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wifi: rtw89: disable CSI STBC for VHT 160MHz

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Fix interoperability problem where CSI feedback with STBC enabled at
VHT 160MHz BW cannot be properly decoded by certain APs, causing CSI
reports to be rejected. This problem is specific to Wi-Fi 7 chips,
as Wi-Fi 6 defaults to 20MHz CSI BW. Therefore, disable STBC encoding
for CSI transmission in VHT 160MHz mode to ensure CSI feedback is
accepted by these APs and maintain smooth throughput.

Signed-off-by: Dian-Syuan Yang <dian_syuan0116@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Link: https://patch.msgid.link/20260424072552.59220-4-pkshih@realtek.com
This commit is contained in:
Dian-Syuan Yang 2026-04-24 15:25:52 +08:00 committed by Ping-Ke Shih
parent 1e53b826d5
commit d1fba55228
1 changed files with 4 additions and 0 deletions
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4
drivers/net/wireless/realtek/rtw89/mac_be.c
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@ -2805,6 +2805,10 @@ static int rtw89_mac_set_csi_para_reg_be(struct rtw89_dev *rtwdev,
sound_dim = min(sound_dim, t);
}
/* Disable stbc_en in VHT 160MHz to avoid IOT issues with certain APs */
if (link_sta->vht_cap.cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ)
stbc_en = 0;
nc = min(nc, sound_dim);
nr = min(nr, sound_dim);