ath9k: ar9003_mac: read STBC indicator from rx descriptor

The rx descriptor contains a STBC indicator. If the indicator is set the
frame was received with STBC.
Signed-off-by: Philipp Borgers <borgers@mi.fu-berlin.de>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20210517172426.15919-1-borgers@mi.fu-berlin.de

drivers/net/wireless/ath/ath9k/ar9003_mac.c

@@ -522,6 +522,8 @@ int ath9k_hw_process_rxdesc_edma(struct ath_hw *ah, struct ath_rx_status *rxs,
 	rxs->rs_moreaggr = (rxsp->status11 & AR_RxMoreAggr) ? 1 : 0;
 	rxs->rs_antenna = (MS(rxsp->status4, AR_RxAntenna) & 0x7);
 	rxs->enc_flags |= (rxsp->status4 & AR_GI) ? RX_ENC_FLAG_SHORT_GI : 0;
+	rxs->enc_flags |=
+		(rxsp->status4 & AR_STBC) ? (1 << RX_ENC_FLAG_STBC_SHIFT) : 0;
 	rxs->bw = (rxsp->status4 & AR_2040) ? RATE_INFO_BW_40 : RATE_INFO_BW_20;
 
 	rxs->evm0 = rxsp->status6;