[PATCH 4/4] mt76: mt7615: add support for applying tx DPD calibration from EEPROM

Felix Fietkau
2020-04-06T10:22:09Z

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>
---
.../net/wireless/mediatek/mt76/mt7615/main.c | 4 +-
.../net/wireless/mediatek/mt76/mt7615/mcu.c | 120 ++++++++++++++++++
.../net/wireless/mediatek/mt76/mt7615/mcu.h | 1 +
.../wireless/mediatek/mt76/mt7615/mt7615.h | 1 +
4 files changed, 125 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/main.c b/drivers/net/wireless/mediatek/mt76/mt7615/main.c
index ef8e9336f627..b346080458bc 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7615/main.c
+++ b/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)
diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/mcu.c b/drivers/net/wireless/mediatek/mt76/mt7615/mcu.c
index 809aa6612d2b..b236612dd033 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7615/mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7615/mcu.c
@@ -2978,3 +2978,123 @@ 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,
+
+ .center_freq = chandef->center_freq1,
+ .bw = mt7615_mcu_chan_bw(chandef),
+ .band = chandef->center_freq1 > 4000,
+ .dbdc_en = !!dev->mt76.phy2,
+ };
+ 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 = req.center_freq + 40;
+ req.center_freq -= 40;
+ }
+
+again:
+ req.runtime_calibration = 1;
+ freq_idx = mt7615_dpd_freq_idx(req.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:
+ 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;
+ req.center_freq = freq2;
+ goto again;
+ }
+
+ return ret;
+}
diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/mcu.h b/drivers/net/wireless/mediatek/mt76/mt7615/mcu.h
index 427478002e67..983625fb72ee 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7615/mcu.h
+++ b/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,
};
diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/mt7615.h b/drivers/net/wireless/mediatek/mt76/mt7615/mt7615.h
index 39c792826c48..65a2b30fc588 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7615/mt7615.h
+++ b/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);
--
2.24.0