mt76: mt7615: add runtime-pm knob in mt7615 debugfs

Introduce runtime-pm knob in mt7615 debugfs in order to enable/disable
runtime pm available in offload firmware
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt7615/debugfs.c

@@ -51,6 +51,29 @@ mt7615_scs_get(void *data, u64 *val)
 DEFINE_DEBUGFS_ATTRIBUTE(fops_scs, mt7615_scs_get,
 			 mt7615_scs_set, "%lld\n");
 
+static int
+mt7615_pm_set(void *data, u64 val)
+{
+	struct mt7615_dev *dev = data;
+
+	if (!mt7615_wait_for_mcu_init(dev))
+		return 0;
+
+	return mt7615_pm_set_enable(dev, val);
+}
+
+static int
+mt7615_pm_get(void *data, u64 *val)
+{
+	struct mt7615_dev *dev = data;
+
+	*val = dev->pm.enable;
+
+	return 0;
+}
+
+DEFINE_DEBUGFS_ATTRIBUTE(fops_pm, mt7615_pm_get, mt7615_pm_set, "%lld\n");
+
 static int
 mt7615_dbdc_set(void *data, u64 val)
 {
@@ -351,6 +374,7 @@ int mt7615_init_debugfs(struct mt7615_dev *dev)
 	debugfs_create_file("scs", 0600, dir, dev, &fops_scs);
 	debugfs_create_file("dbdc", 0600, dir, dev, &fops_dbdc);
 	debugfs_create_file("fw_debug", 0600, dir, dev, &fops_fw_debug);
+	debugfs_create_file("runtime-pm", 0600, dir, dev, &fops_pm);
 	debugfs_create_devm_seqfile(dev->mt76.dev, "radio", dir,
 				    mt7615_radio_read);
 	debugfs_create_u32("dfs_hw_pattern", 0400, dir, &dev->hw_pattern);

drivers/net/wireless/mediatek/mt76/mt7615/mac.c

@@ -1929,6 +1929,23 @@ void mt7615_pm_power_save_work(struct work_struct *work)
 				   MT7615_PM_TIMEOUT);
 }
 
+int mt7615_pm_set_enable(struct mt7615_dev *dev, bool enable)
+{
+	if (!mt7615_firmware_offload(dev) || !mt76_is_mmio(&dev->mt76))
+		return -EOPNOTSUPP;
+
+	mt7615_mutex_acquire(dev);
+
+	if (dev->pm.enable == enable)
+		goto out;
+
+	dev->pm.enable = enable;
+out:
+	mt7615_mutex_release(dev);
+
+	return 0;
+}
+
 void mt7615_mac_work(struct work_struct *work)
 {
 	struct mt7615_phy *phy;

drivers/net/wireless/mediatek/mt76/mt7615/mt7615.h

@@ -443,6 +443,7 @@ bool mt7615_wait_for_mcu_init(struct mt7615_dev *dev);
 void mt7615_mac_set_rates(struct mt7615_phy *phy, struct mt7615_sta *sta,
 			  struct ieee80211_tx_rate *probe_rate,
 			  struct ieee80211_tx_rate *rates);
+int mt7615_pm_set_enable(struct mt7615_dev *dev, bool enable);
 void mt7615_pm_wake_work(struct work_struct *work);
 int mt7615_pm_wake(struct mt7615_dev *dev);
 void mt7615_pm_power_save_sched(struct mt7615_dev *dev);