linux-kernel - [PATCH RESEND] wifi: mt76: mt7921e: Set memory space enable in PCI

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Message-ID: <20230329195758.7384-1-mario.limonciello@amd.com>
Date:   Wed, 29 Mar 2023 14:57:58 -0500
From:   Mario Limonciello <mario.limonciello@....com>
To:     <nbd@....name>, <lorenzo@...nel.org>, <ryder.lee@...iatek.com>,
        <shayne.chen@...iatek.com>, <sean.wang@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>
CC:     Mario Limonciello <mario.limonciello@....com>,
        Anson Tsao <anson.tsao@....com>, Kalle Valo <kvalo@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        <linux-wireless@...r.kernel.org>, <netdev@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH RESEND] wifi: mt76: mt7921e: Set memory space enable in PCI_COMMAND if unset

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@....com>
Signed-off-by: Mario Limonciello <mario.limonciello@....com>
---
Original patch was submitted ~3 weeks ago with no comments.
Link: https://lore.kernel.org/all/20230310170002.200-1-mario.limonciello@amd.com/
---
 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 cb72ded37256..aa1a427b16c2 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);
-- 
2.34.1