b43: N-PHY: implement chain selection

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 29 insertions, 1 deletions

diff --git a/drivers/net/wireless/b43/phy_n.c b/drivers/net/wireless/b43/phy_n.c
index 229f2d0364f2..90a49cfaa965 100644
--- a/drivers/net/wireless/b43/phy_n.c
+++ b/drivers/net/wireless/b43/phy_n.c
@@ -438,6 +438,34 @@ static void b43_nphy_update_mimo_config(struct b43_wldev *dev, s32 preamble)
         b43_phy_write(dev, B43_NPHY_MIMOCFG, mimocfg);
 }
 
+/* http://bcm-v4.sipsolutions.net/802.11/PHY/N/Chains */
+static void b43_nphy_update_txrx_chain(struct b43_wldev *dev)
+{
+        struct b43_phy_n *nphy = dev->phy.n;
+
+        bool override = false;
+        u16 chain = 0x33;
+
+        if (nphy->txrx_chain == 0) {
+                chain = 0x11;
+                override = true;
+        } else if (nphy->txrx_chain == 1) {
+                chain = 0x22;
+                override = true;
+        }
+
+        b43_phy_maskset(dev, B43_NPHY_RFSEQCA,
+                        ~(B43_NPHY_RFSEQCA_TXEN | B43_NPHY_RFSEQCA_RXEN),
+                        chain);
+
+        if (override)
+                b43_phy_set(dev, B43_NPHY_RFSEQMODE,
+                                B43_NPHY_RFSEQMODE_CAOVER);
+        else
+                b43_phy_mask(dev, B43_NPHY_RFSEQMODE,
+                                ~B43_NPHY_RFSEQMODE_CAOVER);
+}
+
 /* http://bcm-v4.sipsolutions.net/802.11/PHY/N/RxIqEst */
 static void b43_nphy_rx_iq_est(struct b43_wldev *dev, struct nphy_iq_est *est,
                                 u16 samps, u8 time, bool wait)
@@ -2223,7 +2251,7 @@ int b43_phy_initn(struct b43_wldev *dev)
         b43_phy_write(dev, B43_NPHY_TXRIFS_FRDEL, 0x30);
 
         b43_nphy_update_mimo_config(dev, nphy->preamble_override);
-        /* TODO Update TX/RX chain */
+        b43_nphy_update_txrx_chain(dev);
 
         if (phy->rev < 2) {
                 b43_phy_write(dev, B43_NPHY_DUP40_GFBL, 0xAA8);