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>

1 files changed, 5 insertions, 1 deletions

diff --git a/drivers/net/wireless/ath/ath9k/hw.c b/drivers/net/wireless/ath/ath9k/hw.c
index 1afb8bb85756..9f01e50d5cda 100644
--- 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);