rt2800: fix RT5390 & RT3290 TX power settings regression

My change:

commit cee2c731
Author: Stanislaw Gruszka <sgruszka@redhat.com>
Date:   Fri Oct 5 13:44:09 2012 +0200

    rt2800: use BBP_R1 for setting tx power

unfortunately does not work well with RT5390 and RT3290 chips as they
require different temperature compensation TX power settings (TSSI
tuning). Since that commit make wireless connection very unstable on
those chips, restore previous behavior to fix regression. Once we
implement proper TSSI tuning on 5390/3290 we can restore back setting
TX power by BBP_R1 register for those chips.
Reported-and-tested-by: Mike Romberg <mike-romberg@comcast.net>
Cc: stable@vger.kernel.org
Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Acked-by: Gertjan van Wingerde <gwingerde@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/rt2x00/rt2800lib.c

@@ -3027,7 +3027,12 @@ static void rt2800_config_txpower(struct rt2x00_dev *rt2x00dev,
 	 * 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.
+	 *
+	 * TODO: add different temperature compensation code for RT3290 & RT5390
+	 * to allow to use BBP_R1 for those chips.
 	 */
+	if (!rt2x00_rt(rt2x00dev, RT3290) &&
+	    !rt2x00_rt(rt2x00dev, RT5390)) {
 		rt2800_bbp_read(rt2x00dev, 1, &r1);
 		if (delta <= -12) {
 			power_ctrl = 2;
@@ -3040,6 +3045,8 @@ static void rt2800_config_txpower(struct rt2x00_dev *rt2x00dev,
 		}
 		rt2x00_set_field8(&r1, BBP1_TX_POWER_CTRL, power_ctrl);
 		rt2800_bbp_write(rt2x00dev, 1, r1);
+	}
+
 	offset = TX_PWR_CFG_0;
 
 	for (i = 0; i < EEPROM_TXPOWER_BYRATE_SIZE; i += 2) {