This is a note to let you know that I've just added the patch titled
wifi: mt76: mt7921e: Set memory space enable in PCI_COMMAND if unset
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
wifi-mt76-mt7921e-set-memory-space-enable-in-pci_command-if-unset.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 09d4d6da1b65d09414e7bce61459593f3c80ead1 Mon Sep 17 00:00:00 2001
From: Mario Limonciello <mario.limonciello@xxxxxxx>
Date: Wed, 29 Mar 2023 14:57:58 -0500
Subject: wifi: mt76: mt7921e: Set memory space enable in PCI_COMMAND if unset
From: Mario Limonciello <mario.limonciello@xxxxxxx>
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@xxxxxxx>
Signed-off-by: Mario Limonciello <mario.limonciello@xxxxxxx>
Acked-by: Sean Wang <sean.wang@xxxxxxxxxxxx>
Signed-off-by: Felix Fietkau <nbd@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/wireless/mediatek/mt76/mt7921/pci.c | 6 ++++++
1 file changed, 6 insertions(+)
--- a/drivers/net/wireless/mediatek/mt76/mt7921/pci.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/pci.c
@@ -218,6 +218,7 @@ static int mt7921_pci_probe(struct pci_d
struct mt7921_dev *dev;
struct mt76_dev *mdev;
int ret;
+ u16 cmd;
ret = pcim_enable_device(pdev);
if (ret)
@@ -227,6 +228,11 @@ static int mt7921_pci_probe(struct pci_d
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);
Patches currently in stable-queue which might be from mario.limonciello@xxxxxxx are
queue-5.15/wifi-mt76-mt7921e-set-memory-space-enable-in-pci_command-if-unset.patch
