wifi: mt76: mt7921: add support to update fw capability with MTFG table

In ACPI enabled devices, mt7921 should read MTFG table from platform
hardware. Apply necessary settings for firmware capabilities through CLC
command.
Co-developed-by: Deren Wu <deren.wu@mediatek.com>
Signed-off-by: Deren Wu <deren.wu@mediatek.com>
Signed-off-by: Quan Zhou <quan.zhou@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt7921/acpi_sar.c

@@ -135,6 +135,22 @@ mt7921_asar_acpi_read_mtgs(struct mt7921_dev *dev, u8 **table, u8 version)
 	return ret;
 }
 
+/* MTFG : Flag Table */
+static int
+mt7921_asar_acpi_read_mtfg(struct mt7921_dev *dev, u8 **table)
+{
+	int len, ret;
+
+	ret = mt7921_acpi_read(dev, MT7921_ACPI_MTFG, table, &len);
+	if (ret)
+		return ret;
+
+	if (len < MT7921_ASAR_MIN_FG)
+		ret = -EINVAL;
+
+	return ret;
+}
+
 int mt7921_init_acpi_sar(struct mt7921_dev *dev)
 {
 	struct mt7921_acpi_sar *asar;
@@ -162,6 +178,12 @@ int mt7921_init_acpi_sar(struct mt7921_dev *dev)
 		asar->geo = NULL;
 	}
 
+	/* MTFG is optional */
+	ret = mt7921_asar_acpi_read_mtfg(dev, (u8 **)&asar->fg);
+	if (ret) {
+		devm_kfree(dev->mt76.dev, asar->fg);
+		asar->fg = NULL;
+	}
 	dev->phy.acpisar = asar;
 
 	return 0;
@@ -280,3 +302,36 @@ int mt7921_init_acpi_sar_power(struct mt7921_phy *phy, bool set_default)
 
 	return 0;
 }
+
+u8 mt7921_acpi_get_flags(struct mt7921_phy *phy)
+{
+	struct mt7921_asar_fg *fg;
+	struct {
+		u8 acpi_idx;
+		u8 chip_idx;
+	} map[] = {
+		{1, 1},
+		{4, 2},
+	};
+	u8 flags = BIT(0);
+	int i, j;
+
+	if (!phy->acpisar)
+		return 0;
+
+	fg = phy->acpisar->fg;
+	if (!fg)
+		return flags;
+
+	/* pickup necessary settings per device and
+	 * translate the index of bitmap for chip command.
+	 */
+	for (i = 0; i < fg->nr_flag; i++)
+		for (j = 0; j < ARRAY_SIZE(map); j++)
+			if (fg->flag[i] == map[j].acpi_idx) {
+				flags |= BIT(map[j].chip_idx);
+				break;
+			}
+
+	return flags;
+}

drivers/net/wireless/mediatek/mt76/mt7921/acpi_sar.h

@@ -8,10 +8,12 @@
 #define MT7921_ASAR_MAX_DYN		8
 #define MT7921_ASAR_MIN_GEO		3
 #define MT7921_ASAR_MAX_GEO		8
+#define MT7921_ASAR_MIN_FG		8
 
 #define MT7921_ACPI_MTCL		"MTCL"
 #define MT7921_ACPI_MTDS		"MTDS"
 #define MT7921_ACPI_MTGS		"MTGS"
+#define MT7921_ACPI_MTFG		"MTFG"
 
 struct mt7921_asar_dyn_limit {
 	u8 idx;
@@ -77,6 +79,15 @@ struct mt7921_asar_cl {
 	u8 cl6g[6];
 } __packed;
 
+struct mt7921_asar_fg {
+	u8 names[4];
+	u8 version;
+	u8 rsvd;
+	u8 nr_flag;
+	u8 rsvd1;
+	u8 flag[0];
+} __packed;
+
 struct mt7921_acpi_sar {
 	u8 ver;
 	union {
@@ -88,6 +99,7 @@ struct mt7921_acpi_sar {
 		struct mt7921_asar_geo_v2 *geo_v2;
 	};
 	struct mt7921_asar_cl *countrylist;
+	struct mt7921_asar_fg *fg;
 };
 
 #endif

drivers/net/wireless/mediatek/mt76/mt7921/mcu.c

@@ -1184,13 +1184,15 @@ int __mt7921_mcu_set_clc(struct mt7921_dev *dev, u8 *alpha2,
 		__le16 len;
 		u8 idx;
 		u8 env;
-		u8 pad1[2];
+		u8 acpi_conf;
+		u8 pad1;
 		u8 alpha2[2];
 		u8 type[2];
 		u8 rsvd[64];
 	} __packed req = {
 		.idx = idx,
 		.env = env_cap,
+		.acpi_conf = mt7921_acpi_get_flags(&dev->phy),
 	};
 	int ret, valid_cnt = 0;
 	u8 i, *pos;

drivers/net/wireless/mediatek/mt76/mt7921/mt7921.h

@@ -554,6 +554,7 @@ int mt7921_mcu_uni_add_beacon_offload(struct mt7921_dev *dev,
 #ifdef CONFIG_ACPI
 int mt7921_init_acpi_sar(struct mt7921_dev *dev);
 int mt7921_init_acpi_sar_power(struct mt7921_phy *phy, bool set_default);
+u8 mt7921_acpi_get_flags(struct mt7921_phy *phy);
 #else
 static inline int
 mt7921_init_acpi_sar(struct mt7921_dev *dev)
@@ -566,6 +567,12 @@ mt7921_init_acpi_sar_power(struct mt7921_phy *phy, bool set_default)
 {
 	return 0;
 }
+
+static inline u8
+mt7921_acpi_get_flags(struct mt7921_phy *phy)
+{
+	return 0;
+}
 #endif
 int mt7921_set_tx_sar_pwr(struct ieee80211_hw *hw,
 			  const struct cfg80211_sar_specs *sar);