From cea5b03d8a10f718823692a617f738d9cbae193f Mon Sep 17 00:00:00 2001 From: Stanislaw Gruszka Date: Fri, 18 Nov 2016 10:43:53 +0100 Subject: [PATCH] rt2800: correctly report MCS TX parameters We should only set IEEE80211_HT_MCS_TX_RX_DIF when TX and RX MCS sets are not equal, i.e. when number of tx streams is different than number of RX streams. Signed-off-by: Stanislaw Gruszka Signed-off-by: Kalle Valo --- .../net/wireless/ralink/rt2x00/rt2800lib.c | 23 +++++++++++-------- 1 file changed, 13 insertions(+), 10 deletions(-) diff --git a/drivers/net/wireless/ralink/rt2x00/rt2800lib.c b/drivers/net/wireless/ralink/rt2x00/rt2800lib.c index 59c49af21745..9c01622f9947 100644 --- a/drivers/net/wireless/ralink/rt2x00/rt2800lib.c +++ b/drivers/net/wireless/ralink/rt2x00/rt2800lib.c @@ -7461,7 +7461,7 @@ static int rt2800_probe_hw_mode(struct rt2x00_dev *rt2x00dev) char *default_power1; char *default_power2; char *default_power3; - unsigned int i; + unsigned int i, tx_chains, rx_chains; u32 reg; /* @@ -7586,21 +7586,24 @@ static int rt2800_probe_hw_mode(struct rt2x00_dev *rt2x00dev) IEEE80211_HT_CAP_SGI_20 | IEEE80211_HT_CAP_SGI_40; - if (rt2x00dev->default_ant.tx_chain_num >= 2) + tx_chains = rt2x00dev->default_ant.tx_chain_num; + rx_chains = rt2x00dev->default_ant.rx_chain_num; + + if (tx_chains >= 2) spec->ht.cap |= IEEE80211_HT_CAP_TX_STBC; - spec->ht.cap |= rt2x00dev->default_ant.rx_chain_num << - IEEE80211_HT_CAP_RX_STBC_SHIFT; + spec->ht.cap |= rx_chains << IEEE80211_HT_CAP_RX_STBC_SHIFT; spec->ht.ampdu_factor = 3; spec->ht.ampdu_density = 4; - spec->ht.mcs.tx_params = - IEEE80211_HT_MCS_TX_DEFINED | - IEEE80211_HT_MCS_TX_RX_DIFF | - ((rt2x00dev->default_ant.tx_chain_num - 1) << - IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT); + spec->ht.mcs.tx_params = IEEE80211_HT_MCS_TX_DEFINED; + if (tx_chains != rx_chains) { + spec->ht.mcs.tx_params |= IEEE80211_HT_MCS_TX_RX_DIFF; + spec->ht.mcs.tx_params |= + (tx_chains - 1) << IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT; + } - switch (rt2x00dev->default_ant.rx_chain_num) { + switch (rx_chains) { case 3: spec->ht.mcs.rx_mask[2] = 0xff; case 2: -- 2.20.1