mt76: mt7615: add support for applying tx DPD calibration from EEPROM

When the EEPROM data is read from flash, it can contain tx DPD calibration
data. Add support for sending the data to the firmware.
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt7615/main.c

@@ -253,8 +253,10 @@ static int mt7615_set_channel(struct mt7615_phy *phy)
 	mt7615_init_dfs_state(phy);
 	mt76_set_channel(phy->mt76);
 
-	if (is_mt7615(&dev->mt76) && dev->flash_eeprom)
+	if (is_mt7615(&dev->mt76) && dev->flash_eeprom) {
 		mt7615_mcu_apply_rx_dcoc(phy);
+		mt7615_mcu_apply_tx_dpd(phy);
+	}
 
 	ret = mt7615_mcu_set_chan_info(phy, MCU_EXT_CMD_CHANNEL_SWITCH);
 	if (ret)

drivers/net/wireless/mediatek/mt76/mt7615/mcu.c

@@ -2979,3 +2979,124 @@ int mt7615_mcu_apply_rx_dcoc(struct mt7615_phy *phy)
 
 	return ret;
 }
+
+static int mt7615_dpd_freq_idx(u16 freq, u8 bw)
+{
+	static const u16 freq_list[] = {
+		4920, 4940, 4960, 4980,
+		5040, 5060, 5080, 5180,
+		5200, 5220, 5240, 5260,
+		5280, 5300, 5320, 5340,
+		5360, 5380, 5400, 5420,
+		5440, 5460, 5480, 5500,
+		5520, 5540, 5560, 5580,
+		5600, 5620, 5640, 5660,
+		5680, 5700, 5720, 5745,
+		5765, 5785, 5805, 5825,
+		5845, 5865, 5885, 5905
+	};
+	int offset_2g = ARRAY_SIZE(freq_list);
+	int idx;
+
+	if (freq < 4000) {
+		if (freq < 2432)
+			return offset_2g;
+		if (freq < 2457)
+			return offset_2g + 1;
+
+		return offset_2g + 2;
+	}
+
+	if (bw != NL80211_CHAN_WIDTH_20) {
+		idx = mt7615_find_freq_idx(freq_list, ARRAY_SIZE(freq_list),
+					   freq + 10);
+		if (idx >= 0)
+			return idx;
+
+		idx = mt7615_find_freq_idx(freq_list, ARRAY_SIZE(freq_list),
+					   freq - 10);
+		if (idx >= 0)
+			return idx;
+	}
+
+	return mt7615_find_freq_idx(freq_list, ARRAY_SIZE(freq_list), freq);
+}
+
+
+int mt7615_mcu_apply_tx_dpd(struct mt7615_phy *phy)
+{
+	struct mt7615_dev *dev = phy->dev;
+	struct cfg80211_chan_def *chandef = &phy->mt76->chandef;
+	int freq2 = chandef->center_freq2;
+	int ret;
+	struct {
+		u8 direction;
+		u8 runtime_calibration;
+		u8 _rsv[2];
+
+		__le16 center_freq;
+		u8 bw;
+		u8 band;
+		u8 is_freq2;
+		u8 success;
+		u8 dbdc_en;
+
+		u8 _rsv2;
+
+		struct {
+			struct {
+				u32 dpd_g0;
+				u8 data[32];
+			} wf0, wf1;
+
+			struct {
+				u32 dpd_g0_prim;
+				u32 dpd_g0_sec;
+				u8 data_prim[32];
+				u8 data_sec[32];
+			} wf2, wf3;
+		} dpd_data;
+	} req = {
+		.direction = 1,
+
+		.bw = mt7615_mcu_chan_bw(chandef),
+		.band = chandef->center_freq1 > 4000,
+		.dbdc_en = !!dev->mt76.phy2,
+	};
+	u16 center_freq = chandef->center_freq1;
+	int freq_idx;
+	u8 *eep = dev->mt76.eeprom.data;
+
+	if (!(eep[MT_EE_CALDATA_FLASH] & MT_EE_CALDATA_FLASH_TX_DPD))
+		return 0;
+
+	if (chandef->width == NL80211_CHAN_WIDTH_160) {
+		freq2 = center_freq + 40;
+		center_freq -= 40;
+	}
+
+again:
+	req.runtime_calibration = 1;
+	freq_idx = mt7615_dpd_freq_idx(center_freq, chandef->width);
+	if (freq_idx < 0)
+		goto out;
+
+	memcpy(&req.dpd_data, eep + MT7615_EEPROM_TXDPD_OFFSET +
+			      freq_idx * MT7615_EEPROM_TXDPD_SIZE,
+	       sizeof(req.dpd_data));
+	req.runtime_calibration = 0;
+
+out:
+	req.center_freq = cpu_to_le16(center_freq);
+	ret = __mt76_mcu_send_msg(&dev->mt76, MCU_EXT_CMD_TXDPD_CAL, &req,
+				  sizeof(req), true);
+
+	if ((chandef->width == NL80211_CHAN_WIDTH_80P80 ||
+	     chandef->width == NL80211_CHAN_WIDTH_160) && !req.is_freq2) {
+		req.is_freq2 = true;
+		center_freq = freq2;
+		goto again;
+	}
+
+	return ret;
+}

drivers/net/wireless/mediatek/mt76/mt7615/mcu.h

@@ -271,6 +271,7 @@ enum {
 	MCU_EXT_CMD_SET_RX_PATH = 0x4e,
 	MCU_EXT_CMD_TX_POWER_FEATURE_CTRL = 0x58,
 	MCU_EXT_CMD_RXDCOC_CAL = 0x59,
+	MCU_EXT_CMD_TXDPD_CAL = 0x60,
 	MCU_EXT_CMD_SET_RDD_TH = 0x7c,
 	MCU_EXT_CMD_SET_RDD_PATTERN = 0x7d,
 };

drivers/net/wireless/mediatek/mt76/mt7615/mt7615.h

@@ -496,6 +496,7 @@ int mt7615_mcu_set_radar_th(struct mt7615_dev *dev, int index,
 			    const struct mt7615_dfs_pattern *pattern);
 int mt7615_mcu_set_sku_en(struct mt7615_phy *phy, bool enable);
 int mt7615_mcu_apply_rx_dcoc(struct mt7615_phy *phy);
+int mt7615_mcu_apply_tx_dpd(struct mt7615_phy *phy);
 int mt7615_dfs_init_radar_detector(struct mt7615_phy *phy);
 
 int mt7615_init_debugfs(struct mt7615_dev *dev);