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>

3 files changed, 17 insertions, 0 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-4965.c b/drivers/net/wireless/iwlwifi/iwl-4965.c
index 60769b12b685..ab0b40531989 100644
--- a/drivers/net/wireless/iwlwifi/iwl-4965.c
+++ b/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);
 
diff --git a/drivers/net/wireless/iwlwifi/iwl-5000.c b/drivers/net/wireless/iwlwifi/iwl-5000.c
index d73760c3f769..a738886b434f 100644
--- a/drivers/net/wireless/iwlwifi/iwl-5000.c
+++ b/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);
diff --git a/drivers/net/wireless/iwlwifi/iwl-fh.h b/drivers/net/wireless/iwlwifi/iwl-fh.h
index bc20acb36aa6..c3dadb03701c 100644
--- a/drivers/net/wireless/iwlwifi/iwl-fh.h
+++ b/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