rt2x00: Implement tx power temperature compensation
rt2800 devices should adjust their tx power in accordance with the
eeproms temperature calibration values. Add a new driver callback
gain_calibration that is called every 4 seconds.
The rt2800 gain calibration routine simply runs the tx power
configuration that takes care of calculating the temperature
compensation delta.
We don't need to synchronize the calls to rt2800_config_txpower
as they should all happen from mac80211's single threaded workqueue.
Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/rt2x00/rt2800lib.c b/drivers/net/wireless/rt2x00/rt2800lib.c
index 0265133..59302fa 100644
--- a/drivers/net/wireless/rt2x00/rt2800lib.c
+++ b/drivers/net/wireless/rt2x00/rt2800lib.c
@@ -1813,6 +1813,116 @@
rt2800_register_read(rt2x00dev, CH_BUSY_STA_SEC, ®);
}
+static int rt2800_get_gain_calibration_delta(struct rt2x00_dev *rt2x00dev)
+{
+ u8 tssi_bounds[9];
+ u8 current_tssi;
+ u16 eeprom;
+ u8 step;
+ int i;
+
+ /*
+ * Read TSSI boundaries for temperature compensation from
+ * the EEPROM.
+ *
+ * Array idx 0 1 2 3 4 5 6 7 8
+ * Matching Delta value -4 -3 -2 -1 0 +1 +2 +3 +4
+ * Example TSSI bounds 0xF0 0xD0 0xB5 0xA0 0x88 0x45 0x25 0x15 0x00
+ */
+ if (rt2x00dev->curr_band == IEEE80211_BAND_2GHZ) {
+ rt2x00_eeprom_read(rt2x00dev, EEPROM_TSSI_BOUND_BG1, &eeprom);
+ tssi_bounds[0] = rt2x00_get_field16(eeprom,
+ EEPROM_TSSI_BOUND_BG1_MINUS4);
+ tssi_bounds[1] = rt2x00_get_field16(eeprom,
+ EEPROM_TSSI_BOUND_BG1_MINUS3);
+
+ rt2x00_eeprom_read(rt2x00dev, EEPROM_TSSI_BOUND_BG2, &eeprom);
+ tssi_bounds[2] = rt2x00_get_field16(eeprom,
+ EEPROM_TSSI_BOUND_BG2_MINUS2);
+ tssi_bounds[3] = rt2x00_get_field16(eeprom,
+ EEPROM_TSSI_BOUND_BG2_MINUS1);
+
+ rt2x00_eeprom_read(rt2x00dev, EEPROM_TSSI_BOUND_BG3, &eeprom);
+ tssi_bounds[4] = rt2x00_get_field16(eeprom,
+ EEPROM_TSSI_BOUND_BG3_REF);
+ tssi_bounds[5] = rt2x00_get_field16(eeprom,
+ EEPROM_TSSI_BOUND_BG3_PLUS1);
+
+ rt2x00_eeprom_read(rt2x00dev, EEPROM_TSSI_BOUND_BG4, &eeprom);
+ tssi_bounds[6] = rt2x00_get_field16(eeprom,
+ EEPROM_TSSI_BOUND_BG4_PLUS2);
+ tssi_bounds[7] = rt2x00_get_field16(eeprom,
+ EEPROM_TSSI_BOUND_BG4_PLUS3);
+
+ rt2x00_eeprom_read(rt2x00dev, EEPROM_TSSI_BOUND_BG5, &eeprom);
+ tssi_bounds[8] = rt2x00_get_field16(eeprom,
+ EEPROM_TSSI_BOUND_BG5_PLUS4);
+
+ step = rt2x00_get_field16(eeprom,
+ EEPROM_TSSI_BOUND_BG5_AGC_STEP);
+ } else {
+ rt2x00_eeprom_read(rt2x00dev, EEPROM_TSSI_BOUND_A1, &eeprom);
+ tssi_bounds[0] = rt2x00_get_field16(eeprom,
+ EEPROM_TSSI_BOUND_A1_MINUS4);
+ tssi_bounds[1] = rt2x00_get_field16(eeprom,
+ EEPROM_TSSI_BOUND_A1_MINUS3);
+
+ rt2x00_eeprom_read(rt2x00dev, EEPROM_TSSI_BOUND_A2, &eeprom);
+ tssi_bounds[2] = rt2x00_get_field16(eeprom,
+ EEPROM_TSSI_BOUND_A2_MINUS2);
+ tssi_bounds[3] = rt2x00_get_field16(eeprom,
+ EEPROM_TSSI_BOUND_A2_MINUS1);
+
+ rt2x00_eeprom_read(rt2x00dev, EEPROM_TSSI_BOUND_A3, &eeprom);
+ tssi_bounds[4] = rt2x00_get_field16(eeprom,
+ EEPROM_TSSI_BOUND_A3_REF);
+ tssi_bounds[5] = rt2x00_get_field16(eeprom,
+ EEPROM_TSSI_BOUND_A3_PLUS1);
+
+ rt2x00_eeprom_read(rt2x00dev, EEPROM_TSSI_BOUND_A4, &eeprom);
+ tssi_bounds[6] = rt2x00_get_field16(eeprom,
+ EEPROM_TSSI_BOUND_A4_PLUS2);
+ tssi_bounds[7] = rt2x00_get_field16(eeprom,
+ EEPROM_TSSI_BOUND_A4_PLUS3);
+
+ rt2x00_eeprom_read(rt2x00dev, EEPROM_TSSI_BOUND_A5, &eeprom);
+ tssi_bounds[8] = rt2x00_get_field16(eeprom,
+ EEPROM_TSSI_BOUND_A5_PLUS4);
+
+ step = rt2x00_get_field16(eeprom,
+ EEPROM_TSSI_BOUND_A5_AGC_STEP);
+ }
+
+ /*
+ * Check if temperature compensation is supported.
+ */
+ if (tssi_bounds[4] == 0xff)
+ return 0;
+
+ /*
+ * Read current TSSI (BBP 49).
+ */
+ rt2800_bbp_read(rt2x00dev, 49, ¤t_tssi);
+
+ /*
+ * Compare TSSI value (BBP49) with the compensation boundaries
+ * from the EEPROM and increase or decrease tx power.
+ */
+ for (i = 0; i <= 3; i++) {
+ if (current_tssi > tssi_bounds[i])
+ break;
+ }
+
+ if (i == 4) {
+ for (i = 8; i >= 5; i--) {
+ if (current_tssi < tssi_bounds[i])
+ break;
+ }
+ }
+
+ return (i - 4) * step;
+}
+
static int rt2800_get_txpower_bw_comp(struct rt2x00_dev *rt2x00dev,
enum ieee80211_band band)
{
@@ -1904,7 +2014,8 @@
}
static void rt2800_config_txpower(struct rt2x00_dev *rt2x00dev,
- struct ieee80211_conf *conf)
+ enum ieee80211_band band,
+ int power_level)
{
u8 txpower;
u16 eeprom;
@@ -1912,8 +2023,6 @@
u32 reg;
u8 r1;
u32 offset;
- enum ieee80211_band band = conf->channel->band;
- int power_level = conf->power_level;
int delta;
/*
@@ -1922,6 +2031,11 @@
delta = rt2800_get_txpower_bw_comp(rt2x00dev, band);
/*
+ * calculate temperature compensation delta
+ */
+ delta += rt2800_get_gain_calibration_delta(rt2x00dev);
+
+ /*
* set to normal bbp tx power control mode: +/- 0dBm
*/
rt2800_bbp_read(rt2x00dev, 1, &r1);
@@ -2041,6 +2155,13 @@
}
}
+void rt2800_gain_calibration(struct rt2x00_dev *rt2x00dev)
+{
+ rt2800_config_txpower(rt2x00dev, rt2x00dev->curr_band,
+ rt2x00dev->tx_power);
+}
+EXPORT_SYMBOL_GPL(rt2800_gain_calibration);
+
static void rt2800_config_retry_limit(struct rt2x00_dev *rt2x00dev,
struct rt2x00lib_conf *libconf)
{
@@ -2094,10 +2215,12 @@
if (flags & IEEE80211_CONF_CHANGE_CHANNEL) {
rt2800_config_channel(rt2x00dev, libconf->conf,
&libconf->rf, &libconf->channel);
- rt2800_config_txpower(rt2x00dev, libconf->conf);
+ rt2800_config_txpower(rt2x00dev, libconf->conf->channel->band,
+ libconf->conf->power_level);
}
if (flags & IEEE80211_CONF_CHANGE_POWER)
- rt2800_config_txpower(rt2x00dev, libconf->conf);
+ rt2800_config_txpower(rt2x00dev, libconf->conf->channel->band,
+ libconf->conf->power_level);
if (flags & IEEE80211_CONF_CHANGE_RETRY_LIMITS)
rt2800_config_retry_limit(rt2x00dev, libconf);
if (flags & IEEE80211_CONF_CHANGE_PS)