wifi: mt76: mt7925: add flow to avoid chip bt function fail

A sub-process of Wifi L0.5 reset will make chip common partition
enter low power, and have chance lead to Bluetooth host-to-chip
command timeout, modify the software flow according to the chip's
design to solve the problem.

Fixes: c948b5da ("wifi: mt76: mt7925: add Mediatek Wi-Fi7 driver for mt7925 chips")
Signed-off-by: Quan Zhou <quan.zhou@mediatek.com>
Signed-off-by: Ming Yen Hsieh <mingyen.hsieh@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt7925/pci.c

@@ -386,6 +386,8 @@ static int mt7925_pci_probe(struct pci_dev *pdev,
 
 	dev_info(mdev->dev, "ASIC revision: %04x\n", mdev->rev);
 
+	mt76_rmw_field(dev, MT_HW_EMI_CTL, MT_HW_EMI_CTL_SLPPROT_EN, 1);
+
 	ret = mt792x_wfsys_reset(dev);
 	if (ret)
 		goto err_free_dev;

drivers/net/wireless/mediatek/mt76/mt792x_regs.h

@@ -389,6 +389,9 @@
 #define MT_HW_CHIPID			0x70010200
 #define MT_HW_REV			0x70010204
 
+#define MT_HW_EMI_CTL			0x18011100
+#define MT_HW_EMI_CTL_SLPPROT_EN	BIT(1)
+
 #define MT_PCIE_MAC_BASE		0x10000
 #define MT_PCIE_MAC(ofs)		(MT_PCIE_MAC_BASE + (ofs))
 #define MT_PCIE_MAC_INT_ENABLE		MT_PCIE_MAC(0x188)