ath9k_hw: Use buffered register writes

This patch adds macros at certain places
which could be optimized for multiple register writes.

The performance of ath9k_htc improves considerably,
especially reducing the latency involved in a scan run.

Signed-off-by: Sujith <Sujith.Manoharan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 28 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath9k/ar5008_phy.c b/drivers/net/wireless/ath/ath9k/ar5008_phy.c
index 94eb069b5ae3..de8ce1291a46 100644
--- a/drivers/net/wireless/ath/ath9k/ar5008_phy.c
+++ b/drivers/net/wireless/ath/ath9k/ar5008_phy.c
@@ -590,10 +590,14 @@ static void ar5008_hw_init_chain_masks(struct ath_hw *ah)
         rx_chainmask = ah->rxchainmask;
         tx_chainmask = ah->txchainmask;
 
+        ENABLE_REGWRITE_BUFFER(ah);
+
         switch (rx_chainmask) {
         case 0x5:
+                DISABLE_REGWRITE_BUFFER(ah);
                 REG_SET_BIT(ah, AR_PHY_ANALOG_SWAP,
                             AR_PHY_SWAP_ALT_CHAIN);
+                ENABLE_REGWRITE_BUFFER(ah);
         case 0x3:
                 if (ah->hw_version.macVersion == AR_SREV_REVISION_5416_10) {
                         REG_WRITE(ah, AR_PHY_RX_CHAINMASK, 0x7);
@@ -611,6 +615,10 @@ static void ar5008_hw_init_chain_masks(struct ath_hw *ah)
         }
 
         REG_WRITE(ah, AR_SELFGEN_MASK, tx_chainmask);
+
+        REGWRITE_BUFFER_FLUSH(ah);
+        DISABLE_REGWRITE_BUFFER(ah);
+
         if (tx_chainmask == 0x5) {
                 REG_SET_BIT(ah, AR_PHY_ANALOG_SWAP,
                             AR_PHY_SWAP_ALT_CHAIN);
@@ -689,8 +697,13 @@ static void ar5008_hw_set_channel_regs(struct ath_hw *ah,
 
         ath9k_hw_set11nmac2040(ah);
 
+        ENABLE_REGWRITE_BUFFER(ah);
+
         REG_WRITE(ah, AR_GTXTO, 25 << AR_GTXTO_TIMEOUT_LIMIT_S);
         REG_WRITE(ah, AR_CST, 0xF << AR_CST_TIMEOUT_LIMIT_S);
+
+        REGWRITE_BUFFER_FLUSH(ah);
+        DISABLE_REGWRITE_BUFFER(ah);
 }
 
 
@@ -773,6 +786,8 @@ static int ar5008_hw_process_ini(struct ath_hw *ah,
 
         REG_WRITE(ah, AR_PHY_ADC_SERIAL_CTL, AR_PHY_SEL_INTERNAL_ADDAC);
 
+        ENABLE_REGWRITE_BUFFER(ah);
+
         for (i = 0; i < ah->iniModes.ia_rows; i++) {
                 u32 reg = INI_RA(&ah->iniModes, i, 0);
                 u32 val = INI_RA(&ah->iniModes, i, modesIndex);
@@ -790,6 +805,9 @@ static int ar5008_hw_process_ini(struct ath_hw *ah,
                 DO_DELAY(regWrites);
         }
 
+        REGWRITE_BUFFER_FLUSH(ah);
+        DISABLE_REGWRITE_BUFFER(ah);
+
         if (AR_SREV_9280(ah) || AR_SREV_9287_10_OR_LATER(ah))
                 REG_WRITE_ARRAY(&ah->iniModesRxGain, modesIndex, regWrites);
 
@@ -801,6 +819,8 @@ static int ar5008_hw_process_ini(struct ath_hw *ah,
                 REG_WRITE_ARRAY(&ah->iniModes_9271_1_0_only,
                                 modesIndex, regWrites);
 
+        ENABLE_REGWRITE_BUFFER(ah);
+
         /* Write common array parameters */
         for (i = 0; i < ah->iniCommon.ia_rows; i++) {
                 u32 reg = INI_RA(&ah->iniCommon, i, 0);
@@ -816,6 +836,9 @@ static int ar5008_hw_process_ini(struct ath_hw *ah,
                 DO_DELAY(regWrites);
         }
 
+        REGWRITE_BUFFER_FLUSH(ah);
+        DISABLE_REGWRITE_BUFFER(ah);
+
         if (AR_SREV_9271(ah)) {
                 if (ah->eep_ops->get_eeprom(ah, EEP_TXGAIN_TYPE) == 1)
                         REG_WRITE_ARRAY(&ah->iniModes_high_power_tx_gain_9271,
@@ -1303,6 +1326,8 @@ static void ar5008_hw_loadnf(struct ath_hw *ah, struct ath9k_channel *chan)
                 udelay(50);
         }
 
+        ENABLE_REGWRITE_BUFFER(ah);
+
         for (i = 0; i < NUM_NF_READINGS; i++) {
                 if (chainmask & (1 << i)) {
                         val = REG_READ(ah, ar5416_cca_regs[i]);
@@ -1311,6 +1336,9 @@ static void ar5008_hw_loadnf(struct ath_hw *ah, struct ath9k_channel *chan)
                         REG_WRITE(ah, ar5416_cca_regs[i], val);
                 }
         }
+
+        REGWRITE_BUFFER_FLUSH(ah);
+        DISABLE_REGWRITE_BUFFER(ah);
 }
 
 void ar5008_hw_attach_phy_ops(struct ath_hw *ah)