ath9k_hw: Implement spur mitigation on AR9003

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/ath/ath9k/ar9003_phy.c b/drivers/net/wireless/ath/ath9k/ar9003_phy.c
index 9767265..3e3472e 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/ar9003_phy.c
+++ b/drivers/net/wireless/ath/ath9k/ar9003_phy.c
@@ -106,7 +106,55 @@ static int ar9003_hw_set_channel(struct ath_hw *ah, struct ath9k_channel *chan)
 static void ar9003_hw_spur_mitigate(struct ath_hw *ah,
                                    struct ath9k_channel *chan)
 {
-       /* TODO */
+       u32 spur_freq[4] = { 2420, 2440, 2464, 2480 };
+       int cur_bb_spur, negative = 0, cck_spur_freq;
+       int i;
+
+       /*
+        * Need to verify range +/- 10 MHz in control channel, otherwise spur
+        * is out-of-band and can be ignored.
+        */
+
+       for (i = 0; i < 4; i++) {
+               negative = 0;
+               cur_bb_spur = spur_freq[i] - chan->channel;
+
+               if (cur_bb_spur < 0) {
+                       negative = 1;
+                       cur_bb_spur = -cur_bb_spur;
+               }
+               if (cur_bb_spur < 10) {
+                       cck_spur_freq = (int)((cur_bb_spur << 19) / 11);
+
+                       if (negative == 1)
+                               cck_spur_freq = -cck_spur_freq;
+
+                       cck_spur_freq = cck_spur_freq & 0xfffff;
+
+                       REG_RMW_FIELD(ah, AR_PHY_AGC_CONTROL,
+                                     AR_PHY_AGC_CONTROL_YCOK_MAX, 0x7);
+                       REG_RMW_FIELD(ah, AR_PHY_CCK_SPUR_MIT,
+                                     AR_PHY_CCK_SPUR_MIT_SPUR_RSSI_THR, 0x7f);
+                       REG_RMW_FIELD(ah, AR_PHY_CCK_SPUR_MIT,
+                                     AR_PHY_CCK_SPUR_MIT_SPUR_FILTER_TYPE,
+                                     0x2);
+                       REG_RMW_FIELD(ah, AR_PHY_CCK_SPUR_MIT,
+                                     AR_PHY_CCK_SPUR_MIT_USE_CCK_SPUR_MIT,
+                                     0x1);
+                       REG_RMW_FIELD(ah, AR_PHY_CCK_SPUR_MIT,
+                                     AR_PHY_CCK_SPUR_MIT_CCK_SPUR_FREQ,
+                                     cck_spur_freq);
+
+                       return;
+               }
+       }
+
+       REG_RMW_FIELD(ah, AR_PHY_AGC_CONTROL,
+                     AR_PHY_AGC_CONTROL_YCOK_MAX, 0x5);
+       REG_RMW_FIELD(ah, AR_PHY_CCK_SPUR_MIT,
+                     AR_PHY_CCK_SPUR_MIT_USE_CCK_SPUR_MIT, 0x0);
+       REG_RMW_FIELD(ah, AR_PHY_CCK_SPUR_MIT,
+                     AR_PHY_CCK_SPUR_MIT_CCK_SPUR_FREQ, 0x0);
 }
 
 static u32 ar9003_hw_compute_pll_control(struct ath_hw *ah,