b43: N-PHY: optimize radio switching on/off

Broadcom's wl 6.30.223.141 has some optimizations for radios 0x205[67].
Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/b43/main.c

@@ -3742,7 +3742,9 @@ static int b43_switch_band(struct b43_wldev *dev,
 	b43dbg(dev->wl, "Switching to %s GHz band\n",
 	       band_to_string(chan->band));
 
-	b43_software_rfkill(dev, true);
+	/* Some new devices don't need disabling radio for band switching */
+	if (!(phy->type == B43_PHYTYPE_N && phy->rev >= 3))
+		b43_software_rfkill(dev, true);
 
 	phy->gmode = gmode;
 	b43_phy_put_into_reset(dev);

drivers/net/wireless/b43/phy_n.c

@@ -5707,10 +5707,12 @@ static void b43_nphy_op_software_rfkill(struct b43_wldev *dev,
 		}
 	} else {
 		if (dev->phy.rev >= 7) {
-			b43_radio_2057_init(dev);
+			if (!dev->phy.radio_on)
+				b43_radio_2057_init(dev);
 			b43_switch_channel(dev, dev->phy.channel);
 		} else if (dev->phy.rev >= 3) {
-			b43_radio_init2056(dev);
+			if (!dev->phy.radio_on)
+				b43_radio_init2056(dev);
 			b43_switch_channel(dev, dev->phy.channel);
 		} else {
 			b43_radio_init2055(dev);