rt2x00: rt2800lib: fix default VGC values for RT3572 for the 5GHz band

The rt2x00 driver uses 0x22 as a default VGC value
in VGC adjustment for the RT3572 chipset. In the
Ralink DPO_RT5572_LinuxSTA_2.6.1.3_20121022 driver,
this value is only used for initialization. During
VGC adjustment, the reference driver uses different
values.

Update the 'rt2800_get_default_vgc' function to
synchronize the values with the reference driver.
Also add the missing AGC initialization code into
the 'rt2800_config_channel' function.

References:
  RT35xx_SetAGCInitValue in chip/rt35xx.c
  RT35xx_ChipAGCAdjust in chip/rt35xx.c

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
Acked-by: Stanislaw Gruszka <stf_xl@wp.pl>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 11 insertions, 4 deletions

diff --git a/drivers/net/wireless/rt2x00/rt2800lib.c b/drivers/net/wireless/rt2x00/rt2800lib.c
index 47ef81ba605d..3ea1b96204fa 100644
--- a/drivers/net/wireless/rt2x00/rt2800lib.c
+++ b/drivers/net/wireless/rt2x00/rt2800lib.c
@@ -3310,9 +3310,18 @@ static void rt2800_config_channel(struct rt2x00_dev *rt2x00dev,
 
         rt2800_register_write(rt2x00dev, TX_PIN_CFG, tx_pin);
 
-        if (rt2x00_rt(rt2x00dev, RT3572))
+        if (rt2x00_rt(rt2x00dev, RT3572)) {
                 rt2800_rfcsr_write(rt2x00dev, 8, 0x80);
 
+                /* AGC init */
+                if (rf->channel <= 14)
+                        reg = 0x1c + (2 * rt2x00dev->lna_gain);
+                else
+                        reg = 0x22 + ((rt2x00dev->lna_gain * 5) / 3);
+
+                rt2800_bbp_write_with_rx_chain(rt2x00dev, 66, reg);
+        }
+
         if (rt2x00_rt(rt2x00dev, RT3593)) {
                 rt2800_register_read(rt2x00dev, GPIO_CTRL, &reg);
 
@@ -4421,9 +4430,7 @@ static u8 rt2800_get_default_vgc(struct rt2x00_dev *rt2x00dev)
                 else
                         vgc = 0x2e + rt2x00dev->lna_gain;
         } else { /* 5GHZ band */
-                if (rt2x00_rt(rt2x00dev, RT3572))
-                        vgc = 0x22 + (rt2x00dev->lna_gain * 5) / 3;
-                else if (rt2x00_rt(rt2x00dev, RT3593))
+                if (rt2x00_rt(rt2x00dev, RT3593))
                         vgc = 0x20 + (rt2x00dev->lna_gain * 5) / 3;
                 else if (rt2x00_rt(rt2x00dev, RT5592))
                         vgc = 0x24 + (2 * rt2x00dev->lna_gain);