ath9k: check for Rx-STBC flag and pass it to ieee80211

This patch make use of STBC flag in DMA RX descriptor.
Only devices after ar9280 can provide this information.

If card support it we will set HAVE_STBC flag, to show
clint programm thet STBC is supported but not received.

Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

3 files changed, 15 insertions, 3 deletions

diff --git a/drivers/net/wireless/ath/ath9k/init.c b/drivers/net/wireless/ath/ath9k/init.c
index c7b888f22703..0536d442b068 100644
--- a/drivers/net/wireless/ath/ath9k/init.c
+++ b/drivers/net/wireless/ath/ath9k/init.c
@@ -21,6 +21,7 @@
 #include <linux/ath9k_platform.h>
 #include <linux/module.h>
 #include <linux/relay.h>
+#include <net/ieee80211_radiotap.h>
 
 #include "ath9k.h"
 
@@ -766,8 +767,13 @@ void ath9k_set_hw_capab(struct ath_softc *sc, struct ieee80211_hw *hw)
                 IEEE80211_HW_REPORTS_TX_ACK_STATUS |
                 IEEE80211_HW_SUPPORTS_RC_TABLE;
 
-        if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_HT)
-                 hw->flags |= IEEE80211_HW_AMPDU_AGGREGATION;
+        if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_HT) {
+                hw->flags |= IEEE80211_HW_AMPDU_AGGREGATION;
+
+                if (AR_SREV_9280_20_OR_LATER(ah))
+                        hw->radiotap_mcs_details |=
+                                IEEE80211_RADIOTAP_MCS_HAVE_STBC;
+        }
 
         if (AR_SREV_9160_10_OR_LATER(sc->sc_ah) || ath9k_modparam_nohwcrypt)
                 hw->flags |= IEEE80211_HW_MFP_CAPABLE;
diff --git a/drivers/net/wireless/ath/ath9k/mac.c b/drivers/net/wireless/ath/ath9k/mac.c
index a52081d73bef..d055e389abfc 100644
--- a/drivers/net/wireless/ath/ath9k/mac.c
+++ b/drivers/net/wireless/ath/ath9k/mac.c
@@ -593,6 +593,11 @@ int ath9k_hw_rxprocdesc(struct ath_hw *ah, struct ath_desc *ds,
                 (ads.ds_rxstatus3 & AR_GI) ? RX_FLAG_SHORT_GI : 0;
         rs->flag |=
                 (ads.ds_rxstatus3 & AR_2040) ? RX_FLAG_40MHZ : 0;
+        if (AR_SREV_9280_20_OR_LATER(ah))
+                rs->flag |=
+                        (ads.ds_rxstatus3 & AR_STBC) ?
+                                /* we can only Nss=1 STBC */
+                                (1 << RX_FLAG_STBC_SHIFT) : 0;
 
         if (ads.ds_rxstatus8 & AR_PreDelimCRCErr)
                 rs->rs_flags |= ATH9K_RX_DELIM_CRC_PRE;
diff --git a/drivers/net/wireless/ath/ath9k/mac.h b/drivers/net/wireless/ath/ath9k/mac.h
index 3f1e7754a1a7..b02dfce964b4 100644
--- a/drivers/net/wireless/ath/ath9k/mac.h
+++ b/drivers/net/wireless/ath/ath9k/mac.h
@@ -534,7 +534,8 @@ struct ar5416_desc {
 #define AR_2040             0x00000002
 #define AR_Parallel40       0x00000004
 #define AR_Parallel40_S     2
-#define AR_RxStatusRsvd30   0x000000f8
+#define AR_STBC             0x00000008 /* on ar9280 and later */
+#define AR_RxStatusRsvd30   0x000000f0
 #define AR_RxAntenna        0xffffff00
 #define AR_RxAntenna_S      8