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Date: Thu, 18 Jun 2020 13:18:59 +0200
From: Lorenzo Bianconi <lorenzo@...nel.org>
To: Oleksandr Natalenko <oleksandr@...hat.com>
Cc: Lorenzo Bianconi <lorenzo.bianconi83@...il.com>,
Felix Fietkau <nbd@....name>,
Ryder Lee <ryder.lee@...iatek.com>,
Kalle Valo <kvalo@...eaurora.org>,
"David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
Matthias Brugger <matthias.bgg@...il.com>,
linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: mt7612 suspend/resume issue
> Hello, Lorenzo et al.
Hi Oleksandr,
>
> I'm using MT7612 mini-PCIE cards as both AP in a home server and as a client in
> a laptop. The AP works perfectly (after some fixing from your side; thanks for
> that!), and so does the client modulo it has issues during system resume.
>
[...]
>
> The Wi-Fi becomes unusable from this point. If I `modprobe -r` the "mt76x2e" module
> after this splat, the system hangs completely.
>
> If the system resumes fine, the resume itself takes quite some time (more than
> 10 seconds).
>
> I've found a workaround for this, though. It seems the system behaves fine if I
> do `modprobe -r mt76x2e` before it goes to sleep, and then `modprobe mt76x2e`
> after resume. Also, the resume time improves greatly.
>
> I cannot say if it is some regression or not. I've installed the card
> just recently, and used it with v5.7 kernel series only.
>
> Do you have any idea what could go wrong and how to approach the issue?
I have not reproduced the issue myself yet, but I guess we can try:
1- update to latest Felix's tree [1]
2- could you please try to apply the patch below? (compile-test only)
Regards,
Lorenzo
[1] https://github.com/nbd168/wireless
From 400268a0ee5843cf736308504dfbd2f20a291eaf Mon Sep 17 00:00:00 2001
Message-Id: <400268a0ee5843cf736308504dfbd2f20a291eaf.1592478809.git.lorenzo@...nel.org>
From: Lorenzo Bianconi <lorenzo@...nel.org>
Date: Thu, 18 Jun 2020 13:10:11 +0200
Subject: [PATCH] mt76: mt76x2: fix pci suspend
Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
---
.../net/wireless/mediatek/mt76/mt76x02_dma.h | 1 +
.../net/wireless/mediatek/mt76/mt76x02_mmio.c | 15 +++++
.../net/wireless/mediatek/mt76/mt76x2/pci.c | 58 +++++++++++++++++++
3 files changed, 74 insertions(+)
diff --git a/drivers/net/wireless/mediatek/mt76/mt76x02_dma.h b/drivers/net/wireless/mediatek/mt76/mt76x02_dma.h
index 4aff4f8e87b6..6262f2ecded5 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76x02_dma.h
+++ b/drivers/net/wireless/mediatek/mt76/mt76x02_dma.h
@@ -62,5 +62,6 @@ mt76x02_wait_for_wpdma(struct mt76_dev *dev, int timeout)
int mt76x02_dma_init(struct mt76x02_dev *dev);
void mt76x02_dma_disable(struct mt76x02_dev *dev);
void mt76x02_dma_cleanup(struct mt76x02_dev *dev);
+void mt76x02_dma_reset(struct mt76x02_dev *dev);
#endif /* __MT76x02_DMA_H */
diff --git a/drivers/net/wireless/mediatek/mt76/mt76x02_mmio.c b/drivers/net/wireless/mediatek/mt76/mt76x02_mmio.c
index cbbe986655fe..e2631c964331 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76x02_mmio.c
+++ b/drivers/net/wireless/mediatek/mt76/mt76x02_mmio.c
@@ -348,6 +348,21 @@ void mt76x02_dma_disable(struct mt76x02_dev *dev)
}
EXPORT_SYMBOL_GPL(mt76x02_dma_disable);
+void mt76x02_dma_reset(struct mt76x02_dev *dev)
+{
+ int i;
+
+ mt76x02_dma_disable(dev);
+ usleep_range(1000, 2000);
+
+ for (i = 0; i < __MT_TXQ_MAX; i++)
+ mt76_queue_tx_cleanup(dev, i, true);
+ mt76_for_each_q_rx(&dev->mt76, i)
+ mt76_queue_rx_reset(dev, i);
+
+ mt76x02_dma_enable(dev);
+}
+
void mt76x02_mac_start(struct mt76x02_dev *dev)
{
mt76x02_mac_reset_counters(dev);
diff --git a/drivers/net/wireless/mediatek/mt76/mt76x2/pci.c b/drivers/net/wireless/mediatek/mt76/mt76x2/pci.c
index 53ca0cedf026..5543e242fb9b 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76x2/pci.c
+++ b/drivers/net/wireless/mediatek/mt76/mt76x2/pci.c
@@ -103,6 +103,60 @@ mt76pci_remove(struct pci_dev *pdev)
mt76_free_device(mdev);
}
+static int __maybe_unused
+mt76x2e_suspend(struct pci_dev *pdev, pm_message_t state)
+{
+ struct mt76_dev *mdev = pci_get_drvdata(pdev);
+ struct mt76x02_dev *dev = container_of(mdev, struct mt76x02_dev, mt76);
+ int i, err;
+
+ napi_disable(&mdev->tx_napi);
+ tasklet_kill(&mdev->pre_tbtt_tasklet);
+ tasklet_kill(&mdev->tx_tasklet);
+
+ mt76_for_each_q_rx(mdev, i)
+ napi_disable(&mdev->napi[i]);
+
+ mt76x02_dma_reset(dev);
+
+ pci_enable_wake(pdev, pci_choose_state(pdev, state), true);
+ pci_save_state(pdev);
+ err = pci_set_power_state(pdev, pci_choose_state(pdev, state));
+ if (err)
+ goto restore;
+
+ return 0;
+
+restore:
+ mt76_for_each_q_rx(mdev, i)
+ napi_enable(&mdev->napi[i]);
+ napi_enable(&mdev->tx_napi);
+
+ return err;
+}
+
+static int __maybe_unused
+mt76x2e_resume(struct pci_dev *pdev)
+{
+ struct mt76_dev *mdev = pci_get_drvdata(pdev);
+ int i, err;
+
+ err = pci_set_power_state(pdev, PCI_D0);
+ if (err)
+ return err;
+
+ pci_restore_state(pdev);
+
+ mt76_for_each_q_rx(mdev, i) {
+ napi_enable(&mdev->napi[i]);
+ napi_schedule(&mdev->napi[i]);
+ }
+ napi_enable(&mdev->tx_napi);
+ napi_schedule(&mdev->tx_napi);
+
+ return 0;
+}
+
MODULE_DEVICE_TABLE(pci, mt76pci_device_table);
MODULE_FIRMWARE(MT7662_FIRMWARE);
MODULE_FIRMWARE(MT7662_ROM_PATCH);
@@ -113,6 +167,10 @@ static struct pci_driver mt76pci_driver = {
.id_table = mt76pci_device_table,
.probe = mt76pci_probe,
.remove = mt76pci_remove,
+#ifdef CONFIG_PM
+ .suspend = mt76x2e_suspend,
+ .resume = mt76x2e_resume,
+#endif /* CONFIG_PM */
};
module_pci_driver(mt76pci_driver);
--
2.26.2
>
> Thanks.
>
> --
> Best regards,
> Oleksandr Natalenko (post-factum)
> Principal Software Maintenance Engineer
>
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