ath9k_hw: disabled PAPRD for AR9003

commit 6f4810101a629b31b5427872a09ea092cfc5c4bd upstream.

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: Paul Shaw <paul.shaw@atheros.com>
Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/net/wireless/ath/ath9k/hw.c b/drivers/net/wireless/ath/ath9k/hw.c
index c7fbe25cc12827cf29f68729fe636b07ef75ebfa..5dcf14005576a37e75ccf6363401ac34c87ea95c 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/hw.c
+++ b/drivers/net/wireless/ath/ath9k/hw.c
@@ -385,6 +385,9 @@ 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;
 
@@ -1949,7 +1952,8 @@ 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 d47d1b4b6002f2650cba8c80401cd52089800cc6..1240376e29bd457ad0415ad33c138907b04e8130 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/hw.h
+++ b/drivers/net/wireless/ath/ath9k/hw.h
@@ -215,6 +215,7 @@ 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;