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ath9k: Differentiate between max combined and per chain power

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The ath9k driver uses as maximum allowed txpower the constant
MAX_RATE_POWER. It is used to set a maximum txpower limit for the PHY
(which is combined txpower) and also the maximum txpower for per chain
rates. Its value 63 is derived from the maximum number the registers can
store for the per chain txpower.

The max txpower a user can set because of this is 31 dBm (floor(63 / 2)).
This also means that a device with multiple tx chains is even limited
further:

* 1 chain:  31 dBm per chain
* 2 chains: 28 dBm per chain
* 3 chains: 26 dBm per chain

This combined txpower limit of 31 dBm becomes even more problematic when
some extra antenna gain is set in the EEPROM. A high power device is then
no longer able to reach its potential limits.

Instead the code dealing with the combined txpower must use a higher limit
than 63 and only the code dealing with the per chain txpower have to use
the limit of 63. Since the antenna gain can be quite large and 8 bit
variables are often used in ath9k for txpower, a large, divisible by two
number like 254 is a good choice for this new limit.

Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
This commit is contained in:
Sven Eckelmann 2019-03-20 11:37:23 +01:00 committed by Kalle Valo
parent 2f90c7e5d0
commit b037b10756
5 changed files with 8 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/net/wireless/ath/ath9k/eeprom.c
View File

@ -428,7 +428,7 @@ u16 ath9k_hw_get_scaled_power(struct ath_hw *ah, u16 power_limit,
else
power_limit = 0;
return power_limit;
return min_t(u16, power_limit, MAX_RATE_POWER);
}
void ath9k_hw_update_regulatory_maxpower(struct ath_hw *ah)

1
drivers/net/wireless/ath/ath9k/eeprom_4k.c
View File

@ -424,6 +424,7 @@ static void ath9k_hw_set_4k_power_per_rate_table(struct ath_hw *ah,
ath9k_hw_get_channel_centers(ah, chan, &centers);
scaledPower = powerLimit - antenna_reduction;
scaledPower = min_t(u16, scaledPower, MAX_RATE_POWER);
numCtlModes = ARRAY_SIZE(ctlModesFor11g) - SUB_NUM_CTL_MODES_AT_2G_40;
pCtlMode = ctlModesFor11g;

8
drivers/net/wireless/ath/ath9k/hw.c
View File

@ -457,7 +457,7 @@ static void ath9k_hw_init_defaults(struct ath_hw *ah)
struct ath_regulatory *regulatory = ath9k_hw_regulatory(ah);
regulatory->country_code = CTRY_DEFAULT;
regulatory->power_limit = MAX_RATE_POWER;
regulatory->power_limit = MAX_COMBINED_POWER;
ah->hw_version.magic = AR5416_MAGIC;
ah->hw_version.subvendorid = 0;
@ -2966,7 +2966,7 @@ void ath9k_hw_apply_txpower(struct ath_hw *ah, struct ath9k_channel *chan,
ctl = ath9k_regd_get_ctl(reg, chan);
channel = chan->chan;
chan_pwr = min_t(int, channel->max_power * 2, MAX_RATE_POWER);
chan_pwr = min_t(int, channel->max_power * 2, MAX_COMBINED_POWER);
new_pwr = min_t(int, chan_pwr, reg->power_limit);
ah->eep_ops->set_txpower(ah, chan, ctl,
@ -2979,9 +2979,9 @@ void ath9k_hw_set_txpowerlimit(struct ath_hw *ah, u32 limit, bool test)
struct ath9k_channel *chan = ah->curchan;
struct ieee80211_channel *channel = chan->chan;
reg->power_limit = min_t(u32, limit, MAX_RATE_POWER);
reg->power_limit = min_t(u32, limit, MAX_COMBINED_POWER);
if (test)
channel->max_power = MAX_RATE_POWER / 2;
channel->max_power = MAX_COMBINED_POWER / 2;
ath9k_hw_apply_txpower(ah, chan, test);

1
drivers/net/wireless/ath/ath9k/hw.h
View File

@ -173,6 +173,7 @@
#define ATH9K_NUM_QUEUES 10
#define MAX_RATE_POWER 63
#define MAX_COMBINED_POWER 254 /* 128 dBm, chosen to fit in u8 */
#define AH_WAIT_TIMEOUT 100000 /* (us) */
#define AH_TSF_WRITE_TIMEOUT 100 /* (us) */
#define AH_TIME_QUANTUM 10

2
drivers/net/wireless/ath/ath9k/init.c
View File

@ -805,7 +805,7 @@ static void ath9k_init_band_txpower(struct ath_softc *sc, int band)
ah->curchan = &ah->channels[chan->hw_value];
cfg80211_chandef_create(&chandef, chan, NL80211_CHAN_HT20);
ath9k_cmn_get_channel(sc->hw, ah, &chandef);
ath9k_hw_set_txpowerlimit(ah, MAX_RATE_POWER, true);
ath9k_hw_set_txpowerlimit(ah, MAX_COMBINED_POWER, true);
}
}