From 5bcc0ffeeddd52684091e5b77a06ddcec3cdaff5 Mon Sep 17 00:00:00 2001
From: Mario Limonciello <mario.limonciello@amd.com>
Date: Wed, 29 Mar 2023 14:57:58 -0500
Subject: [PATCH] wifi: mt76: mt7921e: Set memory space enable in PCI_COMMAND
if unset
commit 09d4d6da1b65d09414e7bce61459593f3c80ead1 upstream.
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@amd.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Acked-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
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 5c23c827abe4..41be108e1d5a 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);
--
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