[PATCH v2] wifi: mt76: mt7921e: Set memory space enable in PCI_COMMAND if unset

From: Mario Limonciello
Date: Mon Apr 17 2023 - 14:11:54 EST


When the BIOS has been configured for Fast Boot, systems with mt7921e
have non-functional wifi. Turning on Fast boot caused both bus master
enable and memory space enable bits in PCI_COMMAND not to get configured.

The mt7921 driver already sets bus master enable, but explicitly check
and set memory access enable as well to fix this problem.

Tested-by: Anson Tsao <anson.tsao@xxxxxxx>
Signed-off-by: Mario Limonciello <mario.limonciello@xxxxxxx>
Acked-by: Sean Wang <sean.wang@xxxxxxxxxxxx>
---
v1->v2:
* Pick up tag from Sean
drivers/net/wireless/mediatek/mt76/mt7921/pci.c | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/pci.c b/drivers/net/wireless/mediatek/mt76/mt7921/pci.c
index 5c23c827abe47..41be108e1d5a1 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/pci.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/pci.c
@@ -263,6 +263,7 @@ static int mt7921_pci_probe(struct pci_dev *pdev,
struct mt76_dev *mdev;
u8 features;
int ret;
+ u16 cmd;

ret = pcim_enable_device(pdev);
if (ret)
@@ -272,6 +273,11 @@ static int mt7921_pci_probe(struct pci_dev *pdev,
if (ret)
return ret;

+ pci_read_config_word(pdev, PCI_COMMAND, &cmd);
+ if (!(cmd & PCI_COMMAND_MEMORY)) {
+ cmd |= PCI_COMMAND_MEMORY;
+ pci_write_config_word(pdev, PCI_COMMAND, cmd);
+ }
pci_set_master(pdev);

ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES);
--
2.25.1