wifi: mt76: mt7996: fix ldpc setting

JIRA: https://issues.redhat.com/browse/RHEL-79791

commit da8352d
Author: Peter Chiu <chui-hao.chiu@mediatek.com>
Date:   Tue Jan 14 18:10:24 2025 +0800

    wifi: mt76: mt7996: fix ldpc setting
    
    The non-AP interfaces would not use conf->vht_ldpc so they never set
    STA_CAP_VHT_LDPC even if peer-station support LDPC.
    Check conf->vht_ldpc only for AP interface.
    
    Without this patch, station only uses BCC to transmit packet in VHT mode.
    
    Fixes: dda423d ("wifi: mt76: mt7996: remove mt7996_mcu_beacon_check_caps()")
    Signed-off-by: Peter Chiu <chui-hao.chiu@mediatek.com>
    Signed-off-by: Shayne Chen <shayne.chen@mediatek.com>
    Link: https://patch.msgid.link/20250114101026.3587702-7-shayne.chen@mediatek.com
    Signed-off-by: Felix Fietkau <nbd@nbd.name>

Signed-off-by: Jose Ignacio Tornos Martinez <jtornosm@redhat.com>

Author: jtornosm

drivers/net/wireless/mediatek/mt76/mt7996/mcu.c

@@ -2066,7 +2066,7 @@ mt7996_mcu_sta_rate_ctrl_tlv(struct sk_buff *skb, struct mt7996_dev *dev,
 			cap |= STA_CAP_VHT_TX_STBC;
 		if (sta->deflink.vht_cap.cap & IEEE80211_VHT_CAP_RXSTBC_1)
 			cap |= STA_CAP_VHT_RX_STBC;
-		if (vif->bss_conf.vht_ldpc &&
+		if ((vif->type != NL80211_IFTYPE_AP || vif->bss_conf.vht_ldpc) &&
 		    (sta->deflink.vht_cap.cap & IEEE80211_VHT_CAP_RXLDPC))
 			cap |= STA_CAP_VHT_LDPC;