ath11k: enable 802.11 power save mode in station mode

To reduce power consumption enable 802.11 power save mode in station mode. This
allows both radio and CPU to sleep more.

Only enable the mode on QCA6390 and WCN6855, it's unknown how other hardware
families support this feature.

To test that power save mode is running run "iw dev wls1 set power_save off",
check there is no NULL Data frame seen by a sniffer. And run "iw dev wls1 set power_save
on" and check there is a NULL Data frame in sniffer.

Tested-on: QCA6390 hw2.0 PCI WLAN.HST.1.0.1-01740-QCAHSTSWPLZ_V2_TO_X86-1

Signed-off-by: Carl Huang <cjhuang@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20211108123826.8463-2-kvalo@codeaurora.org

drivers/net/wireless/ath/ath11k/core.c

@@ -76,6 +76,7 @@ static const struct ath11k_hw_params ath11k_hw_params[] = {
 		.supports_monitor = true,
 		.supports_shadow_regs = false,
 		.idle_ps = false,
+		.supports_sta_ps = false,
 		.cold_boot_calib = true,
 		.supports_suspend = false,
 		.hal_desc_sz = sizeof(struct hal_rx_desc_ipq8074),
@@ -126,6 +127,7 @@ static const struct ath11k_hw_params ath11k_hw_params[] = {
 		.supports_monitor = true,
 		.supports_shadow_regs = false,
 		.idle_ps = false,
+		.supports_sta_ps = false,
 		.cold_boot_calib = true,
 		.supports_suspend = false,
 		.hal_desc_sz = sizeof(struct hal_rx_desc_ipq8074),
@@ -175,6 +177,7 @@ static const struct ath11k_hw_params ath11k_hw_params[] = {
 		.supports_monitor = false,
 		.supports_shadow_regs = true,
 		.idle_ps = true,
+		.supports_sta_ps = true,
 		.cold_boot_calib = false,
 		.supports_suspend = true,
 		.hal_desc_sz = sizeof(struct hal_rx_desc_ipq8074),
@@ -224,6 +227,7 @@ static const struct ath11k_hw_params ath11k_hw_params[] = {
 		.supports_monitor = true,
 		.supports_shadow_regs = false,
 		.idle_ps = false,
+		.supports_sta_ps = false,
 		.cold_boot_calib = false,
 		.supports_suspend = false,
 		.hal_desc_sz = sizeof(struct hal_rx_desc_qcn9074),
@@ -273,6 +277,7 @@ static const struct ath11k_hw_params ath11k_hw_params[] = {
 		.supports_monitor = false,
 		.supports_shadow_regs = true,
 		.idle_ps = true,
+		.supports_sta_ps = true,
 		.cold_boot_calib = false,
 		.supports_suspend = true,
 		.hal_desc_sz = sizeof(struct hal_rx_desc_wcn6855),

drivers/net/wireless/ath/ath11k/core.h

@@ -240,6 +240,7 @@ struct ath11k_vif {
 	bool is_started;
 	bool is_up;
 	bool spectral_enabled;
+	bool ps;
 	u32 aid;
 	u8 bssid[ETH_ALEN];
 	struct cfg80211_bitrate_mask bitrate_mask;

drivers/net/wireless/ath/ath11k/hw.h

@@ -170,6 +170,7 @@ struct ath11k_hw_params {
 	bool supports_monitor;
 	bool supports_shadow_regs;
 	bool idle_ps;
+	bool supports_sta_ps;
 	bool cold_boot_calib;
 	bool supports_suspend;
 	u32 hal_desc_sz;

drivers/net/wireless/ath/ath11k/mac.c

@@ -1049,6 +1049,83 @@ static int ath11k_mac_monitor_stop(struct ath11k *ar)
 	return 0;
 }
 
+static int ath11k_mac_vif_setup_ps(struct ath11k_vif *arvif)
+{
+	struct ath11k *ar = arvif->ar;
+	struct ieee80211_vif *vif = arvif->vif;
+	struct ieee80211_conf *conf = &ar->hw->conf;
+	enum wmi_sta_powersave_param param;
+	enum wmi_sta_ps_mode psmode;
+	int ret;
+	int timeout;
+	bool enable_ps;
+
+	lockdep_assert_held(&arvif->ar->conf_mutex);
+
+	if (arvif->vif->type != NL80211_IFTYPE_STATION)
+		return 0;
+
+	enable_ps = arvif->ps;
+
+	if (!arvif->is_started) {
+		/* mac80211 can update vif powersave state while disconnected.
+		 * Firmware doesn't behave nicely and consumes more power than
+		 * necessary if PS is disabled on a non-started vdev. Hence
+		 * force-enable PS for non-running vdevs.
+		 */
+		psmode = WMI_STA_PS_MODE_ENABLED;
+	} else if (enable_ps) {
+		psmode = WMI_STA_PS_MODE_ENABLED;
+		param = WMI_STA_PS_PARAM_INACTIVITY_TIME;
+
+		timeout = conf->dynamic_ps_timeout;
+		if (timeout == 0) {
+			/* firmware doesn't like 0 */
+			timeout = ieee80211_tu_to_usec(vif->bss_conf.beacon_int) / 1000;
+		}
+
+		ret = ath11k_wmi_set_sta_ps_param(ar, arvif->vdev_id, param,
+						  timeout);
+		if (ret) {
+			ath11k_warn(ar->ab, "failed to set inactivity time for vdev %d: %i\n",
+				    arvif->vdev_id, ret);
+			return ret;
+		}
+	} else {
+		psmode = WMI_STA_PS_MODE_DISABLED;
+	}
+
+	ath11k_dbg(ar->ab, ATH11K_DBG_MAC, "mac vdev %d psmode %s\n",
+		   arvif->vdev_id, psmode ? "enable" : "disable");
+
+	ret = ath11k_wmi_pdev_set_ps_mode(ar, arvif->vdev_id, psmode);
+	if (ret) {
+		ath11k_warn(ar->ab, "failed to set sta power save mode %d for vdev %d: %d\n",
+			    psmode, arvif->vdev_id, ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int ath11k_mac_config_ps(struct ath11k *ar)
+{
+	struct ath11k_vif *arvif;
+	int ret = 0;
+
+	lockdep_assert_held(&ar->conf_mutex);
+
+	list_for_each_entry(arvif, &ar->arvifs, list) {
+		ret = ath11k_mac_vif_setup_ps(arvif);
+		if (ret) {
+			ath11k_warn(ar->ab, "failed to setup powersave: %d\n", ret);
+			break;
+		}
+	}
+
+	return ret;
+}
+
 static int ath11k_mac_op_config(struct ieee80211_hw *hw, u32 changed)
 {
 	struct ath11k *ar = hw->priv;
@@ -2942,6 +3019,16 @@ static void ath11k_mac_op_bss_info_changed(struct ieee80211_hw *hw,
 		ath11k_mac_txpower_recalc(ar);
 	}
 
+	if (changed & BSS_CHANGED_PS &&
+	    ar->ab->hw_params.supports_sta_ps) {
+		arvif->ps = vif->bss_conf.ps;
+
+		ret = ath11k_mac_config_ps(ar);
+		if (ret)
+			ath11k_warn(ar->ab, "failed to setup ps on vdev %i: %d\n",
+				    arvif->vdev_id, ret);
+	}
+
 	if (changed & BSS_CHANGED_MCAST_RATE &&
 	    !ath11k_mac_vif_chan(arvif->vif, &def)) {
 		band = def.chan->band;