From: Felix Fietkau <nbd@nbd.name>
To: linux-wireless@vger.kernel.org
Subject: [PATCH 1/4] mt76: mt7615: fix using VHT STBC rates
Date: Fri, 12 Jul 2019 08:20:42 +0200 [thread overview]
Message-ID: <20190712062045.85109-1-nbd@nbd.name> (raw)
The hardware expects MT_TX_RATE_NSS to be filled with the number of
space/time streams. For non-STBC rates, this is equal to nss.
For 1-stream STBC, this needs to be set to 2.
This is relevant for VHT rates only, on HT, the value is derived from MCS
internally.
Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
.../net/wireless/mediatek/mt76/mt7615/mac.c | 18 ++++++++++++------
1 file changed, 12 insertions(+), 6 deletions(-)
diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/mac.c b/drivers/net/wireless/mediatek/mt76/mt7615/mac.c
index 5bfb4594b8ee..6c21b2df69c4 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7615/mac.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7615/mac.c
@@ -254,7 +254,7 @@ mt7615_mac_tx_rate_val(struct mt7615_dev *dev,
bool stbc, u8 *bw)
{
u8 phy, nss, rate_idx;
- u16 rateval;
+ u16 rateval = 0;
*bw = 0;
@@ -292,12 +292,14 @@ mt7615_mac_tx_rate_val(struct mt7615_dev *dev,
rate_idx = val & 0xff;
}
- rateval = (FIELD_PREP(MT_TX_RATE_IDX, rate_idx) |
- FIELD_PREP(MT_TX_RATE_MODE, phy) |
- FIELD_PREP(MT_TX_RATE_NSS, nss - 1));
-
- if (stbc && nss == 1)
+ if (stbc && nss == 1) {
+ nss++;
rateval |= MT_TX_RATE_STBC;
+ }
+
+ rateval |= (FIELD_PREP(MT_TX_RATE_IDX, rate_idx) |
+ FIELD_PREP(MT_TX_RATE_MODE, phy) |
+ FIELD_PREP(MT_TX_RATE_NSS, nss - 1));
return rateval;
}
@@ -771,6 +773,10 @@ static bool mt7615_fill_txs(struct mt7615_dev *dev, struct mt7615_sta *sta,
break;
case MT_PHY_TYPE_VHT:
final_nss = FIELD_GET(MT_TX_RATE_NSS, final_rate);
+
+ if ((final_rate & MT_TX_RATE_STBC) && final_nss)
+ final_nss--;
+
final_rate_flags |= IEEE80211_TX_RC_VHT_MCS;
final_rate = (final_rate & MT_TX_RATE_IDX) | (final_nss << 4);
break;
--
2.17.0
next reply other threads:[~2019-07-12 6:20 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-12 6:20 Felix Fietkau [this message]
2019-07-12 6:20 ` [PATCH 2/4] mt76: mt7615: fix PS buffering of action frames Felix Fietkau
2019-07-12 6:20 ` [PATCH 3/4] mt76: mt7615: fix invalid fallback rates Felix Fietkau
2019-07-12 6:20 ` [PATCH 4/4] mt76: mt7603: " Felix Fietkau
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