ath5k: add a missing srev checks for code that lowers the synth voltage - might fix some stability issues

SVN-Revision: 27325

package/mac80211/patches/441-ath5k_synth_voltage_srev_check.patch

@@ -0,0 +1,31 @@
+--- a/drivers/net/wireless/ath/ath5k/phy.c
++++ b/drivers/net/wireless/ath/ath5k/phy.c
+@@ -970,17 +970,20 @@ static int ath5k_hw_rfregs_init(struct a
+ 			}
+ 
+ 			/* Lower synth voltage on Rev 2 */
+-			ath5k_hw_rfb_op(ah, rf_regs, 2,
+-					AR5K_RF_HIGH_VC_CP, true);
++			if (ah->ah_radio == AR5K_RF5112 &&
++			    (ah->ah_radio_5ghz_revision & AR5K_SREV_REV) > 0) {
++				ath5k_hw_rfb_op(ah, rf_regs, 2,
++						AR5K_RF_HIGH_VC_CP, true);
+ 
+-			ath5k_hw_rfb_op(ah, rf_regs, 2,
+-					AR5K_RF_MID_VC_CP, true);
++				ath5k_hw_rfb_op(ah, rf_regs, 2,
++						AR5K_RF_MID_VC_CP, true);
+ 
+-			ath5k_hw_rfb_op(ah, rf_regs, 2,
+-					AR5K_RF_LOW_VC_CP, true);
++				ath5k_hw_rfb_op(ah, rf_regs, 2,
++						AR5K_RF_LOW_VC_CP, true);
+ 
+-			ath5k_hw_rfb_op(ah, rf_regs, 2,
+-					AR5K_RF_PUSH_UP, true);
++				ath5k_hw_rfb_op(ah, rf_regs, 2,
++						AR5K_RF_PUSH_UP, true);
++			}
+ 
+ 			/* Decrease power consumption on 5213+ BaseBand */
+ 			if (ah->ah_phy_revision >= AR5K_SREV_PHY_5212A) {