ath9k: add support for Tx and Rx STBC

Supported only for single stream rates by the hardware

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

3 files changed, 15 insertions, 1 deletions

diff --git a/drivers/net/wireless/ath/ath9k/init.c b/drivers/net/wireless/ath/ath9k/init.c
index 351538cd8e4c..70e5aa415c89 100644
--- a/drivers/net/wireless/ath/ath9k/init.c
+++ b/drivers/net/wireless/ath/ath9k/init.c
@@ -214,6 +214,12 @@ static void setup_ht_cap(struct ath_softc *sc,
         else
                 max_streams = 2;
 
+        if (AR_SREV_9280_10_OR_LATER(ah)) {
+                if (max_streams >= 2)
+                        ht_info->cap |= IEEE80211_HT_CAP_TX_STBC;
+                ht_info->cap |= (1 << IEEE80211_HT_CAP_RX_STBC_SHIFT);
+        }
+
         /* set up supported mcs set */
         memset(&ht_info->mcs, 0, sizeof(ht_info->mcs));
         tx_streams = count_streams(common->tx_chainmask, max_streams);
diff --git a/drivers/net/wireless/ath/ath9k/mac.h b/drivers/net/wireless/ath/ath9k/mac.h
index 66d0d5e56149..00f3e0c7528a 100644
--- a/drivers/net/wireless/ath/ath9k/mac.h
+++ b/drivers/net/wireless/ath/ath9k/mac.h
@@ -37,6 +37,8 @@
           AR_2040_##_index : 0)                                         \
          |((_series)[_index].RateFlags & ATH9K_RATESERIES_HALFGI ?      \
            AR_GI##_index : 0)                                           \
+         |((_series)[_index].RateFlags & ATH9K_RATESERIES_STBC ?        \
+           AR_STBC##_index : 0)                                         \
          |SM((_series)[_index].ChSel, AR_ChainSel##_index))
 
 #define CCK_SIFS_TIME        10
@@ -434,7 +436,10 @@ struct ar5416_desc {
 #define AR_ChainSel3_S      17
 #define AR_RTSCTSRate       0x0ff00000
 #define AR_RTSCTSRate_S     20
-#define AR_TxCtlRsvd70      0xf0000000
+#define AR_STBC0            0x10000000
+#define AR_STBC1            0x20000000
+#define AR_STBC2            0x40000000
+#define AR_STBC3            0x80000000
 
 #define AR_TxRSSIAnt00      0x000000ff
 #define AR_TxRSSIAnt00_S    0
@@ -647,6 +652,7 @@ enum ath9k_rx_filter {
 #define ATH9K_RATESERIES_RTS_CTS  0x0001
 #define ATH9K_RATESERIES_2040     0x0002
 #define ATH9K_RATESERIES_HALFGI   0x0004
+#define ATH9K_RATESERIES_STBC     0x0008
 
 struct ath9k_11n_rate_series {
         u32 Tries;
diff --git a/drivers/net/wireless/ath/ath9k/xmit.c b/drivers/net/wireless/ath/ath9k/xmit.c
index 2237658144e6..b0d345a675fe 100644
--- a/drivers/net/wireless/ath/ath9k/xmit.c
+++ b/drivers/net/wireless/ath/ath9k/xmit.c
@@ -1607,6 +1607,8 @@ static void ath_buf_set_rate(struct ath_softc *sc, struct ath_buf *bf)
                         series[i].Rate = rix | 0x80;
                         series[i].PktDuration = ath_pkt_duration(sc, rix, bf,
                                  is_40, is_sgi, is_sp);
+                        if (rix < 8 && (tx_info->flags & IEEE80211_TX_CTL_STBC))
+                                series[i].RateFlags |= ATH9K_RATESERIES_STBC;
                         continue;
                 }