iwlwifi: MAC_ACCESS_REQ cleanup

Add txq_id info to "Tx queue requesting wakeup" debug message

Add "Rx queue requesting wakeup" debug message

Move clear of CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ to be after nearby
iwl_write_prph(), since iwl_write_prph() sets it and clears it.  Almost
removed it entirely, but just making sure in case someone removes the
iwl_write_prph()!  Also remove unneeded priv->lock usage; this is now
handled by priv->reg_lock within iwl_clear_bit().

Join a couple of lines that had unneeded line returns.

Signed-off-by: Ben Cahill <ben.m.cahill@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-agn.c

@@ -1934,19 +1934,17 @@ static void __iwl_down(struct iwl_priv *priv)
 
 	/* device going down, Stop using ICT table */
 	iwl_disable_ict(priv);
-	spin_lock_irqsave(&priv->lock, flags);
-	iwl_clear_bit(priv, CSR_GP_CNTRL,
-			 CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
-	spin_unlock_irqrestore(&priv->lock, flags);
 
 	iwl_txq_ctx_stop(priv);
 	iwl_rxq_stop(priv);
 
-	iwl_write_prph(priv, APMG_CLK_DIS_REG,
-				APMG_CLK_VAL_DMA_CLK_RQT);
-
+	/* Power-down device's busmaster DMA clocks */
+	iwl_write_prph(priv, APMG_CLK_DIS_REG, APMG_CLK_VAL_DMA_CLK_RQT);
 	udelay(5);
 
+	/* Make sure (redundant) we've released our request to stay awake */
+	iwl_clear_bit(priv, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
+
 	/* Stop the device, and put it in low power state */
 	priv->cfg->ops->lib->apm_ops.stop(priv);
 

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

@@ -140,6 +140,8 @@ int iwl_rx_queue_update_write_ptr(struct iwl_priv *priv, struct iwl_rx_queue *q)
 		reg = iwl_read32(priv, CSR_UCODE_DRV_GP1);
 
 		if (reg & CSR_UCODE_DRV_GP1_BIT_MAC_SLEEP) {
+			IWL_DEBUG_INFO(priv, "Rx queue requesting wakeup, GP1 = 0x%x\n",
+				      reg);
 			iwl_set_bit(priv, CSR_GP_CNTRL,
 				    CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
 			goto exit_unlock;

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

@@ -96,7 +96,8 @@ int iwl_txq_update_write_ptr(struct iwl_priv *priv, struct iwl_tx_queue *txq)
 		reg = iwl_read32(priv, CSR_UCODE_DRV_GP1);
 
 		if (reg & CSR_UCODE_DRV_GP1_BIT_MAC_SLEEP) {
-			IWL_DEBUG_INFO(priv, "Requesting wakeup, GP1 = 0x%x\n", reg);
+			IWL_DEBUG_INFO(priv, "Tx queue %d requesting wakeup, GP1 = 0x%x\n",
+				      txq_id, reg);
 			iwl_set_bit(priv, CSR_GP_CNTRL,
 				    CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
 			return ret;

drivers/net/wireless/iwlwifi/iwl3945-base.c

@@ -2600,9 +2600,8 @@ static void __iwl3945_down(struct iwl_priv *priv)
 	iwl3945_hw_txq_ctx_stop(priv);
 	iwl3945_hw_rxq_stop(priv);
 
-	iwl_write_prph(priv, APMG_CLK_DIS_REG,
-				APMG_CLK_VAL_DMA_CLK_RQT);
-
+	/* Power-down device's busmaster DMA clocks */
+	iwl_write_prph(priv, APMG_CLK_DIS_REG, APMG_CLK_VAL_DMA_CLK_RQT);
 	udelay(5);
 
 	/* Stop the device, and put it in low power state */