> 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.lore...@kernel.org> From: Lorenzo Bianconi <lore...@kernel.org> Date: Thu, 18 Jun 2020 13:10:11 +0200 Subject: [PATCH] mt76: mt76x2: fix pci suspend Signed-off-by: Lorenzo Bianconi <lore...@kernel.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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