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rt2800: use BBP_R1 for setting tx power

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TX power delta can be negative. TX_PWR_CFG_ registers allow to set delta
only in range between 0 dBm and 15 dBm (4 bits for each rate). Se we
need to use BBP_R1 to configure negative deltas.

Not utilize +6 dBm increasing BBP_R1 option for safety reason. For now,
this can be used for devices, which export maximum allowed TX power
value.

Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Acked-by: Helmut Schaa <helmut.schaa@googlemail.com>
Acked-by: Gertjan van Wingerde <gwingerde@gmail.com>
Acked-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Stanislaw Gruszka 2012-10-05 13:44:09 +02:00 committed by John W. Linville
parent 037fd9b647
commit cee2c7315f
1 changed files with 19 additions and 8 deletions
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27
drivers/net/wireless/rt2x00/rt2800lib.c
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@ -2570,13 +2570,10 @@ static void rt2800_config_txpower(struct rt2x00_dev *rt2x00dev,
enum ieee80211_band band,
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;
/*
* Calculate HT40 compensation delta
@ -2589,10 +2586,24 @@ static void rt2800_config_txpower(struct rt2x00_dev *rt2x00dev,
delta += rt2800_get_gain_calibration_delta(rt2x00dev);
/*
* set to normal bbp tx power control mode: +/- 0dBm
* 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;