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@@ -0,0 +1,49 @@
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+From: Felix Fietkau <[email protected]>
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+Date: Sun, 14 Feb 2021 19:45:50 +0100
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+Subject: [PATCH] ath9k: fix transmitting to stations in dynamic SMPS mode
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+
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+When transmitting to a receiver in dynamic SMPS mode, all transmissions that
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+use multiple spatial streams need to be sent using CTS-to-self or RTS/CTS to
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+give the receiver's extra chains some time to wake up.
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+This fixes the tx rate getting stuck at <= MCS7 for some clients, especially
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+Intel ones, which make aggressive use of SMPS.
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+
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+Cc: [email protected]
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+Reported-by: Martin Kennedy <[email protected]>
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+Signed-off-by: Felix Fietkau <[email protected]>
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+---
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+
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+--- a/drivers/net/wireless/ath/ath9k/ath9k.h
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++++ b/drivers/net/wireless/ath/ath9k/ath9k.h
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+@@ -179,7 +179,8 @@ struct ath_frame_info {
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+ s8 txq;
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+ u8 keyix;
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+ u8 rtscts_rate;
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+- u8 retries : 7;
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++ u8 retries : 6;
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++ u8 dyn_smps : 1;
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+ u8 baw_tracked : 1;
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+ u8 tx_power;
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+ enum ath9k_key_type keytype:2;
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+--- a/drivers/net/wireless/ath/ath9k/xmit.c
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++++ b/drivers/net/wireless/ath/ath9k/xmit.c
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+@@ -1271,6 +1271,11 @@ static void ath_buf_set_rate(struct ath_
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+ is_40, is_sgi, is_sp);
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+ if (rix < 8 && (tx_info->flags & IEEE80211_TX_CTL_STBC))
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+ info->rates[i].RateFlags |= ATH9K_RATESERIES_STBC;
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++ if (rix >= 8 && fi->dyn_smps) {
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++ info->rates[i].RateFlags |=
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++ ATH9K_RATESERIES_RTS_CTS;
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++ info->flags |= ATH9K_TXDESC_CTSENA;
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++ }
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+
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+ info->txpower[i] = ath_get_rate_txpower(sc, bf, rix,
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+ is_40, false);
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+@@ -2114,6 +2119,7 @@ static void setup_frame_info(struct ieee
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+ fi->keyix = an->ps_key;
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+ else
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+ fi->keyix = ATH9K_TXKEYIX_INVALID;
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++ fi->dyn_smps = sta && sta->smps_mode == IEEE80211_SMPS_DYNAMIC;
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+ fi->keytype = keytype;
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+ fi->framelen = framelen;
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+ fi->tx_power = txpower;
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Felix Fietkau