rt2800: comment tx power settings
Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com> Acked-by: Gertjan van Wingerde <gwingerde@gmail.com> Acked-by: Ivo van Doorn <IvDoorn@gmail.com> Acked-by: Helmut Schaa <helmut.schaa@googlemail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
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@ -2586,6 +2586,15 @@ static u8 rt2800_compensate_txpower(struct rt2x00_dev *rt2x00dev, int is_rate_b,
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return min_t(u8, txpower, 0xc);
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}
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/*
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* We configure transmit power using MAC TX_PWR_CFG_{0,...,N} registers and
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* BBP R1 register. TX_PWR_CFG_X allow to configure per rate TX power values,
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* 4 bits for each rate (tune from 0 to 15 dBm). BBP_R1 controls transmit power
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* for all rates, but allow to set only 4 discrete values: -12, -6, 0 and 6 dBm.
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* Reference per rate transmit power values are located in the EEPROM at
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* EEPROM_TXPOWER_BYRATE offset. We adjust them and BBP R1 settings according to
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* current conditions (i.e. band, bandwidth, temperature, user settings).
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*/
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static void rt2800_config_txpower(struct rt2x00_dev *rt2x00dev,
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struct ieee80211_channel *chan,
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int power_level)
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@ -2597,17 +2606,24 @@ static void rt2800_config_txpower(struct rt2x00_dev *rt2x00dev,
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enum ieee80211_band band = chan->band;
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/*
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* Calculate HT40 compensation delta
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* Calculate HT40 compensation. For 40MHz we need to add or subtract
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* value read from EEPROM (different for 2GHz and for 5GHz).
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*/
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delta = rt2800_get_txpower_bw_comp(rt2x00dev, band);
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/*
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* calculate temperature compensation delta
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* Calculate temperature compensation. Depends on measurement of current
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* TSSI (Transmitter Signal Strength Indication) we know TX power (due
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* to temperature or maybe other factors) is smaller or bigger than
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* expected. We adjust it, based on TSSI reference and boundaries values
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* provided in EEPROM.
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*/
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delta += rt2800_get_gain_calibration_delta(rt2x00dev);
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/*
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* Apply regulatory delta.
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* Decrease power according to user settings, on devices with unknown
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* maximum tx power. For other devices we take user power_level into
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* consideration on rt2800_compensate_txpower().
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*/
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delta += rt2800_get_txpower_reg_delta(rt2x00dev, power_level,
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chan->max_power);
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