linux-kernel - [PATCH mt76] wifi: mt76: mt7915: sync station power save state

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Message-ID: <20260210201917.993424-1-mail@david-bauer.net>
Date: Tue, 10 Feb 2026 21:19:14 +0100
From: David Bauer <mail@...id-bauer.net>
To: Felix Fietkau <nbd@....name>,
	Lorenzo Bianconi <lorenzo@...nel.org>,
	Ryder Lee <ryder.lee@...iatek.com>,
	Shayne Chen <shayne.chen@...iatek.com>,
	Sean Wang <sean.wang@...iatek.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Cc: linux-wireless@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org
Subject: [PATCH mt76] wifi: mt76: mt7915: sync station power save state

Host receives a power save state change event everytime a station enters
or leaves PS mode. Use this unsolicited event to stop filling up TX
queues in firmware, as the hardware will buffer frames for stations in
power safe indefinitely.

Limit packets to be enqueued for sleeping STAs in order to manage the
packet backlog in the host-system while still being able to indicate
pending traffic to said STAs.

Signed-off-by: David Bauer <mail@...id-bauer.net>
---
 .../net/wireless/mediatek/mt76/mt7915/main.c  |  1 +
 .../net/wireless/mediatek/mt76/mt7915/mcu.c   | 28 +++++++++++++++++++
 .../net/wireless/mediatek/mt76/mt7915/mcu.h   |  9 ++++++
 3 files changed, 38 insertions(+)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/main.c b/drivers/net/wireless/mediatek/mt76/mt7915/main.c
index 90d5e79fbf74d..71b94db64ef6d 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/main.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/main.c
@@ -1783,6 +1783,7 @@ const struct ieee80211_ops mt7915_ops = {
 	.sw_scan_complete = mt76_sw_scan_complete,
 	.release_buffered_frames = mt76_release_buffered_frames,
 	.get_txpower = mt76_get_txpower,
+	.set_tim = mt76_set_tim,
 	.set_sar_specs = mt7915_set_sar_specs,
 	.channel_switch_beacon = mt7915_channel_switch_beacon,
 	.get_stats = mt7915_get_stats,
diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c b/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c
index 00bff4d3aab80..8b4a5973b240c 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c
@@ -402,6 +402,31 @@ mt7915_mcu_rx_bcc_notify(struct mt7915_dev *dev, struct sk_buff *skb)
 			mt7915_mcu_cca_finish, mphy->hw);
 }
 
+static void mt7915_mcu_rx_ps_sync(struct mt7915_dev *dev, struct sk_buff *skb)
+{
+	struct mt7915_mcu_ps_notify *p;
+	struct ieee80211_sta *sta;
+	struct mt76_wcid *wcid;
+	u16 wcid_idx;
+
+	p = (struct mt7915_mcu_ps_notify *)skb->data;
+	wcid_idx = p->wtbl_lower | (p->wtbl_higher) << 8;
+
+	rcu_read_lock();
+	wcid = mt76_wcid_ptr(dev, wcid_idx);
+	if (!wcid)
+		goto out;
+
+	sta = wcid_to_sta(wcid);
+	if (!sta)
+		goto out;
+
+	ieee80211_sta_ps_transition_ni(sta, !!p->ps_bit);
+
+out:
+	rcu_read_unlock();
+}
+
 static void
 mt7915_mcu_rx_ext_event(struct mt7915_dev *dev, struct sk_buff *skb)
 {
@@ -424,6 +449,9 @@ mt7915_mcu_rx_ext_event(struct mt7915_dev *dev, struct sk_buff *skb)
 	case MCU_EXT_EVENT_BCC_NOTIFY:
 		mt7915_mcu_rx_bcc_notify(dev, skb);
 		break;
+	case MCU_EXT_EVENT_PS_SYNC:
+		mt7915_mcu_rx_ps_sync(dev, skb);
+		break;
 	default:
 		break;
 	}
diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mcu.h b/drivers/net/wireless/mediatek/mt76/mt7915/mcu.h
index 3af11a075a2f4..836fe46393256 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/mcu.h
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/mcu.h
@@ -54,6 +54,15 @@ struct mt7915_mcu_bcc_notify {
 	u8 rsv;
 } __packed;
 
+struct mt7915_mcu_ps_notify {
+	struct mt76_connac2_mcu_rxd_hdr rxd;
+
+	u8 wtbl_lower;
+	u8 ps_bit;
+	u8 wtbl_higher;
+	u8 rsv;
+} __packed;
+
 struct mt7915_mcu_rdd_report {
 	struct mt76_connac2_mcu_rxd_hdr rxd;
 
-- 
2.51.0