ath9k_hw: disabled PAPRD for AR9003
authorLuis R. Rodriguez <lrodriguez@atheros.com>
Fri, 21 Jan 2011 01:47:39 +0000 (17:47 -0800)
committerJohn W. Linville <linville@tuxdriver.com>
Fri, 21 Jan 2011 20:05:57 +0000 (15:05 -0500)
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>
drivers/net/wireless/ath/ath9k/hw.c
drivers/net/wireless/ath/ath9k/hw.h

index 1afb8bb85756ee55e5a2a82d5f1f825279c803ea..9f01e50d5cda718e391f9582f71064f82c5f8733 100644 (file)
@@ -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);
index 5a3dfec45e96004d02c84a33cbb39ff9aa201d45..ea9fde6706461cb12560b53018ef101a87be5481 100644 (file)
@@ -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;