprom(dev, i * eeprom_blk_size);
 			if (ret < 0)
 				return ret;
 		}
 	}

 	return mt7915_check_eeprom(dev);
 }

 static void mt7915_eeprom_parse_band_config(struct mt7915_phy *phy)
 {
 	struct mt7915_dev *dev = phy->dev;
 	u8 *eeprom = dev->mt76.eeprom.data;
 	u8 band = phy->mt76->band_idx;
 	u32 val;

 	val = eeprom[MT_EE_WIFI_CONF + band];
 	val = FIELD_GET(MT_EE_WIFI_CONF0_BAND_SEL, val);

 	if (!is_mt7915(&dev->mt76)) {
 		switch (val) {
 		case MT_EE_V2_BAND_SEL_5GHZ:
 			phy->mt76->cap.has_5ghz = true;
 			return;
 		case MT_EE_V2_BAND_SEL_6GHZ:
 			phy->mt76->cap.has_6ghz = true;
 			return;
 		case MT_EE_V2_BAND_SEL_5GHZ_6GHZ:
 			phy->mt76->cap.has_5ghz = true;
 			phy->mt76->cap.has_6ghz = true;
 			return;
 		default:
 			phy->mt76->cap.has_2ghz = true;
 			return;
 		}
 	} else if (val == MT_EE_BAND_SEL_DEFAULT && dev->dbdc_support) {
 		val = band ? MT_EE_BAND_SEL_5GHZ : MT_EE_BAND_SEL_2GHZ;
 	}

 	switch (val) {
 	case MT_EE_BAND_SEL_5GHZ:
 		phy->mt76->cap.has_5ghz = true;
 		break;
 	case MT_EE_BAND_SEL_2GHZ:
 		phy->mt76->cap.has_2ghz = true;
 		break;
 	default:
 		phy->mt76->cap.has_2ghz = true;
 		phy->mt76->cap.has_5ghz = true;
 		break;
 	}
 }

 void mt7915_eeprom_parse_hw_cap(struct mt7915_dev *dev,
 				struct mt7915_phy *phy)
 {
 	u8 path, nss, nss_max = 4, *eeprom = dev->mt76.eeprom.data;
 	struct mt76_phy *mphy = phy->mt76;
 	u8 band = phy->mt76->band_idx;

 	mt7915_eeprom_parse_band_config(phy);

 	/* read tx/rx path from eeprom */
 	if (is_mt7915(&dev->mt76)) {
 		path = FIELD_GET(MT_EE_WIFI_CONF0_TX_PATH,
 				 eeprom[MT_EE_WIFI_CONF]);
 	} else {
 		path = FIELD_GET(MT_EE_WIFI_CONF0_TX_PATH,
 				 eeprom[MT_EE_WIFI_CONF + band]);
 	}

 	if (!path || path > 4)
 		path = 4;

 	/* read tx/rx stream */
 	nss = path;
 	if (dev->dbdc_support) {
 		if (is_mt7915(&dev->mt76)) {
 			path = min_t(u8, path, 2);
 			nss = FIELD_GET(MT_EE_WIFI_CONF3_TX_PATH_B0,
 					eeprom[MT_EE_WIFI_CONF + 3]);
 			if (band)
 				nss = FIELD_GET(MT_EE_WIFI_CONF3_TX_PATH_B1,
 						eeprom[MT_EE_WIFI_CONF + 3]);
 		} else {
 			nss = FIELD_GET(MT_EE_WIFI_CONF_STREAM_NUM,
 					eeprom[MT_EE_WIFI_CONF + 2 + band]);
 		}

 		if (!is_mt798x(&dev->mt76))
 			nss_max = 2;
 	}

 	if (!nss)
 		nss = nss_max;
 	nss = min_t(u8, min_t(u8, nss_max, nss), path);

 	mphy->chainmask = BIT(path) - 1;
 	if (band)
 		mphy->chainmask <<= dev->chainshift;
 	mphy->antenna_mask = BIT(nss) - 1;
 	dev->chainmask |= mphy->chainmask;
 	dev->chainshift = hweight8(dev->mphy.chainmask);
 }

 int mt7915_eeprom_init(struct mt7915_dev *dev)
 {
 	int ret;

 	ret = mt7915_eeprom_load(dev);
 	if (ret < 0) {
 		if (ret != -EINVAL)
 			return ret;

 		dev_warn(dev->mt76.dev, "eeprom load fail, use default bin\n");
 		ret = mt7915_eeprom_load_default(dev);
 		if (ret)
 			return ret;
 	}

 	ret = mt7915_eeprom_load_precal(dev);
 	if (ret)
 		return ret;

 	mt7915_eeprom_parse_hw_cap(dev, &dev->phy);
 	memcpy(dev->mphy.macaddr, dev->mt76.eeprom.data + MT_EE_MAC_ADDR,
 	       ETH_ALEN);

 	mt76_eeprom_override(&dev->mphy);

 	return 0;
 }

 int mt7915_eeprom_get_target_power(struct mt7915_dev *dev,
 				   struct ieee80211_channel *chan,
 				   u8 chain_idx)
 {
 	u8 *eeprom = dev->mt76.eeprom.data;
 	int index, target_power;
 	bool tssi_on, is_7976;

 	if (chain_idx > 3)
 		return -EINVAL;

 	tssi_on = mt7915_tssi_enabled(dev, chan->band);
 	is_7976 = mt7915_check_adie(dev, false) || is_mt7916(&dev->mt76);

 	if (chan->band == NL80211_BAND_2GHZ) {
 		if (is_7976) {
 			index = MT_EE_TX0_POWER_2G_V2 + chain_idx;
 			target_power = eeprom[index];
 		} else {
 			index = MT_EE_TX0_POWER_2G + chain_idx * 3;
 			target_power = eeprom[index];

 			if (!tssi_on)
 				target_power += eeprom[index + 1];
 		}
 	} else if (chan->band == NL80211_BAND_5GHZ) {
 		int group = mt7915_get_channel_group_5g(chan->hw_value, is_7976);

 		if (is_7976) {
 			index = MT_EE_TX0_POWER_5G_V2 + chain_idx * 5;
 			target_power = eeprom[index + group];
 		} else {
 			index = MT_EE_TX0_POWER_5G + chain_idx * 12;
 			target_power = eeprom[index + group];

 			if (!tssi_on)
 				target_power += eeprom[index + 8];
 		}
 	} else {
 		int group = mt7915_get_channel_group_6g(chan->hw_value);

 		index = MT_EE_TX0_POWER_6G_V2 + chain_idx * 8;
 		target_power = is_7976 ? eeprom[index + group] : 0;
 	}

 	return target_power;
 }

 s8 mt7915_eeprom_get_power_delta(struct mt7915_dev *dev, int band)
 {
 	u8 *eeprom = dev->mt76.eeprom.data;
 	u32 val, offs;
 	s8 delta;
 	bool is_7976 = mt7915_check_adie(dev, false) || is_mt7916(&dev->mt76);

 	if (band == NL80211_BAND_2GHZ)
 		offs = is_7976 ? MT_EE_RATE_DELTA_2G_V2 : MT_EE_RATE_DELTA_2G;
 	else if (band == NL80211_BAND_5GHZ)
 		offs = is_7976 ? MT_EE_RATE_DELTA_5G_V2 : MT_EE_RATE_DELTA_5G;
 	else
 		offs = is_7976 ? MT_EE_RATE_DELTA_6G_V2 : 0;

 	val = eeprom[offs];

 	if (!offs || !(val & MT_EE_RATE_DELTA_EN))
 		return 0;

 	delta = FIELD_GET(MT_EE_RATE_DELTA_MASK, val);

 	return val & MT_EE_RATE_DELTA_SIGN ? delta : -delta;
 }

 const u8 mt7915_sku_group_len[] = {
 	[SKU_CCK] = 4,
 	[SKU_OFDM] = 8,
 	[SKU_HT_BW20] = 8,
 	[SKU_HT_BW40] = 9,
 	[SKU_VHT_BW20] = 12,
 	[SKU_VHT_BW40] = 12,
 	[SKU_VHT_BW80] = 12,
 	[SKU_VHT_BW160] = 12,
 	[SKU_HE_RU26] = 12,
 	[SKU_HE_RU52] = 12,
 	[SKU_HE_RU106] = 12,
 	[SKU_HE_RU242] = 12,
 	[SKU_HE_RU484] = 12,
 	[SKU_HE_RU996] = 12,
 	[SKU_HE_RU2x996] = 12
 };
	// SPDX-License-Identifier: ISC
	/* Copyright (C) 2020 MediaTek Inc. */

	#include <linux/firmware.h>
	#include "mt7915.h"
	#include "eeprom.h"

	static int mt7915_eeprom_load_precal(struct mt7915_dev *dev)
	{
	struct mt76_dev *mdev = &dev->mt76;
	u8 *eeprom = mdev->eeprom.data;
	u32 val = eeprom[MT_EE_DO_PRE_CAL];
	u32 offs;
	int ret;

	if (!dev->flash_mode)
	return 0;

	if (val != (MT_EE_WIFI_CAL_DPD \| MT_EE_WIFI_CAL_GROUP))
	return 0;

	val = MT_EE_CAL_GROUP_SIZE + MT_EE_CAL_DPD_SIZE;
	dev->cal = devm_kzalloc(mdev->dev, val, GFP_KERNEL);
	if (!dev->cal)
	return -ENOMEM;

	offs = is_mt7915(&dev->mt76) ? MT_EE_PRECAL : MT_EE_PRECAL_V2;

	ret = mt76_get_of_data_from_mtd(mdev, dev->cal, offs, val);
	if (!ret)
	return ret;

	return mt76_get_of_data_from_nvmem(mdev, dev->cal, "precal", val);
	}

	static int mt7915_check_eeprom(struct mt7915_dev *dev)
	{
	u8 *eeprom = dev->mt76.eeprom.data;
	u16 val = get_unaligned_le16(eeprom);

	#define CHECK_EEPROM_ERR(match) (match ? 0 : -EINVAL)
	switch (val) {
	case 0x7915:
	return CHECK_EEPROM_ERR(is_mt7915(&dev->mt76));
	case 0x7916:
	return CHECK_EEPROM_ERR(is_mt7916(&dev->mt76));
	case 0x7981:
	return CHECK_EEPROM_ERR(is_mt7981(&dev->mt76));
	case 0x7986:
	return CHECK_EEPROM_ERR(is_mt7986(&dev->mt76));
	default:
	return -EINVAL;
	}
	}

	static char mt7915_eeprom_name(struct mt7915_dev dev)
	{
	switch (mt76_chip(&dev->mt76)) {
	case 0x7915:
	return dev->dbdc_support ?
	MT7915_EEPROM_DEFAULT_DBDC : MT7915_EEPROM_DEFAULT;
	case 0x7981:
	/* mt7981 only supports mt7976 and only in DBDC mode */
	return MT7981_EEPROM_MT7976_DEFAULT_DBDC;
	case 0x7986:
	switch (mt7915_check_adie(dev, true)) {
	case MT7976_ONE_ADIE_DBDC:
	return MT7986_EEPROM_MT7976_DEFAULT_DBDC;
	case MT7975_ONE_ADIE:
	return MT7986_EEPROM_MT7975_DEFAULT;
	case MT7976_ONE_ADIE:
	return MT7986_EEPROM_MT7976_DEFAULT;
	case MT7975_DUAL_ADIE:
	return MT7986_EEPROM_MT7975_DUAL_DEFAULT;
	case MT7976_DUAL_ADIE:
	return MT7986_EEPROM_MT7976_DUAL_DEFAULT;
	default:
	break;
	}
	return NULL;
	default:
	return MT7916_EEPROM_DEFAULT;
	}
	}

	static int
	mt7915_eeprom_load_default(struct mt7915_dev *dev)
	{
	u8 *eeprom = dev->mt76.eeprom.data;
	const struct firmware *fw = NULL;
	int ret;

	ret = request_firmware(&fw, mt7915_eeprom_name(dev), dev->mt76.dev);
	if (ret)
	return ret;

	if (!fw \|\| !fw->data) {
	dev_err(dev->mt76.dev, "Invalid default bin\n");
	ret = -EINVAL;
	goto out;
	}

	memcpy(eeprom, fw->data, mt7915_eeprom_size(dev));
	dev->flash_mode = true;

	out:
	release_firmware(fw);

	return ret;
	}

	static int mt7915_eeprom_load(struct mt7915_dev *dev)
	{
	int ret;
	u16 eeprom_size = mt7915_eeprom_size(dev);

	ret = mt76_eeprom_init(&dev->mt76, eeprom_size);
	if (ret < 0)
	return ret;

	if (ret) {
	dev->flash_mode = true;
	} else {
	u8 free_block_num;
	u32 block_num, i;
	u32 eeprom_blk_size = MT7915_EEPROM_BLOCK_SIZE;

	ret = mt7915_mcu_get_eeprom_free_block(dev, &free_block_num);
	if (ret < 0)
	return ret;

	/* efuse info isn't enough */
	if (free_block_num >= 29)
	return -EINVAL;

	/* read eeprom data from efuse */
	block_num = DIV_ROUND_UP(eeprom_size, eeprom_blk_size);
	for (i = 0; i < block_num; i++) {
	ret = mt7915_mcu_get_eeprom(dev, i * eeprom_blk_size);
	if (ret < 0)
	return ret;
	}
	}

	return mt7915_check_eeprom(dev);
	}

	static void mt7915_eeprom_parse_band_config(struct mt7915_phy *phy)
	{
	struct mt7915_dev *dev = phy->dev;
	u8 *eeprom = dev->mt76.eeprom.data;
	u8 band = phy->mt76->band_idx;
	u32 val;

	val = eeprom[MT_EE_WIFI_CONF + band];
	val = FIELD_GET(MT_EE_WIFI_CONF0_BAND_SEL, val);

	if (!is_mt7915(&dev->mt76)) {
	switch (val) {
	case MT_EE_V2_BAND_SEL_5GHZ:
	phy->mt76->cap.has_5ghz = true;
	return;
	case MT_EE_V2_BAND_SEL_6GHZ:
	phy->mt76->cap.has_6ghz = true;
	return;
	case MT_EE_V2_BAND_SEL_5GHZ_6GHZ:
	phy->mt76->cap.has_5ghz = true;
	phy->mt76->cap.has_6ghz = true;
	return;
	default:
	phy->mt76->cap.has_2ghz = true;
	return;
	}
	} else if (val == MT_EE_BAND_SEL_DEFAULT && dev->dbdc_support) {
	val = band ? MT_EE_BAND_SEL_5GHZ : MT_EE_BAND_SEL_2GHZ;
	}

	switch (val) {
	case MT_EE_BAND_SEL_5GHZ:
	phy->mt76->cap.has_5ghz = true;
	break;
	case MT_EE_BAND_SEL_2GHZ:
	phy->mt76->cap.has_2ghz = true;
	break;
	default:
	phy->mt76->cap.has_2ghz = true;
	phy->mt76->cap.has_5ghz = true;
	break;
	}
	}

	void mt7915_eeprom_parse_hw_cap(struct mt7915_dev *dev,
	struct mt7915_phy *phy)
	{
	u8 path, nss, nss_max = 4, *eeprom = dev->mt76.eeprom.data;
	struct mt76_phy *mphy = phy->mt76;
	u8 band = phy->mt76->band_idx;

	mt7915_eeprom_parse_band_config(phy);

	/* read tx/rx path from eeprom */
	if (is_mt7915(&dev->mt76)) {
	path = FIELD_GET(MT_EE_WIFI_CONF0_TX_PATH,
	eeprom[MT_EE_WIFI_CONF]);
	} else {
	path = FIELD_GET(MT_EE_WIFI_CONF0_TX_PATH,
	eeprom[MT_EE_WIFI_CONF + band]);
	}

	if (!path \|\| path > 4)
	path = 4;

	/* read tx/rx stream */
	nss = path;
	if (dev->dbdc_support) {
	if (is_mt7915(&dev->mt76)) {
	path = min_t(u8, path, 2);
	nss = FIELD_GET(MT_EE_WIFI_CONF3_TX_PATH_B0,
	eeprom[MT_EE_WIFI_CONF + 3]);
	if (band)
	nss = FIELD_GET(MT_EE_WIFI_CONF3_TX_PATH_B1,
	eeprom[MT_EE_WIFI_CONF + 3]);
	} else {
	nss = FIELD_GET(MT_EE_WIFI_CONF_STREAM_NUM,
	eeprom[MT_EE_WIFI_CONF + 2 + band]);
	}

	if (!is_mt798x(&dev->mt76))
	nss_max = 2;
	}

	if (!nss)
	nss = nss_max;
	nss = min_t(u8, min_t(u8, nss_max, nss), path);

	mphy->chainmask = BIT(path) - 1;
	if (band)
	mphy->chainmask <<= dev->chainshift;
	mphy->antenna_mask = BIT(nss) - 1;
	dev->chainmask \|= mphy->chainmask;
	dev->chainshift = hweight8(dev->mphy.chainmask);
	}

	int mt7915_eeprom_init(struct mt7915_dev *dev)
	{
	int ret;

	ret = mt7915_eeprom_load(dev);
	if (ret < 0) {
	if (ret != -EINVAL)
	return ret;

	dev_warn(dev->mt76.dev, "eeprom load fail, use default bin\n");
	ret = mt7915_eeprom_load_default(dev);
	if (ret)
	return ret;
	}

	ret = mt7915_eeprom_load_precal(dev);
	if (ret)
	return ret;

	mt7915_eeprom_parse_hw_cap(dev, &dev->phy);
	memcpy(dev->mphy.macaddr, dev->mt76.eeprom.data + MT_EE_MAC_ADDR,
	ETH_ALEN);

	mt76_eeprom_override(&dev->mphy);

	return 0;
	}

	int mt7915_eeprom_get_target_power(struct mt7915_dev *dev,
	struct ieee80211_channel *chan,
	u8 chain_idx)
	{
	u8 *eeprom = dev->mt76.eeprom.data;
	int index, target_power;
	bool tssi_on, is_7976;

	if (chain_idx > 3)
	return -EINVAL;

	tssi_on = mt7915_tssi_enabled(dev, chan->band);
	is_7976 = mt7915_check_adie(dev, false) \|\| is_mt7916(&dev->mt76);

	if (chan->band == NL80211_BAND_2GHZ) {
	if (is_7976) {
	index = MT_EE_TX0_POWER_2G_V2 + chain_idx;
	target_power = eeprom[index];
	} else {
	index = MT_EE_TX0_POWER_2G + chain_idx * 3;
	target_power = eeprom[index];

	if (!tssi_on)
	target_power += eeprom[index + 1];
	}
	} else if (chan->band == NL80211_BAND_5GHZ) {
	int group = mt7915_get_channel_group_5g(chan->hw_value, is_7976);

	if (is_7976) {
	index = MT_EE_TX0_POWER_5G_V2 + chain_idx * 5;
	target_power = eeprom[index + group];
	} else {
	index = MT_EE_TX0_POWER_5G + chain_idx * 12;
	target_power = eeprom[index + group];

	if (!tssi_on)
	target_power += eeprom[index + 8];
	}
	} else {
	int group = mt7915_get_channel_group_6g(chan->hw_value);

	index = MT_EE_TX0_POWER_6G_V2 + chain_idx * 8;
	target_power = is_7976 ? eeprom[index + group] : 0;
	}

	return target_power;
	}

	s8 mt7915_eeprom_get_power_delta(struct mt7915_dev *dev, int band)
	{
	u8 *eeprom = dev->mt76.eeprom.data;
	u32 val, offs;
	s8 delta;
	bool is_7976 = mt7915_check_adie(dev, false) \|\| is_mt7916(&dev->mt76);

	if (band == NL80211_BAND_2GHZ)
	offs = is_7976 ? MT_EE_RATE_DELTA_2G_V2 : MT_EE_RATE_DELTA_2G;
	else if (band == NL80211_BAND_5GHZ)
	offs = is_7976 ? MT_EE_RATE_DELTA_5G_V2 : MT_EE_RATE_DELTA_5G;
	else
	offs = is_7976 ? MT_EE_RATE_DELTA_6G_V2 : 0;

	val = eeprom[offs];

	if (!offs \|\| !(val & MT_EE_RATE_DELTA_EN))
	return 0;

	delta = FIELD_GET(MT_EE_RATE_DELTA_MASK, val);

	return val & MT_EE_RATE_DELTA_SIGN ? delta : -delta;
	}

	const u8 mt7915_sku_group_len[] = {
	[SKU_CCK] = 4,
	[SKU_OFDM] = 8,
	[SKU_HT_BW20] = 8,
	[SKU_HT_BW40] = 9,
	[SKU_VHT_BW20] = 12,
	[SKU_VHT_BW40] = 12,
	[SKU_VHT_BW80] = 12,
	[SKU_VHT_BW160] = 12,
	[SKU_HE_RU26] = 12,
	[SKU_HE_RU52] = 12,
	[SKU_HE_RU106] = 12,
	[SKU_HE_RU242] = 12,
	[SKU_HE_RU484] = 12,
	[SKU_HE_RU996] = 12,
	[SKU_HE_RU2x996] = 12
	};