wifi: mt76: mt7921: introduce mt7920 PCIe support

mt7920e is a mt7921 series chipset with 802.11ax 2x2:2SS support.
The major difference is in firmware side only, at this moment.
This patch would add some mandatory changes for new chip id and
firmware download control.
Signed-off-by: Deren Wu <deren.wu@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt76_connac.h

@@ -177,6 +177,11 @@ static inline bool is_mt7925(struct mt76_dev *dev)
 	return mt76_chip(dev) == 0x7925;
 }
 
+static inline bool is_mt7920(struct mt76_dev *dev)
+{
+	return mt76_chip(dev) == 0x7920;
+}
+
 static inline bool is_mt7922(struct mt76_dev *dev)
 {
 	return mt76_chip(dev) == 0x7922;
@@ -184,7 +189,7 @@ static inline bool is_mt7922(struct mt76_dev *dev)
 
 static inline bool is_mt7921(struct mt76_dev *dev)
 {
-	return mt76_chip(dev) == 0x7961 || is_mt7922(dev);
+	return mt76_chip(dev) == 0x7961 || is_mt7922(dev) || is_mt7920(dev);
 }
 
 static inline bool is_mt7663(struct mt76_dev *dev)
@@ -259,6 +264,7 @@ static inline bool is_mt76_fw_txp(struct mt76_dev *dev)
 {
 	switch (mt76_chip(dev)) {
 	case 0x7961:
+	case 0x7920:
 	case 0x7922:
 	case 0x7925:
 	case 0x7663:

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

@@ -24,6 +24,8 @@ static const struct pci_device_id mt7921_pci_device_table[] = {
 		.driver_data = (kernel_ulong_t)MT7921_FIRMWARE_WM },
 	{ PCI_DEVICE(PCI_VENDOR_ID_MEDIATEK, 0x0616),
 		.driver_data = (kernel_ulong_t)MT7922_FIRMWARE_WM },
+	{ PCI_DEVICE(PCI_VENDOR_ID_MEDIATEK, 0x7920),
+		.driver_data = (kernel_ulong_t)MT7920_FIRMWARE_WM },
 	{ },
 };
 
@@ -269,9 +271,9 @@ static int mt7921_pci_probe(struct pci_dev *pdev,
 	struct mt76_bus_ops *bus_ops;
 	struct mt792x_dev *dev;
 	struct mt76_dev *mdev;
+	u16 cmd, chipid;
 	u8 features;
 	int ret;
-	u16 cmd;
 
 	ret = pcim_enable_device(pdev);
 	if (ret)
@@ -345,7 +347,10 @@ static int mt7921_pci_probe(struct pci_dev *pdev,
 	if (ret)
 		goto err_free_dev;
 
-	mdev->rev = (mt7921_l1_rr(dev, MT_HW_CHIPID) << 16) |
+	chipid = mt7921_l1_rr(dev, MT_HW_CHIPID);
+	if (chipid == 0x7961 && (mt7921_l1_rr(dev, MT_HW_BOUND) & BIT(7)))
+		chipid = 0x7920;
+	mdev->rev = (chipid << 16) |
 		    (mt7921_l1_rr(dev, MT_HW_REV) & 0xff);
 	dev_info(mdev->dev, "ASIC revision: %04x\n", mdev->rev);
 
@@ -551,6 +556,8 @@ static struct pci_driver mt7921_pci_driver = {
 module_pci_driver(mt7921_pci_driver);
 
 MODULE_DEVICE_TABLE(pci, mt7921_pci_device_table);
+MODULE_FIRMWARE(MT7920_FIRMWARE_WM);
+MODULE_FIRMWARE(MT7920_ROM_PATCH);
 MODULE_FIRMWARE(MT7921_FIRMWARE_WM);
 MODULE_FIRMWARE(MT7921_ROM_PATCH);
 MODULE_FIRMWARE(MT7922_FIRMWARE_WM);

drivers/net/wireless/mediatek/mt76/mt792x.h

@@ -36,10 +36,12 @@
 #define MT792x_MCU_INIT_RETRY_COUNT	10
 #define MT792x_WFSYS_INIT_RETRY_COUNT	2
 
+#define MT7920_FIRMWARE_WM	"mediatek/WIFI_RAM_CODE_MT7961_1a.bin"
 #define MT7921_FIRMWARE_WM	"mediatek/WIFI_RAM_CODE_MT7961_1.bin"
 #define MT7922_FIRMWARE_WM	"mediatek/WIFI_RAM_CODE_MT7922_1.bin"
 #define MT7925_FIRMWARE_WM	"mediatek/mt7925/WIFI_RAM_CODE_MT7925_1_1.bin"
 
+#define MT7920_ROM_PATCH	"mediatek/WIFI_MT7961_patch_mcu_1a_2_hdr.bin"
 #define MT7921_ROM_PATCH	"mediatek/WIFI_MT7961_patch_mcu_1_2_hdr.bin"
 #define MT7922_ROM_PATCH	"mediatek/WIFI_MT7922_patch_mcu_1_1_hdr.bin"
 #define MT7925_ROM_PATCH	"mediatek/mt7925/WIFI_MT7925_PATCH_MCU_1_1_hdr.bin"
@@ -326,6 +328,8 @@ int mt792x_mcu_fw_pmctrl(struct mt792x_dev *dev);
 static inline char *mt792x_ram_name(struct mt792x_dev *dev)
 {
 	switch (mt76_chip(&dev->mt76)) {
+	case 0x7920:
+		return MT7920_FIRMWARE_WM;
 	case 0x7922:
 		return MT7922_FIRMWARE_WM;
 	case 0x7925:
@@ -338,6 +342,8 @@ static inline char *mt792x_ram_name(struct mt792x_dev *dev)
 static inline char *mt792x_patch_name(struct mt792x_dev *dev)
 {
 	switch (mt76_chip(&dev->mt76)) {
+	case 0x7920:
+		return MT7920_ROM_PATCH;
 	case 0x7922:
 		return MT7922_ROM_PATCH;
 	case 0x7925: