mt76: mt7921s: update mt7921s_wfsys_reset sequence

MT7921S firmware expects driver to clear out the firmware download state
before FW is downloaded again in WiFi reset procedure.
Co-developed-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: YN Chen <YN.Chen@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

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

@@ -454,6 +454,9 @@
 
 #define MT_DMASHDL_SCHED_SET(_n)	MT_DMA_SHDL(0x070 + ((_n) << 2))
 
+#define MT_CONN_STATUS			0x7c053c10
+#define MT_WIFI_PATCH_DL_STATE		BIT(0)
+
 #define MT_CONN_ON_LPCTL		0x7c060010
 #define PCIE_LPCR_HOST_OWN_SYNC		BIT(2)
 #define PCIE_LPCR_HOST_CLR_OWN		BIT(1)

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

@@ -63,6 +63,8 @@ int mt7921s_wfsys_reset(struct mt7921_dev *dev)
 	clear_bit(MT76_STATE_MCU_RUNNING, &dev->mphy.state);
 
 	/* activate mt7921s again */
+	mt7921s_mcu_drv_pmctrl(dev);
+	mt76_clear(dev, MT_CONN_STATUS, MT_WIFI_PATCH_DL_STATE);
 	mt7921s_mcu_fw_pmctrl(dev);
 	mt7921s_mcu_drv_pmctrl(dev);