rt2800: use BBP_R1 for setting tx power

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>

1 files changed, 19 insertions, 8 deletions

diff --git a/drivers/net/wireless/rt2x00/rt2800lib.c b/drivers/net/wireless/rt2x00/rt2800lib.c
index 01dc8891070c..934dd9d9d4dc 100644
--- a/drivers/net/wireless/rt2x00/rt2800lib.c
+++ b/drivers/net/wireless/rt2x00/rt2800lib.c
@@ -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;