b43: N-PHY: enable forgotten write of hw power adjust table

We've implemented table calculation, but forgot to enable writing it in
power setup function.
By the way document table layout.

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

1 files changed, 14 insertions, 2 deletions

diff --git a/drivers/net/wireless/b43/phy_n.c b/drivers/net/wireless/b43/phy_n.c
index 291b38c45420..482b31210d28 100644
--- a/drivers/net/wireless/b43/phy_n.c
+++ b/drivers/net/wireless/b43/phy_n.c
@@ -3400,6 +3400,20 @@ static void b43_nphy_tx_prepare_adjusted_power_table(struct b43_wldev *dev)
         u8 idx, delta;
         u8 i, stf_mode;
 
+        /* Array adj_pwr_tbl corresponds to the hardware table. It consists of
+         * 21 groups, each containing 4 entries.
+         *
+         * First group has entries for CCK modulation.
+         * The rest of groups has 1 entry per modulation (SISO, CDD, STBC, SDM).
+         *
+         * Group 0 is for CCK
+         * Groups 1..4 use BPSK (group per coding rate)
+         * Groups 5..8 use QPSK (group per coding rate)
+         * Groups 9..12 use 16-QAM (group per coding rate)
+         * Groups 13..16 use 64-QAM (group per coding rate)
+         * Groups 17..20 are unknown
+         */
+
         for (i = 0; i < 4; i++)
                 nphy->adj_pwr_tbl[i] = nphy->tx_power_offset[i];
 
@@ -3598,10 +3612,8 @@ static void b43_nphy_tx_power_ctl_setup(struct b43_wldev *dev)
         }
 
         b43_nphy_tx_prepare_adjusted_power_table(dev);
-        /*
         b43_ntab_write_bulk(dev, B43_NTAB16(26, 64), 84, nphy->adj_pwr_tbl);
         b43_ntab_write_bulk(dev, B43_NTAB16(27, 64), 84, nphy->adj_pwr_tbl);
-        */
 
         if (nphy->hang_avoid)
                 b43_nphy_stay_in_carrier_search(dev, false);