mt76: mt7921: introduce 802.11 PS support in sta mode

Enable 802.11 power-save support available in mt7921 firmware
Co-developed-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Co-developed-by: Soul Huang <Soul.Huang@mediatek.com>
Signed-off-by: Soul Huang <Soul.Huang@mediatek.com>
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt7921/init.c

@@ -83,6 +83,8 @@ mt7921_init_wiphy(struct ieee80211_hw *hw)
 	ieee80211_hw_set(hw, HAS_RATE_CONTROL);
 	ieee80211_hw_set(hw, SUPPORTS_TX_ENCAP_OFFLOAD);
 	ieee80211_hw_set(hw, WANT_MONITOR_VIF);
+	ieee80211_hw_set(hw, SUPPORTS_PS);
+	ieee80211_hw_set(hw, SUPPORTS_DYNAMIC_PS);
 
 	hw->max_tx_fragments = 4;
 }

drivers/net/wireless/mediatek/mt76/mt7921/mac.c

@@ -690,8 +690,7 @@ void mt7921_mac_write_txwi(struct mt7921_dev *dev, __le32 *txwi,
 	txwi[1] = cpu_to_le32(val);
 	txwi[2] = 0;
 
-	val = MT_TXD3_SW_POWER_MGMT |
-	      FIELD_PREP(MT_TXD3_REM_TX_COUNT, tx_count);
+	val = FIELD_PREP(MT_TXD3_REM_TX_COUNT, tx_count);
 	if (key)
 		val |= MT_TXD3_PROTECT_FRAME;
 	if (info->flags & IEEE80211_TX_CTL_NO_ACK)

drivers/net/wireless/mediatek/mt76/mt7921/main.c

@@ -561,6 +561,9 @@ static void mt7921_bss_info_changed(struct ieee80211_hw *hw,
 	if (changed & (BSS_CHANGED_QOS | BSS_CHANGED_BEACON_ENABLED))
 		mt7921_mcu_set_tx(dev, vif);
 
+	if (changed & BSS_CHANGED_PS)
+		mt7921_mcu_uni_bss_ps(dev, vif);
+
 	mutex_unlock(&dev->mt76.mutex);
 }
 

drivers/net/wireless/mediatek/mt76/mt7921/mcu.c

@@ -2463,3 +2463,40 @@ u32 mt7921_get_wtbl_info(struct mt7921_dev *dev, u16 wlan_idx)
 
 	return 0;
 }
+
+int mt7921_mcu_uni_bss_ps(struct mt7921_dev *dev, struct ieee80211_vif *vif)
+{
+	struct mt7921_vif *mvif = (struct mt7921_vif *)vif->drv_priv;
+	struct {
+		struct {
+			u8 bss_idx;
+			u8 pad[3];
+		} __packed hdr;
+		struct ps_tlv {
+			__le16 tag;
+			__le16 len;
+			u8 ps_state; /* 0: device awake
+				      * 1: static power save
+				      * 2: dynamic power saving
+				      * 3: enter TWT power saving
+				      * 4: leave TWT power saving
+				      */
+			u8 pad[3];
+		} __packed ps;
+	} __packed ps_req = {
+		.hdr = {
+			.bss_idx = mvif->mt76.idx,
+		},
+		.ps = {
+			.tag = cpu_to_le16(UNI_BSS_INFO_PS),
+			.len = cpu_to_le16(sizeof(struct ps_tlv)),
+			.ps_state = vif->bss_conf.ps ? 2 : 0,
+		},
+	};
+
+	if (vif->type != NL80211_IFTYPE_STATION)
+		return -EOPNOTSUPP;
+
+	return mt76_mcu_send_msg(&dev->mt76, MCU_UNI_CMD_BSS_INFO_UPDATE,
+				 &ps_req, sizeof(ps_req), true);
+}

drivers/net/wireless/mediatek/mt76/mt7921/mcu.h

@@ -185,7 +185,6 @@ struct mt7921_mcu_uni_event {
 /* offload mcu commands */
 enum {
 	MCU_CMD_START_HW_SCAN = MCU_CE_PREFIX | 0x03,
-	MCU_CMD_SET_PS_PROFILE = MCU_CE_PREFIX | 0x05,
 	MCU_CMD_SET_CHAN_DOMAIN = MCU_CE_PREFIX | 0x0f,
 	MCU_CMD_SET_BSS_CONNECTED = MCU_CE_PREFIX | 0x16,
 	MCU_CMD_SET_BSS_ABORT = MCU_CE_PREFIX | 0x17,
@@ -211,6 +210,7 @@ enum {
 	UNI_BSS_INFO_BCN_CONTENT = 7,
 	UNI_BSS_INFO_QBSS = 15,
 	UNI_BSS_INFO_UAPSD = 19,
+	UNI_BSS_INFO_PS = 21,
 };
 
 enum {

drivers/net/wireless/mediatek/mt76/mt7921/mt7921.h

@@ -355,4 +355,5 @@ int mt7921_mcu_sched_scan_enable(struct mt7921_phy *phy,
 int mt7921_mcu_cancel_hw_scan(struct mt7921_phy *phy,
 			      struct ieee80211_vif *vif);
 u32 mt7921_get_wtbl_info(struct mt7921_dev *dev, u16 wlan_idx);
+int mt7921_mcu_uni_bss_ps(struct mt7921_dev *dev, struct ieee80211_vif *vif);
 #endif