5 files changed, 92 insertions, 95 deletions

diff --git a/drivers/net/wireless/rt2x00/rt2400pci.c b/drivers/net/wireless/rt2x00/rt2400pci.c
index 1afba42cc12..e87ad43e8e8 100644
--- a/drivers/net/wireless/rt2x00/rt2400pci.c
+++ b/drivers/net/wireless/rt2x00/rt2400pci.c
@@ -600,35 +600,36 @@ static void rt2400pci_link_stats(struct rt2x00_dev *rt2x00dev,
         qual->false_cca = bbp;
 }
 
+static inline void rt2400pci_set_vgc(struct rt2x00_dev *rt2x00dev, u8 vgc_level)
+{
+        rt2400pci_bbp_write(rt2x00dev, 13, vgc_level);
+        rt2x00dev->link.vgc_level = vgc_level;
+        rt2x00dev->link.vgc_level_reg = vgc_level;
+}
+
 static void rt2400pci_reset_tuner(struct rt2x00_dev *rt2x00dev)
 {
-        rt2400pci_bbp_write(rt2x00dev, 13, 0x08);
-        rt2x00dev->link.vgc_level = 0x08;
+        rt2400pci_set_vgc(rt2x00dev, 0x08);
 }
 
 static void rt2400pci_link_tuner(struct rt2x00_dev *rt2x00dev)
 {
-        u8 reg;
+        struct link *link = &rt2x00dev->link;
 
         /*
          * The link tuner should not run longer then 60 seconds,
          * and should run once every 2 seconds.
          */
-        if (rt2x00dev->link.count > 60 || !(rt2x00dev->link.count & 1))
+        if (link->count > 60 || !(link->count & 1))
                 return;
 
         /*
          * Base r13 link tuning on the false cca count.
          */
-        rt2400pci_bbp_read(rt2x00dev, 13, &reg);
-
-        if (rt2x00dev->link.qual.false_cca > 512 && reg < 0x20) {
-                rt2400pci_bbp_write(rt2x00dev, 13, ++reg);
-                rt2x00dev->link.vgc_level = reg;
-        } else if (rt2x00dev->link.qual.false_cca < 100 && reg > 0x08) {
-                rt2400pci_bbp_write(rt2x00dev, 13, --reg);
-                rt2x00dev->link.vgc_level = reg;
-        }
+        if ((link->qual.false_cca > 512) && (link->vgc_level < 0x20))
+                rt2400pci_set_vgc(rt2x00dev, ++link->vgc_level);
+        else if ((link->qual.false_cca < 100) && (link->vgc_level > 0x08))
+                rt2400pci_set_vgc(rt2x00dev, --link->vgc_level);
 }
 
 /*
diff --git a/drivers/net/wireless/rt2x00/rt2500pci.c b/drivers/net/wireless/rt2x00/rt2500pci.c
index bf5e81162f2..5b98a74a255 100644
--- a/drivers/net/wireless/rt2x00/rt2500pci.c
+++ b/drivers/net/wireless/rt2x00/rt2500pci.c
@@ -639,16 +639,23 @@ static void rt2500pci_link_stats(struct rt2x00_dev *rt2x00dev,
         qual->false_cca = rt2x00_get_field32(reg, CNT3_FALSE_CCA);
 }
 
+static inline void rt2500pci_set_vgc(struct rt2x00_dev *rt2x00dev, u8 vgc_level)
+{
+        if (rt2x00dev->link.vgc_level_reg != vgc_level) {
+                rt2500pci_bbp_write(rt2x00dev, 17, vgc_level);
+                rt2x00dev->link.vgc_level_reg = vgc_level;
+        }
+}
+
 static void rt2500pci_reset_tuner(struct rt2x00_dev *rt2x00dev)
 {
-        rt2500pci_bbp_write(rt2x00dev, 17, 0x48);
-        rt2x00dev->link.vgc_level = 0x48;
+        rt2500pci_set_vgc(rt2x00dev, 0x48);
 }
 
 static void rt2500pci_link_tuner(struct rt2x00_dev *rt2x00dev)
 {
-        int rssi = rt2x00_get_link_rssi(&rt2x00dev->link);
-        u8 r17;
+        struct link *link = &rt2x00dev->link;
+        int rssi = rt2x00_get_link_rssi(link);
 
         /*
          * To prevent collisions with MAC ASIC on chipsets
@@ -656,12 +663,9 @@ static void rt2500pci_link_tuner(struct rt2x00_dev *rt2x00dev)
          * seconds while being associated.
          */
         if (rt2x00_rev(&rt2x00dev->chip) < RT2560_VERSION_D &&
-            rt2x00dev->intf_associated &&
-            rt2x00dev->link.count > 20)
+            rt2x00dev->intf_associated && link->count > 20)
                 return;
 
-        rt2500pci_bbp_read(rt2x00dev, 17, &r17);
-
         /*
          * Chipset versions C and lower should directly continue
          * to the dynamic CCA tuning. Chipset version D and higher
@@ -677,11 +681,9 @@ static void rt2500pci_link_tuner(struct rt2x00_dev *rt2x00dev)
          * then corrupt the R17 tuning. To remidy this the tuning should
          * be stopped (While making sure the R17 value will not exceed limits)
          */
-        if (rssi < -80 && rt2x00dev->link.count > 20) {
-                if (r17 >= 0x41) {
-                        r17 = rt2x00dev->link.vgc_level;
-                        rt2500pci_bbp_write(rt2x00dev, 17, r17);
-                }
+        if (rssi < -80 && link->count > 20) {
+                if (link->vgc_level_reg >= 0x41)
+                        rt2500pci_set_vgc(rt2x00dev, link->vgc_level);
                 return;
         }
 
@@ -689,8 +691,7 @@ static void rt2500pci_link_tuner(struct rt2x00_dev *rt2x00dev)
          * Special big-R17 for short distance
          */
         if (rssi >= -58) {
-                if (r17 != 0x50)
-                        rt2500pci_bbp_write(rt2x00dev, 17, 0x50);
+                rt2500pci_set_vgc(rt2x00dev, 0x50);
                 return;
         }
 
@@ -698,8 +699,7 @@ static void rt2500pci_link_tuner(struct rt2x00_dev *rt2x00dev)
          * Special mid-R17 for middle distance
          */
         if (rssi >= -74) {
-                if (r17 != 0x41)
-                        rt2500pci_bbp_write(rt2x00dev, 17, 0x41);
+                rt2500pci_set_vgc(rt2x00dev, 0x41);
                 return;
         }
 
@@ -707,8 +707,8 @@ static void rt2500pci_link_tuner(struct rt2x00_dev *rt2x00dev)
          * Leave short or middle distance condition, restore r17
          * to the dynamic tuning range.
          */
-        if (r17 >= 0x41) {
-                rt2500pci_bbp_write(rt2x00dev, 17, rt2x00dev->link.vgc_level);
+        if (link->vgc_level_reg >= 0x41) {
+                rt2500pci_set_vgc(rt2x00dev, link->vgc_level);
                 return;
         }
 
@@ -718,12 +718,12 @@ dynamic_cca_tune:
          * R17 is inside the dynamic tuning range,
          * start tuning the link based on the false cca counter.
          */
-        if (rt2x00dev->link.qual.false_cca > 512 && r17 < 0x40) {
-                rt2500pci_bbp_write(rt2x00dev, 17, ++r17);
-                rt2x00dev->link.vgc_level = r17;
-        } else if (rt2x00dev->link.qual.false_cca < 100 && r17 > 0x32) {
-                rt2500pci_bbp_write(rt2x00dev, 17, --r17);
-                rt2x00dev->link.vgc_level = r17;
+        if (link->qual.false_cca > 512 && link->vgc_level_reg < 0x40) {
+                rt2500pci_set_vgc(rt2x00dev, ++link->vgc_level_reg);
+                link->vgc_level = link->vgc_level_reg;
+        } else if (link->qual.false_cca < 100 && link->vgc_level_reg > 0x32) {
+                rt2500pci_set_vgc(rt2x00dev, --link->vgc_level_reg);
+                link->vgc_level = link->vgc_level_reg;
         }
 }
 
diff --git a/drivers/net/wireless/rt2x00/rt2x00.h b/drivers/net/wireless/rt2x00/rt2x00.h
index 19c068727a8..8935f2c005c 100644
--- a/drivers/net/wireless/rt2x00/rt2x00.h
+++ b/drivers/net/wireless/rt2x00/rt2x00.h
@@ -286,9 +286,14 @@ struct link {
         struct link_ant ant;
 
         /*
-         * Active VGC level
+         * Active VGC level (for false cca tuning)
          */
-        int vgc_level;
+        u8 vgc_level;
+
+        /*
+         * VGC level as configured in register
+         */
+        u8 vgc_level_reg;
 
         /*
          * Work structure for scheduling periodic link tuning.
diff --git a/drivers/net/wireless/rt2x00/rt61pci.c b/drivers/net/wireless/rt2x00/rt61pci.c
index c7ab744f005..94523f7f0d8 100644
--- a/drivers/net/wireless/rt2x00/rt61pci.c
+++ b/drivers/net/wireless/rt2x00/rt61pci.c
@@ -1046,21 +1046,27 @@ static void rt61pci_link_stats(struct rt2x00_dev *rt2x00dev,
         qual->false_cca = rt2x00_get_field32(reg, STA_CSR1_FALSE_CCA_ERROR);
 }
 
+static inline void rt61pci_set_vgc(struct rt2x00_dev *rt2x00dev, u8 vgc_level)
+{
+        if (rt2x00dev->link.vgc_level != vgc_level) {
+                rt61pci_bbp_write(rt2x00dev, 17, vgc_level);
+                rt2x00dev->link.vgc_level = vgc_level;
+                rt2x00dev->link.vgc_level_reg = vgc_level;
+        }
+}
+
 static void rt61pci_reset_tuner(struct rt2x00_dev *rt2x00dev)
 {
-        rt61pci_bbp_write(rt2x00dev, 17, 0x20);
-        rt2x00dev->link.vgc_level = 0x20;
+        rt61pci_set_vgc(rt2x00dev, 0x20);
 }
 
 static void rt61pci_link_tuner(struct rt2x00_dev *rt2x00dev)
 {
-        int rssi = rt2x00_get_link_rssi(&rt2x00dev->link);
-        u8 r17;
+        struct link *link = &rt2x00dev->link;
+        int rssi = rt2x00_get_link_rssi(link);
         u8 up_bound;
         u8 low_bound;
 
-        rt61pci_bbp_read(rt2x00dev, 17, &r17);
-
         /*
          * Determine r17 bounds.
          */
@@ -1091,8 +1097,7 @@ static void rt61pci_link_tuner(struct rt2x00_dev *rt2x00dev)
          * Special big-R17 for very short distance
          */
         if (rssi >= -35) {
-                if (r17 != 0x60)
-                        rt61pci_bbp_write(rt2x00dev, 17, 0x60);
+                rt61pci_set_vgc(rt2x00dev, 0x60);
                 return;
         }
 
@@ -1100,8 +1105,7 @@ static void rt61pci_link_tuner(struct rt2x00_dev *rt2x00dev)
          * Special big-R17 for short distance
          */
         if (rssi >= -58) {
-                if (r17 != up_bound)
-                        rt61pci_bbp_write(rt2x00dev, 17, up_bound);
+                rt61pci_set_vgc(rt2x00dev, up_bound);
                 return;
         }
 
@@ -1109,9 +1113,7 @@ static void rt61pci_link_tuner(struct rt2x00_dev *rt2x00dev)
          * Special big-R17 for middle-short distance
          */
         if (rssi >= -66) {
-                low_bound += 0x10;
-                if (r17 != low_bound)
-                        rt61pci_bbp_write(rt2x00dev, 17, low_bound);
+                rt61pci_set_vgc(rt2x00dev, low_bound + 0x10);
                 return;
         }
 
@@ -1119,9 +1121,7 @@ static void rt61pci_link_tuner(struct rt2x00_dev *rt2x00dev)
          * Special mid-R17 for middle distance
          */
         if (rssi >= -74) {
-                low_bound += 0x08;
-                if (r17 != low_bound)
-                        rt61pci_bbp_write(rt2x00dev, 17, low_bound);
+                rt61pci_set_vgc(rt2x00dev, low_bound + 0x08);
                 return;
         }
 
@@ -1133,8 +1133,8 @@ static void rt61pci_link_tuner(struct rt2x00_dev *rt2x00dev)
         if (low_bound > up_bound)
                 up_bound = low_bound;
 
-        if (r17 > up_bound) {
-                rt61pci_bbp_write(rt2x00dev, 17, up_bound);
+        if (link->vgc_level > up_bound) {
+                rt61pci_set_vgc(rt2x00dev, up_bound);
                 return;
         }
 
@@ -1144,15 +1144,10 @@ dynamic_cca_tune:
          * r17 does not yet exceed upper limit, continue and base
          * the r17 tuning on the false CCA count.
          */
-        if (rt2x00dev->link.qual.false_cca > 512 && r17 < up_bound) {
-                if (++r17 > up_bound)
-                        r17 = up_bound;
-                rt61pci_bbp_write(rt2x00dev, 17, r17);
-        } else if (rt2x00dev->link.qual.false_cca < 100 && r17 > low_bound) {
-                if (--r17 < low_bound)
-                        r17 = low_bound;
-                rt61pci_bbp_write(rt2x00dev, 17, r17);
-        }
+        if ((link->qual.false_cca > 512) && (link->vgc_level < up_bound))
+                rt61pci_set_vgc(rt2x00dev, ++link->vgc_level);
+        else if ((link->qual.false_cca < 100) && (link->vgc_level > low_bound))
+                rt61pci_set_vgc(rt2x00dev, --link->vgc_level);
 }
 
 /*
diff --git a/drivers/net/wireless/rt2x00/rt73usb.c b/drivers/net/wireless/rt2x00/rt73usb.c
index ae3b31d0d51..b5443148d62 100644
--- a/drivers/net/wireless/rt2x00/rt73usb.c
+++ b/drivers/net/wireless/rt2x00/rt73usb.c
@@ -924,21 +924,27 @@ static void rt73usb_link_stats(struct rt2x00_dev *rt2x00dev,
         qual->false_cca = rt2x00_get_field32(reg, STA_CSR1_FALSE_CCA_ERROR);
 }
 
+static inline void rt73usb_set_vgc(struct rt2x00_dev *rt2x00dev, u8 vgc_level)
+{
+        if (rt2x00dev->link.vgc_level != vgc_level) {
+                rt73usb_bbp_write(rt2x00dev, 17, vgc_level);
+                rt2x00dev->link.vgc_level = vgc_level;
+                rt2x00dev->link.vgc_level_reg = vgc_level;
+        }
+}
+
 static void rt73usb_reset_tuner(struct rt2x00_dev *rt2x00dev)
 {
-        rt73usb_bbp_write(rt2x00dev, 17, 0x20);
-        rt2x00dev->link.vgc_level = 0x20;
+        rt73usb_set_vgc(rt2x00dev, 0x20);
 }
 
 static void rt73usb_link_tuner(struct rt2x00_dev *rt2x00dev)
 {
-        int rssi = rt2x00_get_link_rssi(&rt2x00dev->link);
-        u8 r17;
+        struct link *link = &rt2x00dev->link;
+        int rssi = rt2x00_get_link_rssi(link);
         u8 up_bound;
         u8 low_bound;
 
-        rt73usb_bbp_read(rt2x00dev, 17, &r17);
-
         /*
          * Determine r17 bounds.
          */
@@ -979,8 +985,7 @@ static void rt73usb_link_tuner(struct rt2x00_dev *rt2x00dev)
          * Special big-R17 for very short distance
          */
         if (rssi > -35) {
-                if (r17 != 0x60)
-                        rt73usb_bbp_write(rt2x00dev, 17, 0x60);
+                rt73usb_set_vgc(rt2x00dev, 0x60);
                 return;
         }
 
@@ -988,8 +993,7 @@ static void rt73usb_link_tuner(struct rt2x00_dev *rt2x00dev)
          * Special big-R17 for short distance
          */
         if (rssi >= -58) {
-                if (r17 != up_bound)
-                        rt73usb_bbp_write(rt2x00dev, 17, up_bound);
+                rt73usb_set_vgc(rt2x00dev, up_bound);
                 return;
         }
 
@@ -997,9 +1001,7 @@ static void rt73usb_link_tuner(struct rt2x00_dev *rt2x00dev)
          * Special big-R17 for middle-short distance
          */
         if (rssi >= -66) {
-                low_bound += 0x10;
-                if (r17 != low_bound)
-                        rt73usb_bbp_write(rt2x00dev, 17, low_bound);
+                rt73usb_set_vgc(rt2x00dev, low_bound + 0x10);
                 return;
         }
 
@@ -1007,8 +1009,7 @@ static void rt73usb_link_tuner(struct rt2x00_dev *rt2x00dev)
          * Special mid-R17 for middle distance
          */
         if (rssi >= -74) {
-                if (r17 != (low_bound + 0x10))
-                        rt73usb_bbp_write(rt2x00dev, 17, low_bound + 0x08);
+                rt73usb_set_vgc(rt2x00dev, low_bound + 0x08);
                 return;
         }
 
@@ -1020,8 +1021,8 @@ static void rt73usb_link_tuner(struct rt2x00_dev *rt2x00dev)
         if (low_bound > up_bound)
                 up_bound = low_bound;
 
-        if (r17 > up_bound) {
-                rt73usb_bbp_write(rt2x00dev, 17, up_bound);
+        if (link->vgc_level > up_bound) {
+                rt73usb_set_vgc(rt2x00dev, up_bound);
                 return;
         }
 
@@ -1031,17 +1032,12 @@ dynamic_cca_tune:
          * r17 does not yet exceed upper limit, continue and base
          * the r17 tuning on the false CCA count.
          */
-        if (rt2x00dev->link.qual.false_cca > 512 && r17 < up_bound) {
-                r17 += 4;
-                if (r17 > up_bound)
-                        r17 = up_bound;
-                rt73usb_bbp_write(rt2x00dev, 17, r17);
-        } else if (rt2x00dev->link.qual.false_cca < 100 && r17 > low_bound) {
-                r17 -= 4;
-                if (r17 < low_bound)
-                        r17 = low_bound;
-                rt73usb_bbp_write(rt2x00dev, 17, r17);
-        }
+        if ((link->qual.false_cca > 512) && (link->vgc_level < up_bound))
+                rt73usb_set_vgc(rt2x00dev,
+                                min_t(u8, link->vgc_level + 4, up_bound));
+        else if ((link->qual.false_cca < 100) && (link->vgc_level > low_bound))
+                rt73usb_set_vgc(rt2x00dev,
+                                max_t(u8, link->vgc_level - 4, low_bound));
 }
 
 /*