diff options
Diffstat (limited to 'package/kernel/mac80211/patches/rt2x00/001-v6.6-wifi-rt2x00-limit-MT7620-TX-power-based-on-eeprom.patch')
| -rw-r--r-- | package/kernel/mac80211/patches/rt2x00/001-v6.6-wifi-rt2x00-limit-MT7620-TX-power-based-on-eeprom.patch | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/package/kernel/mac80211/patches/rt2x00/001-v6.6-wifi-rt2x00-limit-MT7620-TX-power-based-on-eeprom.patch b/package/kernel/mac80211/patches/rt2x00/001-v6.6-wifi-rt2x00-limit-MT7620-TX-power-based-on-eeprom.patch new file mode 100644 index 00000000000..aa843d42198 --- /dev/null +++ b/package/kernel/mac80211/patches/rt2x00/001-v6.6-wifi-rt2x00-limit-MT7620-TX-power-based-on-eeprom.patch @@ -0,0 +1,115 @@ +From 821b5192c955144bd2f0aeea6cd153e1aedd16e1 Mon Sep 17 00:00:00 2001 +From: Shiji Yang <yangshiji66@outlook.com> +Date: Fri, 11 Aug 2023 14:34:54 +0800 +Subject: wifi: rt2x00: limit MT7620 TX power based on eeprom calibration + +In the vendor driver, the current channel power is queried from +EEPROM_TXPOWER_BG1 and EEPROM_TXPOWER_BG2. And then the mixed value +will be written into the low half-word of the TX_ALC_CFG_0 register. +The high half-word of the TX_ALC_CFG_0 is a fixed value 0x2f2f. + +We can't get the accurate TX power. Based on my tests and the new +MediaTek mt76 driver source code, the real TX power is approximately +equal to channel_power + (max) rate_power. Usually max rate_power is +the gain of the OFDM 6M rate, which can be readed from the offset +EEPROM_TXPOWER_BYRATE +1. + +Based on these eeprom values, this patch adds basic TX power control +for the MT7620 and limits its maximum TX power. This can avoid the +link speed decrease caused by chip overheating. rt2800_config_alc() +function has also been renamed to rt2800_config_alc_rt6352() because +it's only used by RT6352 (MT7620). + +Notice: +It's still need some work to sync the max channel power to the user +interface. This part is missing from the rt2x00 driver framework. If +we set the power exceed the calibration value, it won't take effect. + +Signed-off-by: Shiji Yang <yangshiji66@outlook.com> +Acked-by: Stanislaw Gruszka <stf_xl@wp.pl> +Signed-off-by: Kalle Valo <kvalo@kernel.org> +Link: https://lore.kernel.org/r/TYAP286MB03159090ED14044215E59FD6BC10A@TYAP286MB0315.JPNP286.PROD.OUTLOOK.COM +--- + drivers/net/wireless/ralink/rt2x00/rt2800lib.c | 57 ++++++++++++++++++-------- + 1 file changed, 40 insertions(+), 17 deletions(-) + +--- a/drivers/net/wireless/ralink/rt2x00/rt2800lib.c ++++ b/drivers/net/wireless/ralink/rt2x00/rt2800lib.c +@@ -3865,28 +3865,51 @@ static void rt2800_config_channel_rf7620 + } + } + +-static void rt2800_config_alc(struct rt2x00_dev *rt2x00dev, +- struct ieee80211_channel *chan, +- int power_level) { +- u16 eeprom, target_power, max_power; ++static void rt2800_config_alc_rt6352(struct rt2x00_dev *rt2x00dev, ++ struct ieee80211_channel *chan, ++ int power_level) ++{ ++ int cur_channel = rt2x00dev->rf_channel; ++ u16 eeprom, chan_power, rate_power, target_power; ++ u16 tx_power[2]; ++ s8 *power_group[2]; + u32 mac_sys_ctrl; +- u32 reg; ++ u32 cnt, reg; + u8 bbp; + +- /* hardware unit is 0.5dBm, limited to 23.5dBm */ +- power_level *= 2; +- if (power_level > 0x2f) +- power_level = 0x2f; +- +- max_power = chan->max_power * 2; +- if (max_power > 0x2f) +- max_power = 0x2f; ++ if (WARN_ON(cur_channel < 1 || cur_channel > 14)) ++ return; ++ ++ /* get per chain power, 2 chains in total, unit is 0.5dBm */ ++ power_level = (power_level - 3) * 2; ++ ++ /* We can't get the accurate TX power. Based on some tests, the real ++ * TX power is approximately equal to channel_power + (max)rate_power. ++ * Usually max rate_power is the gain of the OFDM 6M rate. The antenna ++ * gain and externel PA gain are not included as we are unable to ++ * obtain these values. ++ */ ++ rate_power = rt2800_eeprom_read_from_array(rt2x00dev, ++ EEPROM_TXPOWER_BYRATE, 1); ++ rate_power &= 0x3f; ++ power_level -= rate_power; ++ if (power_level < 1) ++ power_level = 1; ++ ++ power_group[0] = rt2800_eeprom_addr(rt2x00dev, EEPROM_TXPOWER_BG1); ++ power_group[1] = rt2800_eeprom_addr(rt2x00dev, EEPROM_TXPOWER_BG2); ++ for (cnt = 0; cnt < 2; cnt++) { ++ chan_power = power_group[cnt][cur_channel - 1]; ++ if (chan_power >= 0x20 || chan_power == 0) ++ chan_power = 0x10; ++ tx_power[cnt] = power_level < chan_power ? power_level : chan_power; ++ } + + reg = rt2800_register_read(rt2x00dev, TX_ALC_CFG_0); +- rt2x00_set_field32(®, TX_ALC_CFG_0_CH_INIT_0, power_level); +- rt2x00_set_field32(®, TX_ALC_CFG_0_CH_INIT_1, power_level); +- rt2x00_set_field32(®, TX_ALC_CFG_0_LIMIT_0, max_power); +- rt2x00_set_field32(®, TX_ALC_CFG_0_LIMIT_1, max_power); ++ rt2x00_set_field32(®, TX_ALC_CFG_0_CH_INIT_0, tx_power[0]); ++ rt2x00_set_field32(®, TX_ALC_CFG_0_CH_INIT_1, tx_power[1]); ++ rt2x00_set_field32(®, TX_ALC_CFG_0_LIMIT_0, 0x2f); ++ rt2x00_set_field32(®, TX_ALC_CFG_0_LIMIT_1, 0x2f); + + eeprom = rt2800_eeprom_read(rt2x00dev, EEPROM_NIC_CONF1); + if (rt2x00_get_field16(eeprom, EEPROM_NIC_CONF1_INTERNAL_TX_ALC)) { +@@ -5268,7 +5291,7 @@ static void rt2800_config_txpower_rt6352 + rt2x00_set_field32(&pwreg, TX_PWR_CFG_9B_STBC_MCS7, t); + rt2800_register_write(rt2x00dev, TX_PWR_CFG_9, pwreg); + +- rt2800_config_alc(rt2x00dev, chan, power_level); ++ rt2800_config_alc_rt6352(rt2x00dev, chan, power_level); + + /* TODO: temperature compensation code! */ + } |