[PATCH 6.8 241/715] wifi: mt76: mt7925: add flow to avoid chip bt function fail

Sasha Levin
2024-03-24T22:38:55Z

From: Quan Zhou <quan.zhou@mediatek.com>

[ Upstream commit 9300ae0cd9e8f2407b20e0e67ee3ea03dc8b06af ]

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: c948b5da6bbe ("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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/wireless/mediatek/mt76/mt7925/pci.c | 2 ++
drivers/net/wireless/mediatek/mt76/mt792x_regs.h | 3 +++
2 files changed, 5 insertions(+)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7925/pci.c b/drivers/net/wireless/mediatek/mt76/mt7925/pci.c
index 1fd99a8565415..74cfba7675beb 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7925/pci.c
+++ b/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;
diff --git a/drivers/net/wireless/mediatek/mt76/mt792x_regs.h b/drivers/net/wireless/mediatek/mt76/mt792x_regs.h
index a99af23e4b564..d7f9b24cd665f 100644
--- a/drivers/net/wireless/mediatek/mt76/mt792x_regs.h
+++ b/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)
--
2.43.0