ath9k_hw: disabled PAPRD for AR9003

AR9003's PAPRD was enabled prematurely, and is causing some
large discrepancies on throughput and network connectivity.
For example downlink (RX) throughput against an AR9280 AP
can vary widlely from 43-73 Mbit/s while disabling this
gets AR9382 (2x2) up to around 93 Mbit/s in a 2.4 GHz HT20 setup.

Cc: stable@kernel.org
Cc: Paul Shaw <paul.shaw@atheros.com>
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/hw.c b/drivers/net/wireless/ath/ath9k/hw.c
index 1afb8bb85756ee55e5a2a82d5f1f825279c803ea..9f01e50d5cda718e391f9582f71064f82c5f8733 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/hw.c
+++ b/drivers/net/wireless/ath/ath9k/hw.c
@@ -369,6 +369,9 @@ static void ath9k_hw_init_config(struct ath_hw *ah)
        else
                ah->config.ht_enable = 0;
 
+       /* PAPRD needs some more work to be enabled */
+       ah->config.paprd_disable = 1;
+
        ah->config.rx_intr_mitigation = true;
        ah->config.pcieSerDesWrite = true;
 
@@ -1933,7 +1936,8 @@ int ath9k_hw_fill_cap_info(struct ath_hw *ah)
                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->eep_ops->get_eeprom(ah, EEP_PAPRD))
+               if (!ah->config.paprd_disable &&
+                   ah->eep_ops->get_eeprom(ah, EEP_PAPRD))
                        pCap->hw_caps |= ATH9K_HW_CAP_PAPRD;
        } else {
                pCap->tx_desc_len = sizeof(struct ath_desc);

diff --git a/drivers/net/wireless/ath/ath9k/hw.h b/drivers/net/wireless/ath/ath9k/hw.h
index 5a3dfec45e96004d02c84a33cbb39ff9aa201d45..ea9fde6706461cb12560b53018ef101a87be5481 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/hw.h
+++ b/drivers/net/wireless/ath/ath9k/hw.h
@@ -225,6 +225,7 @@ struct ath9k_ops_config {
        u32 pcie_waen;
        u8 analog_shiftreg;
        u8 ht_enable;
+       u8 paprd_disable;
        u32 ofdm_trig_low;
        u32 ofdm_trig_high;
        u32 cck_trig_high;