linux-kernel - [PATCH 5.12 519/677] mt76: mt7921: fix suspend/resume sequence

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Date:   Wed, 12 May 2021 16:49:25 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Sean Wang <sean.wang@...iatek.com>,
        Lorenzo Bianconi <lorenzo@...nel.org>,
        Felix Fietkau <nbd@....name>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.12 519/677] mt76: mt7921: fix suspend/resume sequence

From: Sean Wang <sean.wang@...iatek.com>

[ Upstream commit 5e30931494b4940ba74fa5796ca0b6d7e4c84e88 ]

Any pcie access should happen in pci D0 state and we should give ownership
back to the device at the end of the suspend procedure.

Fixes: 1d8efc741df80 ("mt76: mt7921: introduce Runtime PM support")
Signed-off-by: Sean Wang <sean.wang@...iatek.com>
Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
Signed-off-by: Felix Fietkau <nbd@....name>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/wireless/mediatek/mt76/mt7921/pci.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/pci.c b/drivers/net/wireless/mediatek/mt76/mt7921/pci.c
index 5570b4a50531..c747022f7642 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/pci.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/pci.c
@@ -209,12 +209,12 @@ static int mt7921_pci_suspend(struct pci_dev *pdev, pm_message_t state)
 	/* disable interrupt */
 	mt76_wr(dev, MT_WFDMA0_HOST_INT_ENA, 0);
 
-	pci_save_state(pdev);
-	err = pci_set_power_state(pdev, pci_choose_state(pdev, state));
+	err = mt7921_mcu_fw_pmctrl(dev);
 	if (err)
 		goto restore;
 
-	err = mt7921_mcu_drv_pmctrl(dev);
+	pci_save_state(pdev);
+	err = pci_set_power_state(pdev, pci_choose_state(pdev, state));
 	if (err)
 		goto restore;
 
@@ -237,16 +237,16 @@ static int mt7921_pci_resume(struct pci_dev *pdev)
 	struct mt7921_dev *dev = container_of(mdev, struct mt7921_dev, mt76);
 	int i, err;
 
-	err = mt7921_mcu_fw_pmctrl(dev);
-	if (err < 0)
-		return err;
-
 	err = pci_set_power_state(pdev, PCI_D0);
 	if (err)
 		return err;
 
 	pci_restore_state(pdev);
 
+	err = mt7921_mcu_drv_pmctrl(dev);
+	if (err < 0)
+		return err;
+
 	/* enable interrupt */
 	mt7921_l1_wr(dev, MT_PCIE_MAC_INT_ENABLE, 0xff);
 	mt7921_irq_enable(dev, MT_INT_RX_DONE_ALL | MT_INT_TX_DONE_ALL |
-- 
2.30.2