ath5k: Skip powertable setting when we are on the same channel

 * Only set power table if we are changing channel/mode
 there is no need to recalculate and reset the power table
 all the time.

 Signed-off-by: Nick Kossifidis <mickflemm@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/ath/ath5k/phy.c b/drivers/net/wireless/ath/ath5k/phy.c
index b908915..9392320 100644 (file)
--- a/drivers/net/wireless/ath/ath5k/phy.c
+++ b/drivers/net/wireless/ath/ath5k/phy.c
@@ -3090,7 +3090,7 @@ ath5k_setup_rate_powertable(struct ath5k_hw *ah, u16 max_pwr,
  */
 static int
 ath5k_hw_txpower(struct ath5k_hw *ah, struct ieee80211_channel *channel,
-               u8 ee_mode, u8 txpower)
+               u8 ee_mode, u8 txpower, bool fast)
 {
        struct ath5k_rate_pcal_info rate_info;
        u8 type;
@@ -3126,10 +3126,15 @@ ath5k_hw_txpower(struct ath5k_hw *ah, struct ieee80211_channel *channel,
                return -EINVAL;
        }
 
-       /* FIXME: Only on channel/mode change */
-       ret = ath5k_setup_channel_powertable(ah, channel, ee_mode, type);
-       if (ret)
-               return ret;
+       /* If fast is set it means we are on the same channel/mode
+        * so there is no need to recalculate the powertable, we 'll
+        * just use the cached one */
+       if (!fast) {
+               ret = ath5k_setup_channel_powertable(ah, channel,
+                                                       ee_mode, type);
+                       if (ret)
+                               return ret;
+       }
 
        /* Limit max power if we have a CTL available */
        ath5k_get_max_ctl_power(ah, channel);
@@ -3210,7 +3215,7 @@ int ath5k_hw_set_txpower_limit(struct ath5k_hw *ah, u8 txpower)
        ATH5K_DBG(ah->ah_sc, ATH5K_DEBUG_TXPOWER,
                "changing txpower to %d\n", txpower);
 
-       return ath5k_hw_txpower(ah, channel, ee_mode, txpower);
+       return ath5k_hw_txpower(ah, channel, ee_mode, txpower, true);
 }
 
 /*************\
@@ -3220,13 +3225,42 @@ int ath5k_hw_set_txpower_limit(struct ath5k_hw *ah, u8 txpower)
 int ath5k_hw_phy_init(struct ath5k_hw *ah, struct ieee80211_channel *channel,
                                                u8 mode, u8 ee_mode, u8 freq)
 {
+       struct ieee80211_channel *curr_channel;
        int ret, i;
        u32 phy_tst1;
-
+       bool fast_txp;
        ret = 0;
 
        /*
-        * 5211/5212 Specific
+        * If we don't change channel/mode skip
+        * tx powertable calculation and use the
+        * cached one.
+        */
+       curr_channel = ah->ah_current_channel;
+       if ((channel->hw_value == curr_channel->hw_value) &&
+       (channel->center_freq == curr_channel->center_freq))
+               fast_txp = true;
+       else
+               fast_txp = false;
+
+       /*
+        * Set TX power
+        *
+        * Note: We need to do that before we set
+        * RF buffer settings on 5211/5212+ so that we
+        * properly set curve indices.
+        */
+       ret = ath5k_hw_txpower(ah, channel, ee_mode,
+                               ah->ah_txpower.txp_max_pwr / 2,
+                               fast_txp);
+       if (ret)
+               return ret;
+
+       /*
+        * For 5210 we do all initialization using
+        * initvals, so we don't have to modify
+        * any settings (5210 also only supports
+        * a/aturbo modes)
         */
        if (ah->ah_version != AR5K_AR5210) {
 
@@ -3241,21 +3275,12 @@ int ath5k_hw_phy_init(struct ath5k_hw *ah, struct ieee80211_channel *channel,
                mdelay(1);
 
                /*
-                * Set TX power
-                */
-               ret = ath5k_hw_txpower(ah, channel, ee_mode,
-                                       ah->ah_txpower.txp_max_pwr / 2);
-               if (ret)
-                       return ret;
-
-               /*
                 * Write RF buffer
                 */
                ret = ath5k_hw_rfregs_init(ah, channel, mode);
                if (ret)
                        return ret;
 
-
                /* Write OFDM timings on 5212*/
                if (ah->ah_version == AR5K_AR5212 &&
                        channel->hw_value & CHANNEL_OFDM) {
@@ -3284,12 +3309,6 @@ int ath5k_hw_phy_init(struct ath5k_hw *ah, struct ieee80211_channel *channel,
                }
 
        } else {
-               /*
-                * For 5210 we do all initialization using
-                * initvals, so we don't have to modify
-                * any settings (5210 also only supports
-                * a/aturbo modes)
-                */
                mdelay(1);
                /* Disable phy and wait */
                ath5k_hw_reg_write(ah, AR5K_PHY_ACT_DISABLE, AR5K_PHY_ACT);