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Commit 7a66205a authored by Stanislaw Gruszka's avatar Stanislaw Gruszka Committed by John W. Linville
Browse files

rt2800: comment tx power settings 



Signed-off-by: default avatarStanislaw Gruszka <sgruszka@redhat.com>
Acked-by: default avatarGertjan van Wingerde <gwingerde@gmail.com>
Acked-by: default avatarIvo van Doorn <IvDoorn@gmail.com>
Acked-by: default avatarHelmut Schaa <helmut.schaa@googlemail.com>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent 1e4cf249

drivers/net/wireless/rt2x00/rt2800lib.c

+19 −3
Original line number Original line Diff line number Diff line
@@ -2586,6 +2586,15 @@ static u8 rt2800_compensate_txpower(struct rt2x00_dev *rt2x00dev, int is_rate_b, 
	return min_t(u8, txpower, 0xc);

	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,

static void rt2800_config_txpower(struct rt2x00_dev *rt2x00dev,

				  struct ieee80211_channel *chan,

				  struct ieee80211_channel *chan,

				  int power_level)

				  int power_level)
@@ -2597,17 +2606,24 @@ static void rt2800_config_txpower(struct rt2x00_dev *rt2x00dev, 
	enum ieee80211_band band = chan->band;

	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);

	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);

	delta += rt2800_get_gain_calibration_delta(rt2x00dev);





	/*

	/*

	 * Apply regulatory delta.

	 * 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,

	delta += rt2800_get_txpower_reg_delta(rt2x00dev, power_level,

					      chan->max_power);

					      chan->max_power);