ath9k_hw: Configure appropriate Tx power when PAPRD fails

Target Tx power available in eeprom is for PAPRD. If PAPRD
fails, paprd scale factor needs to be detected from this
target tx power.

Signed-off-by: Vasanthakumar Thiagarajan <vasanth@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

5 files changed, 47 insertions, 6 deletions

diff --git a/drivers/net/wireless/ath/ath9k/ar9003_eeprom.c b/drivers/net/wireless/ath/ath9k/ar9003_eeprom.c
index 0e9ea35f2fb4..f80ec7497d0f 100644
--- a/drivers/net/wireless/ath/ath9k/ar9003_eeprom.c
+++ b/drivers/net/wireless/ath/ath9k/ar9003_eeprom.c
@@ -4743,6 +4743,16 @@ static void ar9003_hw_set_power_per_rate_table(struct ath_hw *ah,
         } /* end ctl mode checking */
 }
 
+static inline u8 mcsidx_to_tgtpwridx(unsigned int mcs_idx, u8 base_pwridx)
+{
+        u8 mod_idx = mcs_idx % 8;
+
+        if (mod_idx <= 3)
+                return mod_idx ? (base_pwridx + 1) : base_pwridx;
+        else
+                return base_pwridx + 4 * (mcs_idx / 8) + mod_idx - 2;
+}
+
 static void ath9k_hw_ar9300_set_txpower(struct ath_hw *ah,
                                         struct ath9k_channel *chan, u16 cfgCtl,
                                         u8 twiceAntennaReduction,
@@ -4755,7 +4765,7 @@ static void ath9k_hw_ar9300_set_txpower(struct ath_hw *ah,
         u8 targetPowerValT2[ar9300RateSize];
         u8 target_power_val_t2_eep[ar9300RateSize];
         unsigned int i = 0, paprd_scale_factor = 0;
-        u8 pwr_idx, min_pwridx;
+        u8 pwr_idx, min_pwridx = 0;
 
         ar9003_hw_set_target_power_eeprom(ah, chan->channel, targetPowerValT2);
 
@@ -4771,6 +4781,24 @@ static void ath9k_hw_ar9300_set_txpower(struct ath_hw *ah,
                                 le32_to_cpu(eep->modalHeader5G.papdRateMaskHt20))
                                 & AR9300_PAPRD_RATE_MASK;
 
+                paprd_scale_factor = ar9003_get_paprd_scale_factor(ah, chan);
+                min_pwridx = IS_CHAN_HT40(chan) ? ALL_TARGET_HT40_0_8_16 :
+                                                  ALL_TARGET_HT20_0_8_16;
+
+                if (!ah->paprd_table_write_done) {
+                        memcpy(target_power_val_t2_eep, targetPowerValT2,
+                               sizeof(targetPowerValT2));
+                        for (i = 0; i < 24; i++) {
+                                pwr_idx = mcsidx_to_tgtpwridx(i, min_pwridx);
+                                if (ah->paprd_ratemask & (1 << i)) {
+                                        if (targetPowerValT2[pwr_idx] &&
+                                            targetPowerValT2[pwr_idx] ==
+                                            target_power_val_t2_eep[pwr_idx])
+                                                targetPowerValT2[pwr_idx] -=
+                                                        paprd_scale_factor;
+                                }
+                        }
+                }
                 memcpy(target_power_val_t2_eep, targetPowerValT2,
                        sizeof(targetPowerValT2));
         }
@@ -4782,10 +4810,6 @@ static void ath9k_hw_ar9300_set_txpower(struct ath_hw *ah,
                                            powerLimit);
 
         if (ah->eep_ops->get_eeprom(ah, EEP_PAPRD)) {
-                paprd_scale_factor = ar9003_get_paprd_scale_factor(ah, chan);
-                min_pwridx = IS_CHAN_HT40(chan) ? ALL_TARGET_HT40_0_8_16 :
-                                                  ALL_TARGET_HT20_0_8_16;
-
                 for (i = 0; i < ar9300RateSize; i++) {
                         if ((ah->paprd_ratemask & (1 << i)) &&
                             (abs(targetPowerValT2[i] -
diff --git a/drivers/net/wireless/ath/ath9k/ar9003_paprd.c b/drivers/net/wireless/ath/ath9k/ar9003_paprd.c
index 26cf31cca3ac..79554c524b68 100644
--- a/drivers/net/wireless/ath/ath9k/ar9003_paprd.c
+++ b/drivers/net/wireless/ath/ath9k/ar9003_paprd.c
@@ -19,6 +19,20 @@
 
 void ar9003_paprd_enable(struct ath_hw *ah, bool val)
 {
+        struct ath_regulatory *regulatory = ath9k_hw_regulatory(ah);
+        struct ath9k_channel *chan = ah->curchan;
+
+        if (val) {
+                ah->paprd_table_write_done = true;
+
+                ah->eep_ops->set_txpower(ah, chan,
+                                ath9k_regd_get_ctl(regulatory, chan),
+                                chan->chan->max_antenna_gain * 2,
+                                chan->chan->max_power * 2,
+                                min((u32) MAX_RATE_POWER,
+                                (u32) regulatory->power_limit), false);
+        }
+
         REG_RMW_FIELD(ah, AR_PHY_PAPRD_CTRL0_B0,
                       AR_PHY_PAPRD_CTRL0_PAPRD_ENABLE, !!val);
         if (ah->caps.tx_chainmask & BIT(1))
diff --git a/drivers/net/wireless/ath/ath9k/hw.c b/drivers/net/wireless/ath/ath9k/hw.c
index 0f373be9ef8c..ddda76fcd180 100644
--- a/drivers/net/wireless/ath/ath9k/hw.c
+++ b/drivers/net/wireless/ath/ath9k/hw.c
@@ -1272,6 +1272,8 @@ int ath9k_hw_reset(struct ath_hw *ah, struct ath9k_channel *chan,
 
         ath9k_hw_mark_phy_inactive(ah);
 
+        ah->paprd_table_write_done = false;
+
         /* Only required on the first reset */
         if (AR_SREV_9271(ah) && ah->htc_reset_init) {
                 REG_WRITE(ah,
diff --git a/drivers/net/wireless/ath/ath9k/hw.h b/drivers/net/wireless/ath/ath9k/hw.h
index 3a6101ba9837..21e37d157d3a 100644
--- a/drivers/net/wireless/ath/ath9k/hw.h
+++ b/drivers/net/wireless/ath/ath9k/hw.h
@@ -836,6 +836,7 @@ struct ath_hw {
         unsigned int paprd_target_power;
         unsigned int paprd_training_power;
         unsigned int paprd_ratemask;
+        bool paprd_table_write_done;
         u32 paprd_gain_table_entries[PAPRD_GAIN_TABLE_ENTRIES];
         u8 paprd_gain_table_index[PAPRD_GAIN_TABLE_ENTRIES];
         /*
diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c
index 4d647169439c..cb53fbb951f1 100644
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -533,7 +533,7 @@ set_timer:
         if ((sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_PAPRD) && ah->caldata) {
                 if (!ah->caldata->paprd_done)
                         ieee80211_queue_work(sc->hw, &sc->paprd_work);
-                else
+                else if (!ah->paprd_table_write_done)
                         ath_paprd_activate(sc);
         }
 }