mt76: mt7915: add support for DT rate power limits

Enable to limit per-rate max txpower from DT.
Tested-by: Evelyn Tsai <evelyn.tsai@mediatek.com>
Signed-off-by: Shayne Chen <shayne.chen@mediatek.com>
Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt7915/mcu.c

@@ -3517,15 +3517,47 @@ int mt7915_mcu_set_sku(struct mt7915_phy *phy)
 		.format_id = 4,
 		.dbdc_idx = phy != &dev->phy,
 	};
-	int i;
-	s8 *delta;
+	struct mt76_power_limits limits_array;
+	s8 *delta, *la = (s8 *)&limits_array;
+	int i, idx, n_chains = hweight8(mphy->antenna_mask);
+	int tx_power;
 
 	delta = dev->rate_power[mphy->chandef.chan->band];
-	mphy->txpower_cur = hw->conf.power_level * 2 +
-			    delta[MT7915_SKU_MAX_DELTA_IDX];
+	tx_power = hw->conf.power_level * 2 -
+		   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;
+
+	for (i = 0, idx = 0; i < MAX_SKU_RATE_GROUP_NUM; i++) {
+		const struct sku_group *sku = &mt7915_sku_groups[i];
+		u32 offset = sku->offset[mphy->chandef.chan->band];
+		u8 mcs_num = sku->len;
+		int j;
+
+		if (i >= SKU_HT_BW20 && i <= SKU_VHT_BW160) {
+			mcs_num = 10;
+
+			if (i == SKU_HT_BW20 || i == SKU_VHT_BW20)
+				la = (s8 *)&limits_array + 12;
+		}
 
-	for (i = 0; i < MT7915_SKU_RATE_NUM; i++)
-		req.val[i] = hw->conf.power_level * 2 + delta[i];
+		if (!offset) {
+			idx += sku->len;
+			la += mcs_num;
+			continue;
+		}
+
+		for (j = 0; j < min_t(u8, mcs_num, sku->len); j++) {
+			s8 rate_power;
+
+			rate_power = hw->conf.power_level * 2 + delta[idx + j];
+			req.val[idx + j] = min_t(s8, la[j], rate_power);
+		}
+		la += mcs_num;
+		idx += sku->len;
+	}
 
 	return mt76_mcu_send_msg(&dev->mt76,
 				 MCU_EXT_CMD(TX_POWER_FEATURE_CTRL), &req,