ath5k: Tweak phy activate to rx start delay based on bwmode

 * Tweak phy activation -> rx delay for different bwmodes
Signed-off-by: Nick Kossifidis <mickflemm@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/ath5k/phy.c

@@ -3356,8 +3356,6 @@ int ath5k_hw_phy_init(struct ath5k_hw *ah, struct ieee80211_channel *channel,
 	/*
 	 * On 5211+ read activation -> rx delay
 	 * and use it.
-	 *
-	 * TODO: Half/quarter rate support
 	 */
 	if (ah->ah_version != AR5K_AR5210) {
 		u32 delay;
@@ -3365,8 +3363,13 @@ int ath5k_hw_phy_init(struct ath5k_hw *ah, struct ieee80211_channel *channel,
 			AR5K_PHY_RX_DELAY_M;
 		delay = (channel->hw_value & CHANNEL_CCK) ?
 			((delay << 2) / 22) : (delay / 10);
-
-		udelay(100 + (2 * delay));
+		if (ah->ah_bwmode == AR5K_BWMODE_10MHZ)
+			delay = delay << 1;
+		if (ah->ah_bwmode == AR5K_BWMODE_5MHZ)
+			delay = delay << 2;
+		/* XXX: /2 on turbo ? Let's be safe
+		 * for now */
+		udelay(100 + delay);
 	} else {
 		mdelay(1);
 	}