b43: N-PHY: adjust gain table

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 57 insertions, 1 deletions

diff --git a/drivers/net/wireless/b43/phy_n.c b/drivers/net/wireless/b43/phy_n.c
index 1952acc3c385..30f8bf24ac69 100644
--- a/drivers/net/wireless/b43/phy_n.c
+++ b/drivers/net/wireless/b43/phy_n.c
@@ -837,6 +837,62 @@ static void b43_nphy_spur_workaround(struct b43_wldev *dev)
                 b43_nphy_stay_in_carrier_search(dev, 0);
 }
 
+/* http://bcm-v4.sipsolutions.net/802.11/PHY/N/AdjustLnaGainTbl */
+static void b43_nphy_adjust_lna_gain_table(struct b43_wldev *dev)
+{
+        struct b43_phy_n *nphy = dev->phy.n;
+
+        u8 i;
+        s16 tmp;
+        u16 data[4];
+        s16 gain[2];
+        u16 minmax[2];
+        u16 lna_gain[4] = { -2, 10, 19, 25 };
+
+        if (nphy->hang_avoid)
+                b43_nphy_stay_in_carrier_search(dev, 1);
+
+        if (nphy->gain_boost) {
+                if (b43_current_band(dev->wl) == IEEE80211_BAND_2GHZ) {
+                        gain[0] = 6;
+                        gain[1] = 6;
+                } else {
+                        tmp = 40370 - 315 * nphy->radio_chanspec.channel;
+                        gain[0] = ((tmp >> 13) + ((tmp >> 12) & 1));
+                        tmp = 23242 - 224 * nphy->radio_chanspec.channel;
+                        gain[1] = ((tmp >> 13) + ((tmp >> 12) & 1));
+                }
+        } else {
+                gain[0] = 0;
+                gain[1] = 0;
+        }
+
+        for (i = 0; i < 2; i++) {
+                if (nphy->elna_gain_config) {
+                        data[0] = 19 + gain[i];
+                        data[1] = 25 + gain[i];
+                        data[2] = 25 + gain[i];
+                        data[3] = 25 + gain[i];
+                } else {
+                        data[0] = lna_gain[0] + gain[i];
+                        data[1] = lna_gain[1] + gain[i];
+                        data[2] = lna_gain[2] + gain[i];
+                        data[3] = lna_gain[3] + gain[i];
+                }
+                b43_ntab_write_bulk(dev, B43_NTAB16(10, 8), 4, data);
+
+                minmax[i] = 23 + gain[i];
+        }
+
+        b43_phy_maskset(dev, B43_NPHY_C1_MINMAX_GAIN, ~B43_NPHY_C1_MINGAIN,
+                                minmax[0] << B43_NPHY_C1_MINGAIN_SHIFT);
+        b43_phy_maskset(dev, B43_NPHY_C2_MINMAX_GAIN, ~B43_NPHY_C2_MINGAIN,
+                                minmax[1] << B43_NPHY_C2_MINGAIN_SHIFT);
+
+        if (nphy->hang_avoid)
+                b43_nphy_stay_in_carrier_search(dev, 0);
+}
+
 /* http://bcm-v4.sipsolutions.net/802.11/PHY/N/WorkaroundsGainCtrl */
 static void b43_nphy_gain_crtl_workarounds(struct b43_wldev *dev)
 {
@@ -921,7 +977,7 @@ static void b43_nphy_gain_crtl_workarounds(struct b43_wldev *dev)
                 b43_phy_write(dev, B43_NPHY_TABLE_DATALO,
                                         (code << 8 | 0x7C));
 
-                /* TODO: b43_nphy_adjust_lna_gain_table(dev); */
+                b43_nphy_adjust_lna_gain_table(dev);
 
                 if (nphy->elna_gain_config) {
                         b43_phy_write(dev, B43_NPHY_TABLE_ADDR, 0x0808);