ath5k: Linear PCDAC code fixes

* Set correct xpd curve indices for high/low gain curves during
   rfbuffer setup on RF5112B with both calibration curves available.

 * Don't return zero min power when we have the same pcdac value
   twice because it breaks interpolation. Instead return the right
   x barrier as we do when we have equal power levels for 2 different
   pcdac values.

Signed-off-by: Nick Kossifidis <mickflemm@gmail.com>
Acked-by: Bob Copeland <me@bobcopeland.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 17 insertions, 7 deletions

diff --git a/drivers/net/wireless/ath/ath5k/phy.c b/drivers/net/wireless/ath/ath5k/phy.c
index 2075ba993966..6afba98f6adb 100644
--- a/drivers/net/wireless/ath/ath5k/phy.c
+++ b/drivers/net/wireless/ath/ath5k/phy.c
@@ -740,13 +740,22 @@ int ath5k_hw_rfregs_init(struct ath5k_hw *ah, struct ieee80211_channel *channel,
                                                 AR5K_RF_XPD_GAIN, true);
 
                 } else {
-                        /* TODO: Set high and low gain bits */
-                        ath5k_hw_rfb_op(ah, rf_regs,
-                                                ee->ee_x_gain[ee_mode],
+                        u8 *pdg_curve_to_idx = ee->ee_pdc_to_idx[ee_mode];
+                        if (ee->ee_pd_gains[ee_mode] > 1) {
+                                ath5k_hw_rfb_op(ah, rf_regs,
+                                                pdg_curve_to_idx[0],
                                                 AR5K_RF_PD_GAIN_LO, true);
-                        ath5k_hw_rfb_op(ah, rf_regs,
-                                                ee->ee_x_gain[ee_mode],
+                                ath5k_hw_rfb_op(ah, rf_regs,
+                                                pdg_curve_to_idx[1],
                                                 AR5K_RF_PD_GAIN_HI, true);
+                        } else {
+                                ath5k_hw_rfb_op(ah, rf_regs,
+                                                pdg_curve_to_idx[0],
+                                                AR5K_RF_PD_GAIN_LO, true);
+                                ath5k_hw_rfb_op(ah, rf_regs,
+                                                pdg_curve_to_idx[0],
+                                                AR5K_RF_PD_GAIN_HI, true);
+                        }
 
                         /* Lower synth voltage on Rev 2 */
                         ath5k_hw_rfb_op(ah, rf_regs, 2,
@@ -1896,8 +1905,9 @@ ath5k_get_linear_pcdac_min(const u8 *stepL, const u8 *stepR,
         s16 min_pwrL, min_pwrR;
         s16 pwr_i;
 
-        if (WARN_ON(stepL[0] == stepL[1] || stepR[0] == stepR[1]))
-                return 0;
+        /* Some vendors write the same pcdac value twice !!! */
+        if (stepL[0] == stepL[1] || stepR[0] == stepR[1])
+                return max(pwrL[0], pwrR[0]);
 
         if (pwrL[0] == pwrL[1])
                 min_pwrL = pwrL[0];