diff options
Diffstat (limited to 'drivers/net/wireless/rt2x00/rt2800lib.c')
| -rw-r--r-- | drivers/net/wireless/rt2x00/rt2800lib.c | 100 |
1 files changed, 77 insertions, 23 deletions
diff --git a/drivers/net/wireless/rt2x00/rt2800lib.c b/drivers/net/wireless/rt2x00/rt2800lib.c index 59474ae..c0441a7 100644 --- a/drivers/net/wireless/rt2x00/rt2800lib.c +++ b/drivers/net/wireless/rt2x00/rt2800lib.c @@ -2520,20 +2520,37 @@ static int rt2800_get_txpower_bw_comp(struct rt2x00_dev *rt2x00dev, return comp_value; } +static int rt2800_get_txpower_reg_delta(struct rt2x00_dev *rt2x00dev, + int power_level, int max_power) +{ + int delta; + + if (test_bit(CAPABILITY_POWER_LIMIT, &rt2x00dev->cap_flags)) + return 0; + + /* + * XXX: We don't know the maximum transmit power of our hardware since + * the EEPROM doesn't expose it. We only know that we are calibrated + * to 100% tx power. + * + * Hence, we assume the regulatory limit that cfg80211 calulated for + * the current channel is our maximum and if we are requested to lower + * the value we just reduce our tx power accordingly. + */ + delta = power_level - max_power; + return min(delta, 0); +} + static u8 rt2800_compensate_txpower(struct rt2x00_dev *rt2x00dev, int is_rate_b, enum ieee80211_band band, int power_level, u8 txpower, int delta) { - u32 reg; u16 eeprom; u8 criterion; u8 eirp_txpower; u8 eirp_txpower_criterion; u8 reg_limit; - if (!((band == IEEE80211_BAND_5GHZ) && is_rate_b)) - return txpower; - if (test_bit(CAPABILITY_POWER_LIMIT, &rt2x00dev->cap_flags)) { /* * Check if eirp txpower exceed txpower_limit. @@ -2542,11 +2559,13 @@ static u8 rt2800_compensate_txpower(struct rt2x00_dev *rt2x00dev, int is_rate_b, * .11b data rate need add additional 4dbm * when calculating eirp txpower. */ - rt2800_register_read(rt2x00dev, TX_PWR_CFG_0, ®); - criterion = rt2x00_get_field32(reg, TX_PWR_CFG_0_6MBS); + rt2x00_eeprom_read(rt2x00dev, EEPROM_TXPOWER_BYRATE + 1, + &eeprom); + criterion = rt2x00_get_field16(eeprom, + EEPROM_TXPOWER_BYRATE_RATE0); - rt2x00_eeprom_read(rt2x00dev, - EEPROM_EIRP_MAX_TX_POWER, &eeprom); + rt2x00_eeprom_read(rt2x00dev, EEPROM_EIRP_MAX_TX_POWER, + &eeprom); if (band == IEEE80211_BAND_2GHZ) eirp_txpower_criterion = rt2x00_get_field16(eeprom, @@ -2563,36 +2582,71 @@ static u8 rt2800_compensate_txpower(struct rt2x00_dev *rt2x00dev, int is_rate_b, } else reg_limit = 0; - return txpower + delta - reg_limit; + txpower = max(0, txpower + delta - reg_limit); + return min_t(u8, txpower, 0xc); } +/* + * We configure transmit power using MAC TX_PWR_CFG_{0,...,N} registers and + * BBP R1 register. TX_PWR_CFG_X allow to configure per rate TX power values, + * 4 bits for each rate (tune from 0 to 15 dBm). BBP_R1 controls transmit power + * for all rates, but allow to set only 4 discrete values: -12, -6, 0 and 6 dBm. + * Reference per rate transmit power values are located in the EEPROM at + * EEPROM_TXPOWER_BYRATE offset. We adjust them and BBP R1 settings according to + * current conditions (i.e. band, bandwidth, temperature, user settings). + */ static void rt2800_config_txpower(struct rt2x00_dev *rt2x00dev, - enum ieee80211_band band, + struct ieee80211_channel *chan, int power_level) { - u8 txpower; + u8 txpower, r1; u16 eeprom; - int i, is_rate_b; - u32 reg; - u8 r1; - u32 offset; - int delta; + u32 reg, offset; + int i, is_rate_b, delta, power_ctrl; + enum ieee80211_band band = chan->band; /* - * Calculate HT40 compensation delta + * Calculate HT40 compensation. For 40MHz we need to add or subtract + * value read from EEPROM (different for 2GHz and for 5GHz). */ delta = rt2800_get_txpower_bw_comp(rt2x00dev, band); /* - * calculate temperature compensation delta + * Calculate temperature compensation. Depends on measurement of current + * TSSI (Transmitter Signal Strength Indication) we know TX power (due + * to temperature or maybe other factors) is smaller or bigger than + * expected. We adjust it, based on TSSI reference and boundaries values + * provided in EEPROM. */ delta += rt2800_get_gain_calibration_delta(rt2x00dev); /* - * set to normal bbp tx power control mode: +/- 0dBm + * Decrease power according to user settings, on devices with unknown + * maximum tx power. For other devices we take user power_level into + * consideration on rt2800_compensate_txpower(). + */ + delta += rt2800_get_txpower_reg_delta(rt2x00dev, power_level, + chan->max_power); + + /* + * BBP_R1 controls TX power for all rates, it allow to set the following + * gains -12, -6, 0, +6 dBm by setting values 2, 1, 0, 3 respectively. + * + * TODO: we do not use +6 dBm option to do not increase power beyond + * regulatory limit, however this could be utilized for devices with + * CAPABILITY_POWER_LIMIT. */ rt2800_bbp_read(rt2x00dev, 1, &r1); - rt2x00_set_field8(&r1, BBP1_TX_POWER_CTRL, 0); + if (delta <= -12) { + power_ctrl = 2; + delta += 12; + } else if (delta <= -6) { + power_ctrl = 1; + delta += 6; + } else { + power_ctrl = 0; + } + rt2x00_set_field8(&r1, BBP1_TX_POWER_CTRL, power_ctrl); rt2800_bbp_write(rt2x00dev, 1, r1); offset = TX_PWR_CFG_0; @@ -2710,7 +2764,7 @@ static void rt2800_config_txpower(struct rt2x00_dev *rt2x00dev, void rt2800_gain_calibration(struct rt2x00_dev *rt2x00dev) { - rt2800_config_txpower(rt2x00dev, rt2x00dev->curr_band, + rt2800_config_txpower(rt2x00dev, rt2x00dev->hw->conf.channel, rt2x00dev->tx_power); } EXPORT_SYMBOL_GPL(rt2800_gain_calibration); @@ -2845,11 +2899,11 @@ void rt2800_config(struct rt2x00_dev *rt2x00dev, if (flags & IEEE80211_CONF_CHANGE_CHANNEL) { rt2800_config_channel(rt2x00dev, libconf->conf, &libconf->rf, &libconf->channel); - rt2800_config_txpower(rt2x00dev, libconf->conf->channel->band, + rt2800_config_txpower(rt2x00dev, libconf->conf->channel, libconf->conf->power_level); } if (flags & IEEE80211_CONF_CHANGE_POWER) - rt2800_config_txpower(rt2x00dev, libconf->conf->channel->band, + rt2800_config_txpower(rt2x00dev, libconf->conf->channel, libconf->conf->power_level); if (flags & IEEE80211_CONF_CHANGE_RETRY_LIMITS) rt2800_config_retry_limit(rt2x00dev, libconf); |