iwlwifi: TX update chicken bits

This instructs FH to increment the retry count of a packet when
it is brought from the memory to TX-FIFO to save transactions
during aggregation flow.
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/iwlwifi/iwl-4965.c

@@ -695,6 +695,7 @@ static int iwl4965_alive_notify(struct iwl_priv *priv)
 	unsigned long flags;
 	int ret;
 	int i, chan;
+	u32 reg_val;
 
 	spin_lock_irqsave(&priv->lock, flags);
 
@@ -724,6 +725,11 @@ static int iwl4965_alive_notify(struct iwl_priv *priv)
 				FH_TCSR_TX_CONFIG_REG_VAL_DMA_CHNL_ENABLE |
 				FH_TCSR_TX_CONFIG_REG_VAL_DMA_CREDIT_ENABLE);
 
+	/* Update FH chicken bits */
+	reg_val = iwl_read_direct32(priv, FH_TX_CHICKEN_BITS_REG);
+	iwl_write_direct32(priv, FH_TX_CHICKEN_BITS_REG,
+			   reg_val | FH_TX_CHICKEN_BITS_SCD_AUTO_RETRY_EN);
+
 	/* Disable chain mode for all queues */
 	iwl_write_prph(priv, IWL49_SCD_QUEUECHAIN_SEL, 0);
 

drivers/net/wireless/iwlwifi/iwl-5000.c

@@ -703,6 +703,7 @@ static int iwl5000_alive_notify(struct iwl_priv *priv)
 	unsigned long flags;
 	int ret;
 	int i, chan;
+	u32 reg_val;
 
 	spin_lock_irqsave(&priv->lock, flags);
 
@@ -732,6 +733,11 @@ static int iwl5000_alive_notify(struct iwl_priv *priv)
 				FH_TCSR_TX_CONFIG_REG_VAL_DMA_CHNL_ENABLE |
 				FH_TCSR_TX_CONFIG_REG_VAL_DMA_CREDIT_ENABLE);
 
+	/* Update FH chicken bits */
+	reg_val = iwl_read_direct32(priv, FH_TX_CHICKEN_BITS_REG);
+	iwl_write_direct32(priv, FH_TX_CHICKEN_BITS_REG,
+			   reg_val | FH_TX_CHICKEN_BITS_SCD_AUTO_RETRY_EN);
+
 	iwl_write_prph(priv, IWL50_SCD_QUEUECHAIN_SEL,
 		IWL50_SCD_QUEUECHAIN_SEL_ALL(priv->hw_params.max_txq_num));
 	iwl_write_prph(priv, IWL50_SCD_AGGR_SEL, 0);

drivers/net/wireless/iwlwifi/iwl-fh.h

@@ -396,6 +396,11 @@
 #define FH_SRVC_CHNL_SRAM_ADDR_REG(_chnl) \
 		(FH_SRVC_LOWER_BOUND + ((_chnl) - 9) * 0x4)
 
+#define FH_TX_CHICKEN_BITS_REG	(FH_MEM_LOWER_BOUND + 0xE98)
+/* Instruct FH to increment the retry count of a packet when
+ * it is brought from the memory to TX-FIFO
+ */
+#define FH_TX_CHICKEN_BITS_SCD_AUTO_RETRY_EN	(0x00000002)
 
 /**
  * struct iwl_rb_status - reseve buffer status