b43: N-PHY: set band on every channel switch

Seems to be required by some hardware, wl does it every time.
Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/b43/phy_n.c

@@ -6058,23 +6058,23 @@ static void b43_nphy_channel_setup(struct b43_wldev *dev,
 	struct b43_phy *phy = &dev->phy;
 	struct b43_phy_n *nphy = dev->phy.n;
 	int ch = new_channel->hw_value;
-
-	u16 old_band_5ghz;
 	u16 tmp16;
 
-	old_band_5ghz =
-		b43_phy_read(dev, B43_NPHY_BANDCTL) & B43_NPHY_BANDCTL_5GHZ;
-	if (new_channel->band == IEEE80211_BAND_5GHZ && !old_band_5ghz) {
+	if (new_channel->band == IEEE80211_BAND_5GHZ) {
 		tmp16 = b43_read16(dev, B43_MMIO_PSM_PHY_HDR);
 		b43_write16(dev, B43_MMIO_PSM_PHY_HDR, tmp16 | 4);
-		b43_phy_set(dev, B43_PHY_B_BBCFG, 0xC000);
+		/* Put BPHY in the reset */
+		b43_phy_set(dev, B43_PHY_B_BBCFG,
+			    B43_PHY_B_BBCFG_RSTCCA | B43_PHY_B_BBCFG_RSTRX);
 		b43_write16(dev, B43_MMIO_PSM_PHY_HDR, tmp16);
 		b43_phy_set(dev, B43_NPHY_BANDCTL, B43_NPHY_BANDCTL_5GHZ);
-	} else if (new_channel->band == IEEE80211_BAND_2GHZ && old_band_5ghz) {
+	} else if (new_channel->band == IEEE80211_BAND_2GHZ) {
 		b43_phy_mask(dev, B43_NPHY_BANDCTL, ~B43_NPHY_BANDCTL_5GHZ);
 		tmp16 = b43_read16(dev, B43_MMIO_PSM_PHY_HDR);
 		b43_write16(dev, B43_MMIO_PSM_PHY_HDR, tmp16 | 4);
-		b43_phy_mask(dev, B43_PHY_B_BBCFG, 0x3FFF);
+		/* Take BPHY out of the reset */
+		b43_phy_mask(dev, B43_PHY_B_BBCFG,
+			     (u16)~(B43_PHY_B_BBCFG_RSTCCA | B43_PHY_B_BBCFG_RSTRX));
 		b43_write16(dev, B43_MMIO_PSM_PHY_HDR, tmp16);
 	}
 

drivers/net/wireless/b43/phy_n.h

@@ -869,6 +869,8 @@
 #define B43_NPHY_REV7_RF_CTL_OVER6		B43_PHY_N(0x347)
 
 #define B43_PHY_B_BBCFG				B43_PHY_N_BMODE(0x001) /* BB config */
+#define  B43_PHY_B_BBCFG_RSTCCA			0x4000 /* Reset CCA */
+#define  B43_PHY_B_BBCFG_RSTRX			0x8000 /* Reset RX */
 #define B43_PHY_B_TEST				B43_PHY_N_BMODE(0x00A)
 
 struct b43_wldev;