[PATCH v2] wifi: mt76: mt7921e: fix random fw download fail

[Deren Wu]

From: Deren Wu <deren.wu at mediatek.com>

In case of PCIe interoperability problem shows up, the firmware
payload may be corrupted in download stage. Turn off L0s to keep
fw download process accurately.

[ 1093.528363] mt7921e 0000:3b:00.0: Message 00000007 (seq 7) timeout
[ 1093.528414] mt7921e 0000:3b:00.0: Failed to start patch
[ 1096.600156] mt7921e 0000:3b:00.0: Message 00000010 (seq 8) timeout
[ 1096.600207] mt7921e 0000:3b:00.0: Failed to release patch semaphore
[ 1097.699031] mt7921e 0000:3b:00.0: Timeout for driver own
[ 1098.758427] mt7921e 0000:3b:00.0: Timeout for driver own
[ 1099.834408] mt7921e 0000:3b:00.0: Timeout for driver own
[ 1100.915264] mt7921e 0000:3b:00.0: Timeout for driver own
[ 1101.990625] mt7921e 0000:3b:00.0: Timeout for driver own
[ 1103.077587] mt7921e 0000:3b:00.0: Timeout for driver own
[ 1104.173258] mt7921e 0000:3b:00.0: Timeout for driver own
[ 1105.248466] mt7921e 0000:3b:00.0: Timeout for driver own
[ 1106.336969] mt7921e 0000:3b:00.0: Timeout for driver own
[ 1106.397542] mt7921e 0000:3b:00.0: hardware init failed

Cc: stable at vger.kernel.org
Fixes: bf3747ae2e25 ("mt76: mt7921: enable aspm by default")
Signed-off-by: Deren Wu <deren.wu at mediatek.com>
---
v2: fix typo in commit message
---
 drivers/net/wireless/mediatek/mt76/mt7921/pci.c     | 1 +
 drivers/net/wireless/mediatek/mt76/mt7921/pci_mcu.c | 2 ++
 drivers/net/wireless/mediatek/mt76/mt7921/regs.h    | 2 ++
 3 files changed, 5 insertions(+)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/pci.c b/drivers/net/wireless/mediatek/mt76/mt7921/pci.c
index 9d1ba838e54f..43a8deeb17df 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/pci.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/pci.c
@@ -148,6 +148,7 @@ static u32 __mt7921_reg_addr(struct mt7921_dev *dev, u32 addr)
 		{ 0x820c8000, 0x0c000, 0x02000 }, /* WF_UMAC_TOP (PSE) */
 		{ 0x820cc000, 0x0e000, 0x01000 }, /* WF_UMAC_TOP (PP) */
 		{ 0x820cd000, 0x0f000, 0x01000 }, /* WF_MDP_TOP */
+		{ 0x74030000, 0x10000, 0x10000 }, /* PCIE_MAC_IREG */
 		{ 0x820ce000, 0x21c00, 0x00200 }, /* WF_LMAC_TOP (WF_SEC) */
 		{ 0x820cf000, 0x22000, 0x01000 }, /* WF_LMAC_TOP (WF_PF) */
 		{ 0x820e0000, 0x20000, 0x00400 }, /* WF_LMAC_TOP BN0 (WF_CFG) */
diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/pci_mcu.c b/drivers/net/wireless/mediatek/mt76/mt7921/pci_mcu.c
index 5efda694fb9d..19facf31e4e1 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/pci_mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/pci_mcu.c
@@ -59,6 +59,8 @@ int mt7921e_mcu_init(struct mt7921_dev *dev)
 	if (err)
 		return err;
 
+	mt76_rmw_field(dev, MT_PCIE_MAC_PM, MT_PCIE_MAC_PM_L0S_DIS, 1);
+
 	err = mt7921_run_firmware(dev);
 
 	mt76_queue_tx_cleanup(dev, dev->mt76.q_mcu[MT_MCUQ_FWDL], false);
diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/regs.h b/drivers/net/wireless/mediatek/mt76/mt7921/regs.h
index ea643260ceb6..c65582acfa55 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/regs.h
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/regs.h
@@ -440,6 +440,8 @@
 #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)
+#define MT_PCIE_MAC_PM			MT_PCIE_MAC(0x194)
+#define MT_PCIE_MAC_PM_L0S_DIS		BIT(8)
 
 #define MT_DMA_SHDL(ofs)		(0x7c026000 + (ofs))
 #define MT_DMASHDL_SW_CONTROL		MT_DMA_SHDL(0x004)
-- 
2.18.0