ath9k_hw: clean up register write buffering

Throughout the code, DISABLE_REGWRITE_BUFFER is always called right after
REGWRITE_BUFFER_FLUSH. Since that's unlikely to change any time soon, that
makes keeping those ops separate rather pointless, as it only increases
code size and line number counts.
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/ath.h

@@ -102,14 +102,12 @@ enum ath_cipher {
  * @read: Register read
  * @write: Register write
  * @enable_write_buffer: Enable multiple register writes
- * @disable_write_buffer: Disable multiple register writes
- * @write_flush: Flush buffered register writes
+ * @write_flush: flush buffered register writes and disable buffering
  */
 struct ath_ops {
 	unsigned int (*read)(void *, u32 reg_offset);
 	void (*write)(void *, u32 val, u32 reg_offset);
 	void (*enable_write_buffer)(void *);
-	void (*disable_write_buffer)(void *);
 	void (*write_flush) (void *);
 };
 

drivers/net/wireless/ath/ath9k/ani.c

@@ -180,7 +180,6 @@ static void ath9k_ani_restart_old(struct ath_hw *ah)
 	REG_WRITE(ah, AR_PHY_ERR_MASK_2, AR_PHY_ERR_CCK_TIMING);
 
 	REGWRITE_BUFFER_FLUSH(ah);
-	DISABLE_REGWRITE_BUFFER(ah);
 
 	ath9k_hw_update_mibstats(ah, &ah->ah_mibStats);
 
@@ -215,7 +214,6 @@ static void ath9k_ani_restart_new(struct ath_hw *ah)
 	REG_WRITE(ah, AR_PHY_ERR_MASK_2, AR_PHY_ERR_CCK_TIMING);
 
 	REGWRITE_BUFFER_FLUSH(ah);
-	DISABLE_REGWRITE_BUFFER(ah);
 
 	ath9k_hw_update_mibstats(ah, &ah->ah_mibStats);
 
@@ -643,7 +641,6 @@ static void ath9k_ani_reset_old(struct ath_hw *ah, bool is_scanning)
 	REG_WRITE(ah, AR_PHY_ERR_MASK_2, AR_PHY_ERR_CCK_TIMING);
 
 	REGWRITE_BUFFER_FLUSH(ah);
-	DISABLE_REGWRITE_BUFFER(ah);
 }
 
 /*
@@ -737,7 +734,6 @@ static void ath9k_ani_reset_new(struct ath_hw *ah, bool is_scanning)
 	REG_WRITE(ah, AR_PHY_ERR_MASK_2, AR_PHY_ERR_CCK_TIMING);
 
 	REGWRITE_BUFFER_FLUSH(ah);
-	DISABLE_REGWRITE_BUFFER(ah);
 }
 
 static void ath9k_hw_ani_monitor_old(struct ath_hw *ah,
@@ -991,7 +987,6 @@ void ath9k_enable_mib_counters(struct ath_hw *ah)
 	REG_WRITE(ah, AR_PHY_ERR_MASK_2, AR_PHY_ERR_CCK_TIMING);
 
 	REGWRITE_BUFFER_FLUSH(ah);
-	DISABLE_REGWRITE_BUFFER(ah);
 }
 
 /* Freeze the MIB counters, get the stats and then clear them */
@@ -1261,7 +1256,6 @@ void ath9k_hw_ani_init(struct ath_hw *ah)
 	REG_WRITE(ah, AR_PHY_ERR_2, ah->ani[0].cckPhyErrBase);
 
 	REGWRITE_BUFFER_FLUSH(ah);
-	DISABLE_REGWRITE_BUFFER(ah);
 
 	ath9k_enable_mib_counters(ah);
 

drivers/net/wireless/ath/ath9k/ar5008_phy.c

@@ -613,14 +613,11 @@ 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);
@@ -630,17 +627,18 @@ static void ar5008_hw_init_chain_masks(struct ath_hw *ah)
 	case 0x1:
 	case 0x2:
 	case 0x7:
+		ENABLE_REGWRITE_BUFFER(ah);
 		REG_WRITE(ah, AR_PHY_RX_CHAINMASK, rx_chainmask);
 		REG_WRITE(ah, AR_PHY_CAL_CHAINMASK, rx_chainmask);
 		break;
 	default:
+		ENABLE_REGWRITE_BUFFER(ah);
 		break;
 	}
 
 	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,
@@ -726,7 +724,6 @@ static void ar5008_hw_set_channel_regs(struct ath_hw *ah,
 	REG_WRITE(ah, AR_CST, 0xF << AR_CST_TIMEOUT_LIMIT_S);
 
 	REGWRITE_BUFFER_FLUSH(ah);
-	DISABLE_REGWRITE_BUFFER(ah);
 }
 
 
@@ -818,7 +815,6 @@ static int ar5008_hw_process_ini(struct ath_hw *ah,
 	}
 
 	REGWRITE_BUFFER_FLUSH(ah);
-	DISABLE_REGWRITE_BUFFER(ah);
 
 	if (AR_SREV_9280(ah) || AR_SREV_9287_11_OR_LATER(ah))
 		REG_WRITE_ARRAY(&ah->iniModesRxGain, modesIndex, regWrites);
@@ -849,7 +845,6 @@ static int ar5008_hw_process_ini(struct ath_hw *ah,
 	}
 
 	REGWRITE_BUFFER_FLUSH(ah);
-	DISABLE_REGWRITE_BUFFER(ah);
 
 	if (AR_SREV_9271(ah)) {
 		if (ah->eep_ops->get_eeprom(ah, EEP_TXGAIN_TYPE) == 1)

drivers/net/wireless/ath/ath9k/ar9002_calib.c

@@ -522,7 +522,6 @@ static void ar9271_hw_pa_cal(struct ath_hw *ah, bool is_reset)
 		REG_WRITE(ah, regList[i][0], regList[i][1]);
 
 	REGWRITE_BUFFER_FLUSH(ah);
-	DISABLE_REGWRITE_BUFFER(ah);
 }
 
 static inline void ar9285_hw_pa_cal(struct ath_hw *ah, bool is_reset)

drivers/net/wireless/ath/ath9k/ar9002_hw.c

@@ -371,7 +371,6 @@ static void ar9002_hw_configpcipowersave(struct ath_hw *ah,
 			REG_WRITE(ah, AR_PCIE_SERDES2, 0x00000000);
 
 			REGWRITE_BUFFER_FLUSH(ah);
-			DISABLE_REGWRITE_BUFFER(ah);
 		}
 
 		udelay(1000);
@@ -468,7 +467,6 @@ static int ar9002_hw_get_radiorev(struct ath_hw *ah)
 		REG_WRITE(ah, AR_PHY(0x20), 0x00010000);
 
 	REGWRITE_BUFFER_FLUSH(ah);
-	DISABLE_REGWRITE_BUFFER(ah);
 
 	val = (REG_READ(ah, AR_PHY(256)) >> 24) & 0xff;
 	val = ((val & 0xf0) >> 4) | ((val & 0x0f) << 4);
@@ -627,6 +625,4 @@ void ar9002_hw_load_ani_reg(struct ath_hw *ah, struct ath9k_channel *chan)
 	}
 
 	REGWRITE_BUFFER_FLUSH(ah);
-	DISABLE_REGWRITE_BUFFER(ah);
-
 }

drivers/net/wireless/ath/ath9k/ar9002_phy.c

@@ -415,7 +415,6 @@ static void ar9002_hw_spur_mitigate(struct ath_hw *ah,
 	REG_WRITE(ah, AR_PHY_MASK2_P_61_45, tmp_mask);
 
 	REGWRITE_BUFFER_FLUSH(ah);
-	DISABLE_REGWRITE_BUFFER(ah);
 }
 
 static void ar9002_olc_init(struct ath_hw *ah)

drivers/net/wireless/ath/ath9k/calib.c

@@ -300,7 +300,6 @@ void ath9k_hw_loadnf(struct ath_hw *ah, struct ath9k_channel *chan)
 		}
 	}
 	REGWRITE_BUFFER_FLUSH(ah);
-	DISABLE_REGWRITE_BUFFER(ah);
 }
 
 

drivers/net/wireless/ath/ath9k/eeprom_4k.c

@@ -508,7 +508,6 @@ static void ath9k_hw_set_4k_power_cal_table(struct ath_hw *ah,
 			}
 
 			REGWRITE_BUFFER_FLUSH(ah);
-			DISABLE_REGWRITE_BUFFER(ah);
 		}
 	}
 
@@ -840,7 +839,6 @@ static void ath9k_hw_4k_set_txpower(struct ath_hw *ah,
 	}
 
 	REGWRITE_BUFFER_FLUSH(ah);
-	DISABLE_REGWRITE_BUFFER(ah);
 }
 
 static void ath9k_hw_4k_set_addac(struct ath_hw *ah,

drivers/net/wireless/ath/ath9k/htc_drv_init.c

@@ -380,15 +380,6 @@ static void ath9k_enable_regwrite_buffer(void *hw_priv)
 	atomic_inc(&priv->wmi->mwrite_cnt);
 }
 
-static void ath9k_disable_regwrite_buffer(void *hw_priv)
-{
-	struct ath_hw *ah = (struct ath_hw *) hw_priv;
-	struct ath_common *common = ath9k_hw_common(ah);
-	struct ath9k_htc_priv *priv = (struct ath9k_htc_priv *) common->priv;
-
-	atomic_dec(&priv->wmi->mwrite_cnt);
-}
-
 static void ath9k_regwrite_flush(void *hw_priv)
 {
 	struct ath_hw *ah = (struct ath_hw *) hw_priv;
@@ -397,6 +388,8 @@ static void ath9k_regwrite_flush(void *hw_priv)
 	u32 rsp_status;
 	int r;
 
+	atomic_dec(&priv->wmi->mwrite_cnt);
+
 	mutex_lock(&priv->wmi->multi_write_mutex);
 
 	if (priv->wmi->multi_write_idx) {
@@ -420,7 +413,6 @@ static const struct ath_ops ath9k_common_ops = {
 	.read = ath9k_regread,
 	.write = ath9k_regwrite,
 	.enable_write_buffer = ath9k_enable_regwrite_buffer,
-	.disable_write_buffer = ath9k_disable_regwrite_buffer,
 	.write_flush = ath9k_regwrite_flush,
 };
 

drivers/net/wireless/ath/ath9k/hw.c

@@ -299,7 +299,6 @@ static void ath9k_hw_disablepcie(struct ath_hw *ah)
 	REG_WRITE(ah, AR_PCIE_SERDES2, 0x00000000);
 
 	REGWRITE_BUFFER_FLUSH(ah);
-	DISABLE_REGWRITE_BUFFER(ah);
 }
 
 /* This should work for all families including legacy */
@@ -676,7 +675,6 @@ static void ath9k_hw_init_qos(struct ath_hw *ah)
 	REG_WRITE(ah, AR_TXOP_12_15, 0xFFFFFFFF);
 
 	REGWRITE_BUFFER_FLUSH(ah);
-	DISABLE_REGWRITE_BUFFER(ah);
 }
 
 static void ath9k_hw_init_pll(struct ath_hw *ah,
@@ -741,7 +739,6 @@ static void ath9k_hw_init_interrupt_masks(struct ath_hw *ah,
 	}
 
 	REGWRITE_BUFFER_FLUSH(ah);
-	DISABLE_REGWRITE_BUFFER(ah);
 
 	if (AR_SREV_9300_20_OR_LATER(ah)) {
 		REG_WRITE(ah, AR_INTR_PRIO_ASYNC_ENABLE, 0);
@@ -885,7 +882,6 @@ static inline void ath9k_hw_set_dma(struct ath_hw *ah)
 	REG_WRITE(ah, AR_TXCFG, regval | AR_TXCFG_DMASZ_128B);
 
 	REGWRITE_BUFFER_FLUSH(ah);
-	DISABLE_REGWRITE_BUFFER(ah);
 
 	/*
 	 * Restore TX Trigger Level to its pre-reset value.
@@ -933,7 +929,6 @@ static inline void ath9k_hw_set_dma(struct ath_hw *ah)
 	}
 
 	REGWRITE_BUFFER_FLUSH(ah);
-	DISABLE_REGWRITE_BUFFER(ah);
 
 	if (AR_SREV_9300_20_OR_LATER(ah))
 		ath9k_hw_reset_txstatus_ring(ah);
@@ -1031,7 +1026,6 @@ static bool ath9k_hw_set_reset(struct ath_hw *ah, int type)
 	REG_WRITE(ah, AR_RTC_RC, rst_flags);
 
 	REGWRITE_BUFFER_FLUSH(ah);
-	DISABLE_REGWRITE_BUFFER(ah);
 
 	udelay(50);
 
@@ -1070,7 +1064,6 @@ static bool ath9k_hw_set_reset_power_on(struct ath_hw *ah)
 	udelay(2);
 
 	REGWRITE_BUFFER_FLUSH(ah);
-	DISABLE_REGWRITE_BUFFER(ah);
 
 	if (!AR_SREV_9300_20_OR_LATER(ah))
 		udelay(2);
@@ -1374,7 +1367,6 @@ int ath9k_hw_reset(struct ath_hw *ah, struct ath9k_channel *chan,
 	REG_WRITE(ah, AR_RSSI_THR, INIT_RSSI_THR);
 
 	REGWRITE_BUFFER_FLUSH(ah);
-	DISABLE_REGWRITE_BUFFER(ah);
 
 	r = ath9k_hw_rf_set_freq(ah, chan);
 	if (r)
@@ -1386,7 +1378,6 @@ int ath9k_hw_reset(struct ath_hw *ah, struct ath9k_channel *chan,
 		REG_WRITE(ah, AR_DQCUMASK(i), 1 << i);
 
 	REGWRITE_BUFFER_FLUSH(ah);
-	DISABLE_REGWRITE_BUFFER(ah);
 
 	ah->intr_txqs = 0;
 	for (i = 0; i < ah->caps.total_queues; i++)
@@ -1434,7 +1425,6 @@ int ath9k_hw_reset(struct ath_hw *ah, struct ath9k_channel *chan,
 	REG_WRITE(ah, AR_CFG_LED, saveLedState | AR_CFG_SCLK_32KHZ);
 
 	REGWRITE_BUFFER_FLUSH(ah);
-	DISABLE_REGWRITE_BUFFER(ah);
 
 	/*
 	 * For big endian systems turn on swapping for descriptors
@@ -1684,7 +1674,6 @@ void ath9k_hw_beaconinit(struct ath_hw *ah, u32 next_beacon, u32 beacon_period)
 	REG_WRITE(ah, AR_NDP_PERIOD, TU_TO_USEC(beacon_period));
 
 	REGWRITE_BUFFER_FLUSH(ah);
-	DISABLE_REGWRITE_BUFFER(ah);
 
 	beacon_period &= ~ATH9K_BEACON_ENA;
 	if (beacon_period & ATH9K_BEACON_RESET_TSF) {
@@ -1712,7 +1701,6 @@ void ath9k_hw_set_sta_beacon_timers(struct ath_hw *ah,
 		  TU_TO_USEC(bs->bs_intval & ATH9K_BEACON_PERIOD));
 
 	REGWRITE_BUFFER_FLUSH(ah);
-	DISABLE_REGWRITE_BUFFER(ah);
 
 	REG_RMW_FIELD(ah, AR_RSSI_THR,
 		      AR_RSSI_THR_BM_THR, bs->bs_bmissthreshold);
@@ -1758,7 +1746,6 @@ void ath9k_hw_set_sta_beacon_timers(struct ath_hw *ah,
 	REG_WRITE(ah, AR_DTIM_PERIOD, TU_TO_USEC(dtimperiod));
 
 	REGWRITE_BUFFER_FLUSH(ah);
-	DISABLE_REGWRITE_BUFFER(ah);
 
 	REG_SET_BIT(ah, AR_TIMER_MODE,
 		    AR_TBTT_TIMER_EN | AR_TIM_TIMER_EN |
@@ -2176,7 +2163,6 @@ void ath9k_hw_setrxfilter(struct ath_hw *ah, u32 bits)
 			  REG_READ(ah, AR_RXCFG) & ~AR_RXCFG_ZLFDMA);
 
 	REGWRITE_BUFFER_FLUSH(ah);
-	DISABLE_REGWRITE_BUFFER(ah);
 }
 EXPORT_SYMBOL(ath9k_hw_setrxfilter);
 

drivers/net/wireless/ath/ath9k/hw.h

@@ -70,19 +70,13 @@
 
 #define ENABLE_REGWRITE_BUFFER(_ah)					\
 	do {								\
-		if (AR_SREV_9271(_ah))					\
+		if (ath9k_hw_common(_ah)->ops->enable_write_buffer)	\
 			ath9k_hw_common(_ah)->ops->enable_write_buffer((_ah)); \
 	} while (0)
 
-#define DISABLE_REGWRITE_BUFFER(_ah)					\
-	do {								\
-		if (AR_SREV_9271(_ah))					\
-			ath9k_hw_common(_ah)->ops->disable_write_buffer((_ah)); \
-	} while (0)
-
 #define REGWRITE_BUFFER_FLUSH(_ah)					\
 	do {								\
-		if (AR_SREV_9271(_ah))					\
+		if (ath9k_hw_common(_ah)->ops->write_flush)		\
 			ath9k_hw_common(_ah)->ops->write_flush((_ah));	\
 	} while (0)
 

drivers/net/wireless/ath/ath9k/mac.c

@@ -40,7 +40,6 @@ static void ath9k_hw_set_txq_interrupts(struct ath_hw *ah,
 	REG_WRITE(ah, AR_IMR_S2, ah->imrs2_reg);
 
 	REGWRITE_BUFFER_FLUSH(ah);
-	DISABLE_REGWRITE_BUFFER(ah);
 }
 
 u32 ath9k_hw_gettxbuf(struct ath_hw *ah, u32 q)
@@ -530,7 +529,6 @@ bool ath9k_hw_resettxqueue(struct ath_hw *ah, u32 q)
 	}
 
 	REGWRITE_BUFFER_FLUSH(ah);
-	DISABLE_REGWRITE_BUFFER(ah);
 
 	if (qi->tqi_qflags & TXQ_FLAG_FRAG_BURST_BACKOFF_ENABLE) {
 		REG_WRITE(ah, AR_DMISC(q),
@@ -553,7 +551,6 @@ bool ath9k_hw_resettxqueue(struct ath_hw *ah, u32 q)
 			  | AR_D_MISC_POST_FR_BKOFF_DIS);
 
 		REGWRITE_BUFFER_FLUSH(ah);
-		DISABLE_REGWRITE_BUFFER(ah);
 
 		/*
 		 * cwmin and cwmax should be 0 for beacon queue
@@ -585,7 +582,6 @@ bool ath9k_hw_resettxqueue(struct ath_hw *ah, u32 q)
 			     AR_D_MISC_ARB_LOCKOUT_CNTRL_S));
 
 		REGWRITE_BUFFER_FLUSH(ah);
-		DISABLE_REGWRITE_BUFFER(ah);
 
 		break;
 	case ATH9K_TX_QUEUE_PSPOLL: