From c9eea9dea9c31399b6c78eef87378569c26088d9 Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@openwrt.org>
Date: Sat, 8 Sep 2012 13:18:58 +0000
Subject: [PATCH] ath9k: disable PA predistortion by default, since it has been
reported to reduce rx sensitivity on some devices (#12135)
SVN-Revision: 33332
---
.../patches/565-ath9k_disable_paprd.patch | 72 +++++++++++++++++++
1 file changed, 72 insertions(+)
create mode 100644 package/mac80211/patches/565-ath9k_disable_paprd.patch
diff --git a/package/mac80211/patches/565-ath9k_disable_paprd.patch b/package/mac80211/patches/565-ath9k_disable_paprd.patch
new file mode 100644
index 0000000000..079986d601
--- /dev/null
+++ b/package/mac80211/patches/565-ath9k_disable_paprd.patch
@@ -0,0 +1,72 @@
+--- a/drivers/net/wireless/ath/ath9k/debug.c
++++ b/drivers/net/wireless/ath/ath9k/debug.c
+@@ -1767,6 +1767,8 @@ int ath9k_init_debug(struct ath_hw *ah)
+ sc->debug.debugfs_phy, sc, &fops_tx_chainmask);
+ debugfs_create_file("disable_ani", S_IRUSR | S_IWUSR,
+ sc->debug.debugfs_phy, sc, &fops_disable_ani);
++ debugfs_create_bool("paprd", S_IRUSR | S_IWUSR, sc->debug.debugfs_phy,
++ &sc->sc_ah->config.enable_paprd);
+ debugfs_create_file("regidx", S_IRUSR | S_IWUSR, sc->debug.debugfs_phy,
+ sc, &fops_regidx);
+ debugfs_create_file("regval", S_IRUSR | S_IWUSR, sc->debug.debugfs_phy,
+--- a/drivers/net/wireless/ath/ath9k/hw.c
++++ b/drivers/net/wireless/ath/ath9k/hw.c
+@@ -2521,10 +2521,6 @@ int ath9k_hw_fill_cap_info(struct ath_hw
+ pCap->rx_status_len = sizeof(struct ar9003_rxs);
+ pCap->tx_desc_len = sizeof(struct ar9003_txc);
+ pCap->txs_len = sizeof(struct ar9003_txs);
+- if (!ah->config.paprd_disable &&
+- ah->eep_ops->get_eeprom(ah, EEP_PAPRD) &&
+- !AR_SREV_9462(ah))
+- pCap->hw_caps |= ATH9K_HW_CAP_PAPRD;
+ } else {
+ pCap->tx_desc_len = sizeof(struct ath_desc);
+ if (AR_SREV_9280_20(ah))
+--- a/drivers/net/wireless/ath/ath9k/hw.h
++++ b/drivers/net/wireless/ath/ath9k/hw.h
+@@ -236,7 +236,6 @@ enum ath9k_hw_caps {
+ ATH9K_HW_CAP_LDPC = BIT(6),
+ ATH9K_HW_CAP_FASTCLOCK = BIT(7),
+ ATH9K_HW_CAP_SGI_20 = BIT(8),
+- ATH9K_HW_CAP_PAPRD = BIT(9),
+ ATH9K_HW_CAP_ANT_DIV_COMB = BIT(10),
+ ATH9K_HW_CAP_2GHZ = BIT(11),
+ ATH9K_HW_CAP_5GHZ = BIT(12),
+@@ -287,12 +286,12 @@ struct ath9k_ops_config {
+ u8 pcie_clock_req;
+ u32 pcie_waen;
+ u8 analog_shiftreg;
+- u8 paprd_disable;
+ u32 ofdm_trig_low;
+ u32 ofdm_trig_high;
+ u32 cck_trig_high;
+ u32 cck_trig_low;
+ u32 enable_ani;
++ u32 enable_paprd;
+ int serialize_regmode;
+ bool rx_intr_mitigation;
+ bool tx_intr_mitigation;
+--- a/drivers/net/wireless/ath/ath9k/ar9003_eeprom.c
++++ b/drivers/net/wireless/ath/ath9k/ar9003_eeprom.c
+@@ -2982,6 +2982,10 @@ static u32 ath9k_hw_ar9300_get_eeprom(st
+ case EEP_RX_MASK:
+ return pBase->txrxMask & 0xf;
+ case EEP_PAPRD:
++ if (AR_SREV_9462(ah))
++ return false;
++ if (!ah->config.enable_paprd);
++ return false;
+ return !!(pBase->featureEnable & BIT(5));
+ case EEP_CHAIN_MASK_REDUCE:
+ return (pBase->miscConfiguration >> 0x3) & 0x1;
+--- a/drivers/net/wireless/ath/ath9k/link.c
++++ b/drivers/net/wireless/ath/ath9k/link.c
+@@ -423,7 +423,7 @@ set_timer:
+ cal_interval = min(cal_interval, (u32)short_cal_interval);
+
+ mod_timer(&common->ani.timer, jiffies + msecs_to_jiffies(cal_interval));
+- if ((sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_PAPRD) && ah->caldata) {
++ if (ah->eep_ops->get_eeprom(ah, EEP_PAPRD) && ah->caldata) {
+ if (!ah->caldata->paprd_done)
+ ieee80211_queue_work(sc->hw, &sc->paprd_work);
+ else if (!ah->paprd_table_write_done)
--
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