wl1271: Change supported channel order for a more optimal scan

The mac80211 inserts channels into a scan request in the same order the driver
registers them. Use this fact to optimize scan by ordering the channels so
that adjacent channels don't get scanned consecutively.
Signed-off-by: Juuso Oikarinen <juuso.oikarinen@nokia.com>
Reviewed-by: Luciano Coelho <luciano.coelho@nokia.com>
Signed-off-by: Luciano Coelho <luciano.coelho@nokia.com>

drivers/net/wireless/wl12xx/wl1271_main.c

@@ -2057,21 +2057,24 @@ static struct ieee80211_rate wl1271_rates[] = {
 	  .hw_value_short = CONF_HW_BIT_RATE_54MBPS, },
 };
 
-/* can't be const, mac80211 writes to this */
+/*
+ * Can't be const, mac80211 writes to this. The order of the channels here
+ * is designed to improve scanning.
+ */
 static struct ieee80211_channel wl1271_channels[] = {
 	{ .hw_value = 1, .center_freq = 2412, .max_power = 25 },
-	{ .hw_value = 2, .center_freq = 2417, .max_power = 25 },
-	{ .hw_value = 3, .center_freq = 2422, .max_power = 25 },
-	{ .hw_value = 4, .center_freq = 2427, .max_power = 25 },
 	{ .hw_value = 5, .center_freq = 2432, .max_power = 25 },
-	{ .hw_value = 6, .center_freq = 2437, .max_power = 25 },
-	{ .hw_value = 7, .center_freq = 2442, .max_power = 25 },
-	{ .hw_value = 8, .center_freq = 2447, .max_power = 25 },
 	{ .hw_value = 9, .center_freq = 2452, .max_power = 25 },
-	{ .hw_value = 10, .center_freq = 2457, .max_power = 25 },
-	{ .hw_value = 11, .center_freq = 2462, .max_power = 25 },
-	{ .hw_value = 12, .center_freq = 2467, .max_power = 25 },
 	{ .hw_value = 13, .center_freq = 2472, .max_power = 25 },
+	{ .hw_value = 4, .center_freq = 2427, .max_power = 25 },
+	{ .hw_value = 8, .center_freq = 2447, .max_power = 25 },
+	{ .hw_value = 12, .center_freq = 2467, .max_power = 25 },
+	{ .hw_value = 3, .center_freq = 2422, .max_power = 25 },
+	{ .hw_value = 7, .center_freq = 2442, .max_power = 25 },
+	{ .hw_value = 11, .center_freq = 2462, .max_power = 25 },
+	{ .hw_value = 2, .center_freq = 2417, .max_power = 25 },
+	{ .hw_value = 6, .center_freq = 2437, .max_power = 25 },
+	{ .hw_value = 10, .center_freq = 2457, .max_power = 25 },
 };
 
 /* mapping to indexes for wl1271_rates */
@@ -2140,49 +2143,52 @@ static struct ieee80211_rate wl1271_rates_5ghz[] = {
 	  .hw_value_short = CONF_HW_BIT_RATE_54MBPS, },
 };
 
-/* 5 GHz band channels for WL1273 */
+/*
+ * 5 GHz band channels for WL1273 - can't be const, mac80211 writes to this.
+ * The order of the channels here is designed to improve scanning.
+ */
 static struct ieee80211_channel wl1271_channels_5ghz[] = {
 	{ .hw_value = 183, .center_freq = 4915},
-	{ .hw_value = 184, .center_freq = 4920},
-	{ .hw_value = 185, .center_freq = 4925},
-	{ .hw_value = 187, .center_freq = 4935},
 	{ .hw_value = 188, .center_freq = 4940},
-	{ .hw_value = 189, .center_freq = 4945},
-	{ .hw_value = 192, .center_freq = 4960},
-	{ .hw_value = 196, .center_freq = 4980},
-	{ .hw_value = 7, .center_freq = 5035},
 	{ .hw_value = 8, .center_freq = 5040},
-	{ .hw_value = 9, .center_freq = 5045},
-	{ .hw_value = 11, .center_freq = 5055},
-	{ .hw_value = 12, .center_freq = 5060},
-	{ .hw_value = 16, .center_freq = 5080},
 	{ .hw_value = 34, .center_freq = 5170},
-	{ .hw_value = 36, .center_freq = 5180},
-	{ .hw_value = 38, .center_freq = 5190},
-	{ .hw_value = 40, .center_freq = 5200},
-	{ .hw_value = 42, .center_freq = 5210},
 	{ .hw_value = 44, .center_freq = 5220},
-	{ .hw_value = 46, .center_freq = 5230},
-	{ .hw_value = 48, .center_freq = 5240},
-	{ .hw_value = 52, .center_freq = 5260},
-	{ .hw_value = 56, .center_freq = 5280},
 	{ .hw_value = 60, .center_freq = 5300},
-	{ .hw_value = 64, .center_freq = 5320},
-	{ .hw_value = 100, .center_freq = 5500},
-	{ .hw_value = 104, .center_freq = 5520},
-	{ .hw_value = 108, .center_freq = 5540},
 	{ .hw_value = 112, .center_freq = 5560},
-	{ .hw_value = 116, .center_freq = 5580},
-	{ .hw_value = 120, .center_freq = 5600},
-	{ .hw_value = 124, .center_freq = 5620},
-	{ .hw_value = 128, .center_freq = 5640},
 	{ .hw_value = 132, .center_freq = 5660},
+	{ .hw_value = 157, .center_freq = 5785},
+	{ .hw_value = 184, .center_freq = 4920},
+	{ .hw_value = 189, .center_freq = 4945},
+	{ .hw_value = 9, .center_freq = 5045},
+	{ .hw_value = 36, .center_freq = 5180},
+	{ .hw_value = 46, .center_freq = 5230},
+	{ .hw_value = 64, .center_freq = 5320},
+	{ .hw_value = 116, .center_freq = 5580},
 	{ .hw_value = 136, .center_freq = 5680},
+	{ .hw_value = 192, .center_freq = 4960},
+	{ .hw_value = 11, .center_freq = 5055},
+	{ .hw_value = 38, .center_freq = 5190},
+	{ .hw_value = 48, .center_freq = 5240},
+	{ .hw_value = 100, .center_freq = 5500},
+	{ .hw_value = 120, .center_freq = 5600},
 	{ .hw_value = 140, .center_freq = 5700},
+	{ .hw_value = 185, .center_freq = 4925},
+	{ .hw_value = 196, .center_freq = 4980},
+	{ .hw_value = 12, .center_freq = 5060},
+	{ .hw_value = 40, .center_freq = 5200},
+	{ .hw_value = 52, .center_freq = 5260},
+	{ .hw_value = 104, .center_freq = 5520},
+	{ .hw_value = 124, .center_freq = 5620},
 	{ .hw_value = 149, .center_freq = 5745},
-	{ .hw_value = 153, .center_freq = 5765},
-	{ .hw_value = 157, .center_freq = 5785},
 	{ .hw_value = 161, .center_freq = 5805},
+	{ .hw_value = 187, .center_freq = 4935},
+	{ .hw_value = 7, .center_freq = 5035},
+	{ .hw_value = 16, .center_freq = 5080},
+	{ .hw_value = 42, .center_freq = 5210},
+	{ .hw_value = 56, .center_freq = 5280},
+	{ .hw_value = 108, .center_freq = 5540},
+	{ .hw_value = 128, .center_freq = 5640},
+	{ .hw_value = 153, .center_freq = 5765},
 	{ .hw_value = 165, .center_freq = 5825},
 };