[brcmfmac] Dynamically configure VHT settings to match firmware

1. Correct VHT MCS settings to support as many tx/rx streams as chip
   does.

2. Correct VHT capabilities to support what all chips do.

3. Correct max AMPDU capabilities for VHT.

4. Support LDPC and STBC in VHT where available.

Signed-off-by: Daniel Berlin <dberlin@dberlin.org>

Author: dberlin

drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c

@@ -7248,20 +7248,22 @@ static void brcmf_update_ht_cap(struct ieee80211_supported_band *band,
 	band->ht_cap.mcs.tx_params = IEEE80211_HT_MCS_TX_DEFINED;
 }
 
-static __le16 brcmf_get_mcs_map(u32 nchain, enum ieee80211_vht_mcs_support supp)
+static __le16 brcmf_get_mcs_map(u32 nstreams,
+				enum ieee80211_vht_mcs_support supp)
 {
 	u16 mcs_map;
 	int i;
 
-	for (i = 0, mcs_map = 0xFFFF; i < nchain; i++)
+	for (i = 0, mcs_map = 0xFFFF; i < nstreams; i++)
 		mcs_map = (mcs_map << 2) | supp;
 
 	return cpu_to_le16(mcs_map);
 }
 
 static void brcmf_update_vht_cap(struct ieee80211_supported_band *band,
-				 u32 bw_cap[2], u32 nchain, u32 txstreams,
-				 u32 txbf_bfe_cap, u32 txbf_bfr_cap)
+				 u32 bw_cap[2], u32 txstreams, u32 rxstreams,
+				 u32 txbf_bfe_cap, u32 txbf_bfr_cap,
+				 u32 ldpc_cap, u32 stbc_rx, u32 stbc_tx)
 {
 	__le16 mcs_map;
 
@@ -7270,15 +7272,32 @@ static void brcmf_update_vht_cap(struct ieee80211_supported_band *band,
 		return;
 
 	band->vht_cap.vht_supported = true;
+	band->vht_cap.vht_mcs.tx_highest = cpu_to_le16(433 * txstreams);
+	band->vht_cap.vht_mcs.rx_highest = cpu_to_le16(433 * rxstreams);
+
+	band->vht_cap.cap |= IEEE80211_VHT_CAP_RX_ANTENNA_PATTERN |
+			     IEEE80211_VHT_CAP_TX_ANTENNA_PATTERN;
+
+	if (ldpc_cap)
+		band->vht_cap.cap |= IEEE80211_VHT_CAP_RXLDPC;
+	if (stbc_tx)
+		band->vht_cap.cap |= IEEE80211_VHT_CAP_TXSTBC;
+
+	if (stbc_rx)
+		band->vht_cap.cap |=
+			(stbc_rx << IEEE80211_VHT_CAP_RXSTBC_SHIFT);
+
 	/* 80MHz is mandatory */
 	band->vht_cap.cap |= IEEE80211_VHT_CAP_SHORT_GI_80;
 	if (bw_cap[band->band] & WLC_BW_160MHZ_BIT) {
 		band->vht_cap.cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
 		band->vht_cap.cap |= IEEE80211_VHT_CAP_SHORT_GI_160;
 	}
 	/* all support 256-QAM */
-	mcs_map = brcmf_get_mcs_map(nchain, IEEE80211_VHT_MCS_SUPPORT_0_9);
+	mcs_map = brcmf_get_mcs_map(rxstreams, IEEE80211_VHT_MCS_SUPPORT_0_9);
 	band->vht_cap.vht_mcs.rx_mcs_map = mcs_map;
+	mcs_map = brcmf_get_mcs_map(txstreams, IEEE80211_VHT_MCS_SUPPORT_0_9);
+
 	band->vht_cap.vht_mcs.tx_mcs_map = mcs_map;
 
 	/* Beamforming support information */
@@ -7294,11 +7313,15 @@ static void brcmf_update_vht_cap(struct ieee80211_supported_band *band,
 	if ((txbf_bfe_cap || txbf_bfr_cap) && (txstreams > 1)) {
 		band->vht_cap.cap |=
 			(2 << IEEE80211_VHT_CAP_BEAMFORMEE_STS_SHIFT);
-		band->vht_cap.cap |= ((txstreams - 1) <<
-				IEEE80211_VHT_CAP_SOUNDING_DIMENSIONS_SHIFT);
+		band->vht_cap.cap |=
+			((txstreams - 1)
+			 << IEEE80211_VHT_CAP_SOUNDING_DIMENSIONS_SHIFT);
 		band->vht_cap.cap |=
 			IEEE80211_VHT_CAP_VHT_LINK_ADAPTATION_VHT_MRQ_MFB;
 	}
+	/* AMPDU length limit, support max 1MB (2 ^ (13 + 7)) */
+	band->vht_cap.cap |=
+		(7 << IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_SHIFT);
 }
 
 static int brcmf_setup_wiphybands(struct brcmf_cfg80211_info *cfg)
@@ -7315,10 +7338,17 @@ static int brcmf_setup_wiphybands(struct brcmf_cfg80211_info *cfg)
 	s32 i;
 	struct ieee80211_supported_band *band;
 	u32 txstreams = 0;
+	u32 rxstreams = 0;
 	u32 txbf_bfe_cap = 0;
 	u32 txbf_bfr_cap = 0;
+	u32 ldpc_cap = 0;
+	u32 stbc_rx = 0;
+	u32 stbc_tx = 0;
 
 	(void)brcmf_fil_iovar_int_get(ifp, "vhtmode", &vhtmode);
+	(void)brcmf_fil_iovar_int_get(ifp, "ldpc_cap", &ldpc_cap);
+	(void)brcmf_fil_iovar_int_get(ifp, "stbc_rx", &stbc_rx);
+	(void)brcmf_fil_iovar_int_get(ifp, "stbc_tx", &stbc_tx);
 	err = brcmf_fil_iovar_int_get(ifp, "nmode", &nmode);
 	if (err) {
 		bphy_err(drvr, "nmode error (%d)\n", err);
@@ -7351,6 +7381,7 @@ static int brcmf_setup_wiphybands(struct brcmf_cfg80211_info *cfg)
 	}
 
 	if (vhtmode) {
+		(void)brcmf_fil_iovar_int_get(ifp, "rxstreams", &rxstreams);
 		(void)brcmf_fil_iovar_int_get(ifp, "txstreams", &txstreams);
 		(void)brcmf_fil_iovar_int_get(ifp, "txbf_bfe_cap",
 					      &txbf_bfe_cap);
@@ -7366,8 +7397,9 @@ static int brcmf_setup_wiphybands(struct brcmf_cfg80211_info *cfg)
 		if (nmode)
 			brcmf_update_ht_cap(band, bw_cap, nchain);
 		if (vhtmode)
-			brcmf_update_vht_cap(band, bw_cap, nchain, txstreams,
-					     txbf_bfe_cap, txbf_bfr_cap);
+			brcmf_update_vht_cap(band, bw_cap, txstreams, rxstreams,
+					     txbf_bfe_cap, txbf_bfr_cap,
+					     ldpc_cap, stbc_rx, stbc_tx);
 	}
 
 	return 0;