When "Pre-boot WiFi" is enabled in BIOS, the mt7921e device may not work: mt7921e 0000:02:00.0: ASIC revision: 79220010 mt7921e 0000:02:00.0: Message 00000010 (seq 1) timeout mt7921e 0000:02:00.0: Failed to get patch semaphore mt7921e 0000:02:00.0: Message 00000010 (seq 2) timeout mt7921e 0000:02:00.0: Failed to get patch semaphore mt7921e 0000:02:00.0: Message 00000010 (seq 3) timeout mt7921e 0000:02:00.0: Failed to get patch semaphore mt7921e 0000:02:00.0: Message 00000010 (seq 4) timeout mt7921e 0000:02:00.0: Failed to get patch semaphore mt7921e 0000:02:00.0: Message 00000010 (seq 5) timeout mt7921e 0000:02:00.0: Failed to get patch semaphore mt7921e 0000:02:00.0: Message 00000010 (seq 6) timeout mt7921e 0000:02:00.0: Failed to get patch semaphore mt7921e 0000:02:00.0: Message 00000010 (seq 7) timeout mt7921e 0000:02:00.0: Failed to get patch semaphore mt7921e 0000:02:00.0: Message 00000010 (seq 8) timeout mt7921e 0000:02:00.0: Failed to get patch semaphore mt7921e 0000:02:00.0: Message 00000010 (seq 9) timeout mt7921e 0000:02:00.0: Failed to get patch semaphore mt7921e 0000:02:00.0: Message 00000010 (seq 10) timeout mt7921e 0000:02:00.0: Failed to get patch semaphore mt7921e 0000:02:00.0: hardware init failed After some trials and errors, it shows that PCI function level reset can recover the device back to a functional state. So perform FLR at probe routine to workaround the issue. Signed-off-by: Kai-Heng Feng <kai.heng.feng@xxxxxxxxxxxxx> --- drivers/net/wireless/mediatek/mt76/mt7921/pci.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/pci.c b/drivers/net/wireless/mediatek/mt76/mt7921/pci.c index ddb1fa4ee01d..9671fbe35a8e 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7921/pci.c +++ b/drivers/net/wireless/mediatek/mt76/mt7921/pci.c @@ -262,6 +262,10 @@ static int mt7921_pci_probe(struct pci_dev *pdev, int ret; u16 cmd; + ret = pci_reset_function_locked(pdev); + if (ret) + pci_info(pdev, "Unable to perform FLR\n"); + ret = pcim_enable_device(pdev); if (ret) return ret; -- 2.34.1
