ath9k_hw: Update ath9k_hw_set_dma for AR9300

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

2 files changed, 21 insertions, 3 deletions

diff --git a/drivers/net/wireless/ath/ath9k/hw.c b/drivers/net/wireless/ath/ath9k/hw.c
index ccd819a4a816..fd146c8d4cd8 100644
--- a/drivers/net/wireless/ath/ath9k/hw.c
+++ b/drivers/net/wireless/ath/ath9k/hw.c
@@ -836,13 +836,16 @@ u32 ath9k_regd_get_ctl(struct ath_regulatory *reg, struct ath9k_channel *chan)
 
 static inline void ath9k_hw_set_dma(struct ath_hw *ah)
 {
+        struct ath_common *common = ath9k_hw_common(ah);
         u32 regval;
 
         /*
          * set AHB_MODE not to do cacheline prefetches
         */
-        regval = REG_READ(ah, AR_AHB_MODE);
-        REG_WRITE(ah, AR_AHB_MODE, regval | AR_AHB_PREFETCH_RD_EN);
+        if (!AR_SREV_9300_20_OR_LATER(ah)) {
+                regval = REG_READ(ah, AR_AHB_MODE);
+                REG_WRITE(ah, AR_AHB_MODE, regval | AR_AHB_PREFETCH_RD_EN);
+        }
 
         /*
          * let mac dma reads be in 128 byte chunks
@@ -855,7 +858,8 @@ static inline void ath9k_hw_set_dma(struct ath_hw *ah)
          * The initial value depends on whether aggregation is enabled, and is
          * adjusted whenever underruns are detected.
          */
-        REG_RMW_FIELD(ah, AR_TXCFG, AR_FTRIG, ah->tx_trig_level);
+        if (!AR_SREV_9300_20_OR_LATER(ah))
+                REG_RMW_FIELD(ah, AR_TXCFG, AR_FTRIG, ah->tx_trig_level);
 
         /*
          * let mac dma writes be in 128 byte chunks
@@ -868,6 +872,14 @@ static inline void ath9k_hw_set_dma(struct ath_hw *ah)
          */
         REG_WRITE(ah, AR_RXFIFO_CFG, 0x200);
 
+        if (AR_SREV_9300_20_OR_LATER(ah)) {
+                REG_RMW_FIELD(ah, AR_RXBP_THRESH, AR_RXBP_THRESH_HP, 0x1);
+                REG_RMW_FIELD(ah, AR_RXBP_THRESH, AR_RXBP_THRESH_LP, 0x1);
+
+                ath9k_hw_set_rx_bufsize(ah, common->rx_bufsize -
+                        ah->caps.rx_status_len);
+        }
+
         /*
          * reduce the number of usable entries in PCU TXBUF to avoid
          * wrap around issues.
diff --git a/drivers/net/wireless/ath/ath9k/reg.h b/drivers/net/wireless/ath/ath9k/reg.h
index 12f16215c588..2ca478c802c4 100644
--- a/drivers/net/wireless/ath/ath9k/reg.h
+++ b/drivers/net/wireless/ath/ath9k/reg.h
@@ -39,6 +39,12 @@
 #define AR_CFG_PCI_MASTER_REQ_Q_THRESH         0x00060000
 #define AR_CFG_PCI_MASTER_REQ_Q_THRESH_S       17
 
+#define AR_RXBP_THRESH       0x0018
+#define AR_RXBP_THRESH_HP    0x0000000f
+#define AR_RXBP_THRESH_HP_S  0
+#define AR_RXBP_THRESH_LP    0x00003f00
+#define AR_RXBP_THRESH_LP_S  8
+
 #define AR_MIRT              0x0020
 #define AR_MIRT_VAL          0x0000ffff
 #define AR_MIRT_VAL_S        16