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>

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] -

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))

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,

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];
 	/*

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);
 	}
 }