From 2c70627b09aced3593d8b9419b908f5e1a13318a Mon Sep 17 00:00:00 2001
From: Lorenzo Bianconi <lorenzo@kernel.org>
Date: Tue, 23 Nov 2021 17:24:31 +0100
Subject: [PATCH] mt76: mt7915: introduce SAR support
Git-commit: 2c70627b09aced3593d8b9419b908f5e1a13318a
Patch-mainline: v5.17-rc1
References: bsc#1209980

Add SAR spec support to mt7915 driver to allow configuring SAR power
limitations on the frequency ranges from the userland.

Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 .../net/wireless/mediatek/mt76/mt7915/main.c  | 23 +++++++++++++++++++
 .../net/wireless/mediatek/mt76/mt7915/mcu.c   |  8 +++----
 2 files changed, 27 insertions(+), 4 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/main.c b/drivers/net/wireless/mediatek/mt76/mt7915/main.c
index 8c1fa08b6286..31fceeed1a72 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/main.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/main.c
@@ -423,6 +423,28 @@ static int mt7915_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
 	return err;
 }
 
+static int mt7915_set_sar_specs(struct ieee80211_hw *hw,
+				const struct cfg80211_sar_specs *sar)
+{
+	struct mt7915_phy *phy = mt7915_hw_phy(hw);
+	struct mt7915_dev *dev = mt7915_hw_dev(hw);
+	int err = -EINVAL;
+
+	mutex_lock(&dev->mt76.mutex);
+	if (!cfg80211_chandef_valid(&phy->mt76->chandef))
+		goto out;
+
+	err = mt76_init_sar_power(hw, sar);
+	if (err)
+		goto out;
+
+	err = mt7915_mcu_set_txpower_sku(phy);
+out:
+	mutex_unlock(&dev->mt76.mutex);
+
+	return err;
+}
+
 static int mt7915_config(struct ieee80211_hw *hw, u32 changed)
 {
 	struct mt7915_dev *dev = mt7915_hw_dev(hw);
@@ -1329,6 +1351,7 @@ 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_sar_specs = mt7915_set_sar_specs,
 	.channel_switch_beacon = mt7915_channel_switch_beacon,
 	.get_stats = mt7915_get_stats,
 	.get_et_sset_count = mt7915_get_et_sset_count,
diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c b/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c
index 58ed82a8ad32..2cb009a39059 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c
@@ -3856,11 +3856,11 @@ int mt7915_mcu_set_txpower_sku(struct mt7915_phy *phy)
 	struct mt76_power_limits limits_array;
 	s8 *la = (s8 *)&limits_array;
 	int i, idx, n_chains = hweight8(mphy->antenna_mask);
-	int tx_power;
-
-	tx_power = hw->conf.power_level * 2 -
-		   mt76_tx_power_nss_delta(n_chains);
+	int tx_power = hw->conf.power_level * 2;
 
+	tx_power = mt76_get_sar_power(mphy, mphy->chandef.chan,
+				      tx_power);
+	tx_power -= mt76_tx_power_nss_delta(n_chains);
 	tx_power = mt76_get_rate_power_limits(mphy, mphy->chandef.chan,
 					      &limits_array, tx_power);
 	mphy->txpower_cur = tx_power;
-- 
2.35.3