[PATCH v2 1/3] wifi: mt76: mt7915: rework mt7915_thermal_set_cur_throttle_state()

[Howard Hsu]

This patch includes 3 changes:
1. The maximum throttle state can be set to 100 to fix the problem that
thermal_protect_disable can never be triggered.
2. Throttle state do not need to be different from the previous state.
This will make it is impossible for users to just change the
trigger/restore temp but not the throttle state.
3. Add dev_err so that it is easier to see invalid setting while looking at dmesg.

Fixes: 771cd8d4c369 ("mt76: mt7915e: Fix degraded performance after temporary overheat")
Co-developed-by: Ryder Lee <ryder.lee at mediatek.com>
Signed-off-by: Ryder Lee <ryder.lee at mediatek.com>
Signed-off-by: Howard Hsu <howard-yh.hsu at mediatek.com>
---
 .../net/wireless/mediatek/mt76/mt7915/init.c   | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/init.c b/drivers/net/wireless/mediatek/mt76/mt7915/init.c
index c810c31fbd6e..abeecf15f1c8 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/init.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/init.c
@@ -131,14 +131,17 @@ mt7915_thermal_set_cur_throttle_state(struct thermal_cooling_device *cdev,
 	u8 throttling = MT7915_THERMAL_THROTTLE_MAX - state;
 	int ret;
 
-	if (state > MT7915_CDEV_THROTTLE_MAX)
+	if (state > MT7915_THERMAL_THROTTLE_MAX) {
+		dev_err(phy->dev->mt76.dev,
+			"please specify a valid throttling state\n");
 		return -EINVAL;
+	}
 
-	if (phy->throttle_temp[0] > phy->throttle_temp[1])
-		return 0;
-
-	if (state == phy->cdev_state)
-		return 0;
+	if (phy->throttle_temp[0] > phy->throttle_temp[1]) {
+		dev_err(phy->dev->mt76.dev,
+			"temp1_crit shall not be greater than temp1_max\n");
+		return -EINVAL;
+	}
 
 	/*
 	 * cooling_device convention: 0 = no cooling, more = more cooling
@@ -164,7 +167,7 @@ static void mt7915_unregister_thermal(struct mt7915_phy *phy)
 	struct wiphy *wiphy = phy->mt76->hw->wiphy;
 
 	if (!phy->cdev)
-	    return;
+		return;
 
 	sysfs_remove_link(&wiphy->dev.kobj, "cooling_device");
 	thermal_cooling_device_unregister(phy->cdev);
@@ -1101,7 +1104,6 @@ static void mt7915_stop_hardware(struct mt7915_dev *dev)
 		mt7986_wmac_disable(dev);
 }
 
-
 int mt7915_register_device(struct mt7915_dev *dev)
 {
 	struct ieee80211_hw *hw = mt76_hw(dev);
-- 
2.18.0